Mar. Drugs 2014, 12, 128-152; doi:10.3390/md12010128
Astaxanthin: Sources, Extraction, Stability, Biological Activities
and Its Commercial Applications—A Review
Ranga Rao Ambati 1,*, Siew Moi Phang 1, Sarada Ravi 2 and
Ravishankar Gokare Aswathanarayana 3
1 Institute of Ocean and Earth Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia;
2 Plant Cell Biotechnology Department, Central Food Technological Research Institute, (Constituent
Laboratory of Council of Scientific & Industrial Research), Mysore-570020, Karnataka, India;
3 C. D. Sagar Centre for Life Sciences, Dayananda Sagar Institutions, Kumaraswamy Layout,
Bangalore-560078, Karnataka, India; E-Mail: firstname.lastname@example.org
* Author to whom correspondence should be addressed; E-Mail: email@example.com;
Tel.: +603-79674610; Fax: +603-79676994.
Received: 10 October 2013; in revised form: 10 December 2013 / Accepted: 11 December 2013 /
Published: 7 January 2014
Abstract: There is currently much interest in biological active compounds derived from
natural resources, especially compounds that can efficiently act on molecular targets, which
are involved in various diseases. Astaxanthin (3,3′-dihydroxy-β, β′-carotene-4,4′-dione) is a
xanthophyll carotenoid, contained in Haematococcus pluvialis, Chlorella zofingiensis,
Chlorococcum, and Phaffia rhodozyma. It accumulates up to 3.8% on the dry weight basis
in H. pluvialis. Our recent published data on astaxanthin extraction, analysis, stability
studies, and its biological activities results were added to this review paper. Based on our
results and current literature, astaxanthin showed potential biological activity in in vitro
and in vivo models. These studies emphasize the influence of astaxanthin and its beneficial
effects on the metabolism in animals and humans. Bioavailability of astaxanthin in animals
was enhanced after feeding Haematococcus biomass as a source of astaxanthin.
Astaxanthin, used as a nutritional supplement, antioxidant and anticancer agent, prevents
diabetes, cardiovascular diseases, and neurodegenerative disorders, and also stimulates
immunization. Astaxanthin products are used for commercial applications in the dosage
forms as tablets, capsules, syrups, oils, soft gels, creams, biomass and granulated powders.
Astaxanthin patent applications are available in food, feed and nutraceutical applications.
Mar. Drugs 2014, 12 129
The current review provides up-to-date information on astaxanthin sources, extraction,
analysis, stability, biological activities, health benefits and special attention paid to its
Keywords: astaxanthin; sources; stability; biological activities; health
Astaxanthin is a xanthophyll carotenoid which is found in various microorganisms and marine
animals . It is a red fat-soluble pigment which does not have pro-Vitamin A activity in the human
body, although some of the studies reported that astaxanthin has more potent biological activity than
other carotenoids. The United States Food and Drug Administration (USFDA) has approved the use of
astaxanthin as food colorant in animal and fish feed . The European Commission considers natural
astaxanthin as a food dye . Haematococcus pluvialis is a green microalga, which accumulates high
astaxanthin content under stress conditions such as high salinity, nitrogen deficiency, high temperature
and light [4–6]. Astaxanthin produced from H. pluvialis is a main source for human consumption .
It is used as a source of pigment in the feed for salmon, trout and shrimp [1,3]. For dietary supplement
in humans and animals, astaxanthin is obtained from seafood or extracted from H. pluvialis . The
consumption of astaxanthin can prevent or reduce risk of various disorders in humans and
animals [7,8]. The effects of astaxanthin on human health nutrition have been published by various
authors [7–13]. In our previous reviews, we included recent findings on the potential effects of
astaxanthin and its esters on biological activities [14–18]. The use of astaxanthin as a nutritional
supplement has been rapidly growing in foods, feeds, nutraceuticals and pharmaceuticals. This present
review paper provides information on astaxanthin sources, extraction methods, storage stability,
biological activities, and health benefits for the prevention of various diseases and use in
2. Source of Astaxanthin
The natural sources of astaxanthin are algae, yeast, salmon, trout, krill, shrimp and crayfish.
Astaxanthin from various microorganism sources are presented in Table 1. The commercial
astaxanthin is mainly from Phaffia yeast, Haematococcus and through chemical synthesis.
Haematococcus pluvialis is one of the best sources of natural astaxanthin [17–20]. Astaxanthin content
in wild and farmed salmonids are shown in Figure 1. Among the wild salmonids, the maximum
astaxanthin content in wild Oncorhynchus species was reported in the range of 26–38 mg/kg flesh in
sockeye salmon whereas low astaxanthin content was reported in chum . Astaxanthin content in
farmed Atlantic salmon was reported as 6–8 mg/kg flesh. Astaxanthin is available in the European
(6 mg/kg flesh) and Japanese market (25 mg/kg flesh) from large trout. Shrimp, crab and salmon can
serve as dietary sources of astaxanthin . Wild caught salmon is a good source of astaxanthin. In
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order to get 3.6 mg of astaxanthin one can eat 165 grams of salmon per day. Astaxanthin supplement at
3.6 mg per day can be beneficial to health as reported by Iwamoto et al. .
Table 1. Microorganism sources of astaxanthin.
Astaxanthin (%) on the Dry Weight Basis
Haematococcus pluvialis (K-0084)
Haematococcus pluvialis (Local isolation)
Haematococcus pluvialis (AQSE002)
Haematococcus pluvialis (K-0084)
Paracoccus carotinifaciens (NITE SD 00017)
Xanthophyllomyces dendrorhous (JH)
Xanthophyllomyces dendrorhous (VKPM Y2476)
Thraustochytrium sp. CHN-3 (FERM P-18556)
Figure 1. Astaxanthin levels (mg/kg flesh) of wild and farmed (*) salmonids .
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3. Structure of Astaxanthin
Astaxanthin is a member of the xanthophylls, because it contains not only carbon and hydrogen but
also oxygen atoms (Figure 2). Astaxanthin consists of two terminal rings joined by a polyene chain.
This molecule has two asymmetric carbons located at the 3, 3′ positions of the β-ionone ring with
hydroxyl group (-OH) on either end of the molecule. In case one, hydroxyl group reacts with a fatty
acid then it forms mono-ester, whereas when both hydroxyl groups are reacted with fatty acids the
result is termed a di-ester. Astaxanthin exists in stereoisomers, geometric isomers, free and esterified
forms . All of these forms are found in natural sources. The stereoisomers (3S, 3′S) and (3R 3′R) are
the most abundant in nature. Haematococcus biosynthesizes the (3S, 3′S)-isomer whereas yeast
Xanthophyllomyces dendrorhous produces (3R, 3′R)-isomer . Synthetic astaxanthin comprises
isomers of (3S, 3′S) (3R, 3′S) and (3R, 3′R). The primary stereoisomer of astaxanthin found in the
Antarctic krill Euphausia superba is 3R, 3′R which contains mainly esterified form, whereas in wild
Atlantic salmon it is 3S, 3′S which occurs as the free form . The relative percentage of astaxanthin
and its esters in krill, copepod, shrimp and shell is shown in Figure 3. Astaxanthin has the molecular
formula C40H52O4. Its molar mass is 596.84 g/mol.
Figure 2. Planner structure of astaxanthin.
Figure 3. Astaxanthin and its esters from various sources [19,20].
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4. Extraction and Analysis of Astaxanthin
Astaxanthin is a lipophilic compound and can be dissolved in solvents and oils. Solvents, acids,
edible oils, microwave assisted and enzymatic methods are used for astaxanthin extraction.
Astaxanthin is accumulated in encysted cells of Haematococcus. Astaxanthin in Haematococcus was
extracted with different acid treatments, hydrochloric acid giving up to 80% recovery of the
pigment . When encysted cells were treated with 40% acetone at 80 °C for 2 min followed by
kitalase, cellulose, abalone and acetone powder, 70% recovery of astaxanthin was obtained . High
astaxanthin yield was observed with treatment of hydrochloric acid at various temperatures for 15 and
30 min using sonication . In another study, vegetable oils (soyabean, corn, olive and grape seed)
were used to extract astaxanthin from Haematococcus. The culture was mixed with oils, and the
astaxanthin inside the cell was extracted into the oils, with the highest recovery of 93% with olive
oil . Astaxanthin (1.3 mg/g) was extracted from Phaffia rhodozyma under acid conditions .
Microwave assisted extraction at 75 °C for 5 min resulted in 75% of astaxanthin; however, astaxanthin
content was high in acetone extract [43,44]. Astaxanthin yield from Haematococcus was 80%–90%
using supercritical fluid extraction with ethanol and sunflower oil as co-solvent [45–47]. Astaxanthin
was extracted repeatedly with solvents, pooled and evaporated by rotary evaporator, then re-dissolved
in solvent and absorbance of extract was measured at 476–480 nm to estimate the astaxanthin
content . Further the extract can be analyzed for quantification of astaxanthin using high pressure
liquid chromatography and identified by mass spectra .
5. Storage and Stability of Astaxanthin
Astaxanthin stability was assessed in various carriers and storage conditions. Astaxanthin derived
from Haematococcus and its stability in various edible oils was determined . Astaxanthin was
stable at 70–90 °C in ricebran, gingelly and palm oils with 84%–90% of retention of astaxanthin
content which can be used in food, pharmaceutical and nutraceutical applications, whereas astaxanthin
content was reduced at 120 and 150 °C . Astaxanthin nanodispersions’ stability was evaluated in
skimmed milk, orange juice and deionized water was used as a control . It was found that
degradation of astaxanthin was significantly higher in skimmed milk than orange juice. In another
study, stability of astaxanthin biomass was examined after drying and storage at various conditions for
nine weeks . The results showed that degradation of astaxanthin was as low as 10% in biomass
dried at 180/110 °C and stored at −21 °C under nitrogen after nine weeks of storage. The stability of
astaxanthin from Phaffia rhodozyma was studied and it was found that stability was high at pH 4.0 and
at a lower temperature . The storage stability of astaxanthin was enhanced at 4 °C and 25 °C in a
complex mixture of hydroxyproply-β-cyclodextrin and water . Astaxanthin stability was
investigated using microencapsulation with chitosan, polymeric nanospheres, emulsions and
β-cyclodextrin as reported by various authors [53–56].
6. Biochemistry of Astaxanthin
Astaxanthin contains conjugated double bonds, hydroxyl and keto groups. It has both lipophilic and
hydrophilic properties . The red color is due to the conjugated double bonds at the center of the
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compound. This type of conjugated double bond acts as a strong antioxidant by donating the electrons
and reacting with free radicals to convert them to be more stable product and terminate free radical
chain reaction in a wide variety of living organisms . Astaxanthin showed better biological activity
than other antioxidants , because it could link with cell membrane from inside to outside
Figure 4. Superior position of astaxanthin in the cell membrane .
7. Bioavailability and Pharmacokinetics of Astaxanthin
Dietary oils may enhance the absorption of astaxanthin. Astaxanthin with combination of fish oil
promoted hypolipidemic/hypocholesterolemic effects in plasma and its increased phagocytic activity
of activated neutrophils when compared with astaxanthin and fish oil alone . Astaxanthin was
superior to fish oil in particular by improving immune response and lowering the risk of vascular and
infectious diseases. The proliferation activity of T- and B-lymphocytes was diminished followed by
lower levels of O2, H2O2 and NO production, increased antioxidant enzymes superoxide dismutase,
catalase and glutathione peroxidase (GPx), and calcium release in cytosol after administration of
astaxanthin with fish oil . Bioavailability and antioxidant properties of astaxanthin were enhanced
in rat plasma and liver tissues after administration of Haematococcus biomass dispersed in olive
Astaxanthin is a fat soluble compound, with increased absorption when consumed with dietary oils.
Astaxanthin was shown to significantly influence immune function in several in vitro and in vivo
assays [14,15,17]. Lipophilic compounds such as astaxanthin are usually transformed metabolically
before they are excreted, and metabolites of astaxanthin have been detected in various rat tissues .
Astaxanthin bioavailability in human plasma was confirmed with single dosage of 100 mg . Its
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accumulation in humans was found after administration of Haematococcus biomass as source of
astaxanthin . Astaxanthin bioavailability in humans was enhanced by lipid based formulations;
high amounts of carotenes solubilized into the oil phase of the food matrix can lead to greater
bioavailability . A recent study reported that astaxanthin accumulation in rat plasma and liver was
observed after feeding of Haematococcus biomass as source of astaxanthin [14,15,17].
Carotenoids are absorbed into the body like lipids and transported via the lymphatic system into the
liver. The absorption of carotenoids is dependent on the accompanying dietary components. A high
cholesterol diet may increase carotenoid absorption while a low fat diet reduces its absorption.
Astaxanthin mixes with bile acid after ingestion and make micelles in the intestinum tenue. The
micelles with astaxanthin are partially absorbed by intestinal mucosal cells. Intestinal mucosal cells
incorporate astaxanthin into chylomicra. Chylomicra with astaxanthin are digested by lipoprotein
lipase after releasing into the lymph within the systemic circulation, and chylomicron remnants are
rapidly removed by the liver and other tissues. Astaxanthin is assimilated with lipoproteins and
transported into the tissues . Of several naturally occurring carotenoids, astaxanthin is considered
one of the best carotenoids being able to protect cells, lipids and membrane lipoproteins against
8. Biological Activities of Astaxanthin and Its Health Benefits
8.1. Antioxidant Effects
An antioxidant is a molecule which can inhibit oxidation. Oxidative damage is initiated by free
radicals and reactive oxygen species (ROS). These molecules have very high reactivity and are
produced by normal aerobic metabolism in organisms. Excess oxidative molecules may react with
proteins, lipids and DNA through chain reaction, to cause protein and lipid oxidation and DNA
damage which are associated with various disorders. This type of oxidative molecules can be inhibited
by endogenous and exogenous antioxidants such as carotenoids. Carotenoids contain polyene chain,
long conjugated double bonds, which carry out antioxidant activities by quenching singlet oxygen and
scavenging radicals to terminate chain reactions. The biological benefits of carotenoids may be due to
their antioxidant properties attributed to their physical and chemical interactions with cell membranes.
Astaxanthin had higher antioxidant activity when compared to various carotenoids such as lutein,
lycopene, α-carotene and β-carotene reported by Naguib et al. . The antioxidant enzymes catalase,
superoxide dismutase, peroxidase and thiobarbituric acid reactive substances (TBARS) were high in
rat plasma and liver after feeding Haematococcus biomass as source of astaxanthin . Astaxanthin
in H. pluvialis offered the best protection from free radicals in rats followed by β-carotene and
lutein [15,17]. Astaxanthin contains a unique molecular structure in the presence of hydroxyl and keto
moieties on each ionone ring, which are responsible for the high antioxidant properties [10,64].
Antioxidant activity of astaxanthin was 10 times more than zeaxanthin, lutein, canthaxanthin,
β-carotene and 100 times higher than α-tocopherol . The oxo functional group in carotenoids has
higher antioxidant activity without pro-oxidative contribution . The polyene chain in astaxanthin
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traps radicals in the cell membrane, while the terminal ring of astaxanthin could scavenge radicals at
the outer and inner parts of cell membrane (Figure 4). Antioxidant enzyme activities were evaluated in
the serum after astaxanthin was supplemented in the diet of rabbits, showing enhanced activity of
superoxide dismutase and thioredoxin reductase whereas paraoxonase was inhibited in the
oxidative-induced rabbits . Antioxidant enzyme levels were increased when astaxanthin fed to
ethanol-induced gastric ulcer rats .
8.2. Anti-Lipid Peroxidation Activity
Astaxanthin has a unique molecular structure which enables it to stay both in and outside the cell
membrane. It gives better protection than β-carotene and Vitamin C which can be positioned inside the
lipid bilayer. It serves as a safeguard against oxidative damage by various mechanisms, like quenching
of singlet oxygen; scavenging of radicals to prevent chain reactions; preservation of membrane
structure by inhibiting lipid peroxidation; enhancement of immune system function and regulation of
gene expression. Astaxanthin and its esters showed 80% anti-lipid peroxidation activity in ethanol
induced gastric ulcer rats and skin cancer rats [14,68]. Astaxanthin inhibited lipid peroxidation in
biological samples reported by various authors [14,15,17,18,68,69].
Astaxanthin is a potent antioxidant to terminate the induction of inflammation in biological
systems. Astaxanthin acts against inflammation. Algal cell extracts of Haematococcus and
Chlorococcum significantly reduced bacterial load and gastric inflammation in H. pylori-infected
mice [16,70,71]. Park et al.  reported astaxanthin reduced the DNA oxidative damage biomarker
inflammation, thus enhancing immune response in young healthy adult female human subjects.
Haines et al.  reported lowered bronchoalveolar lavage fluid inflammatory cell numbers, and
enhanced cAMP, cGMP levels in lung tissues after feeding astaxanthin with Ginkgo biloba extract and
Vitamin C. Another study showed astaxanthin esters and total carotenoids from Haematococcus
exerted a dose-dependent gastroprotective effect on acute, gastric lesions in ethanol-induced gastric
ulcers in rats. This may be due to inhibition of H1, K1 ATPase, upregulation of mucin content and an
increase in antioxidant activities . Astaxanthin showed protective effect on high glucose induced
oxidative stress, inflammation and apoptosis in proximal tubular epithelial cells. Astaxanthin is a
promising molecule for the treatment of ocular inflammation in eyes as reported by the Japanese
researchers [74,75]. Astaxanthin can prevent skin thickening and reduce collagen reduction against UV
induced skin damage [14,76,77].
8.4. Anti-Diabetic Activity
Generally, oxidative stress levels are very high in diabetes mellitus patients. It is induced by
hyperglycemia, due to the dysfunction of pancreatic β-cells and tissue damage in patients. Astaxanthin
could reduce the oxidative stress caused by hyperglycemia in pancreatic β-cells and also improve
glucose and serum insulin levels . Astaxanthin can protect pancreatic β-cells against glucose
toxicity. It was also shown to be a good immunological agent in the recovery of lymphocyte
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dysfunctions associated with diabetic rats . In another study, ameliorate oxidative stress in
streptozotocin-diabetes rats were inhibited by the combination of astaxanthin with α-tocopherol . It
is also inhibited glycation and glycated protein induced cytotoxicity in human umbilical vein
endothelial cells by preventing lipid/protein oxidation . Improved insulin sensitivity in both
spontaneously hypertensive corpulent rats and mice on high fat plus high fructose diets was observed
after feeding with astaxanthin [82–84]. The urinary albumin level in astaxanthin treated diabetic mice
was significantly lower than the control group . Some of the studies demonstrated that astaxanthin
prevents diabetic nephropathy by reduction of the oxidative stress and renal cell damage [85–87].
8.5. Cardiovascular Disease Prevention
Astaxanthin is a potent antioxidant with anti-inflammatory activity and its effect examined in both
experimental animals and human subjects. Oxidative stress and inflammation are pathophysiological
features of atherosclerotic cardiovascular disease. Astaxanthin is a potential therapeutic agent against
atherosclerotic cardiovascular disease . The efficacy of disodium disuccinate astaxanthin (DDA) in
protecting mycocardium using mycocardial ischemia reperfusion model in animals was evaluated.
Myocardial infarct size was reduced in Sprague Dawley rats, and improved in myocardial salvage in
rabbits after four days of pre-treatment with DDA at 25, 50 and 75 mg/kg body weight [89,90].
Astaxanthin was found in rat mycocardial tissues after pretreatment with DDA at dosage of 150 and
500 mg/kg/day for seven days . Astaxanthin effects on blood pressure in spontaneously
hypertensive rats (SHR), normotensive Wistar Kyoto rats (NWKR) and stroke prone spontaneously
hypertensive rats (SPSHR) were reported . Astaxanthin was found in the plasma, heart, liver,
platelets, and increased basal arterial blood flow in mice fed with astaxanthin derivative . Human
umbilical vien endothelial cells and platelets treated with the astaxanthin showed increased nitric oxide
levels and decrease in peroxynitrite levels . Mice fed 0.08% astaxanthin had higher heart
mitochondrial membrane potential and contractility index compared to the control group .
Astaxanthin effects on paraoxonase, thioredoxin reductase activities, oxidative stress parameters and
lipid profile in hypercholesterolemic rabbits were evaluated. Astaxanthin prevented the activities of
those enzymes from hypercholesterolemia induced protein oxidation at the dosages of 100 mg and
500 mg/100 g .
8.6. Anticancer Activity
The specific antioxidant dose may be helpful for the early detection of various degenerative
disorders. Reactive oxygen species such as superoxide, hydrogen peroxide and hydroxyl radical are
generated in normal aerobic metabolism. Singlet oxygen is generated by photochemical events
whereas peroxyl radicals are produced by lipid peroxidation. These oxidants contribute to aging and
degenerative diseases such as cancer and atherosclerosis through oxidation of DNA, proteins and
lipids . Antioxidant compounds decrease mutagenesis and carcinogenesis by inhibiting oxidative
damage to cells. Cell–cell communication through gap junctions is lacking in human tumors and its
restoration tends to decrease tumor cell proliferation. Gap junctional communication occurs due to an
increase in the connexin-43 protein via upregulation of the connexin-43 gene. Gap junctional
communication was improved in between the cells by natural carotenoids and retinoids .
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Canthaxanthin and astaxanthin derivatives enhanced gap junctional communication between mouse
embryo fibroblasts [97–99]. Increased connexin-43 expression in murine fibroblast cells by β-carotene
was reported [100,101]. Astaxanthin showed significant antitumor activity when compared to other
carotenoids like canthaxanthin and β-carotene [102,103]. It also inhibited the growth of fibrosarcoma,
breast, and prostate cancer cells and embryonic fibroblasts . Increased gap junctional intercellular
communication in primary human skin fibroblasts cells were observed when treated with
astaxanthin . Astaxanthin inhibited cell death, cell proliferation and mammary tumors in
chemically induced male/female rats and mice [105–109]. H. pluvialis extract inhibited the growth of
human colon cancer cells by arresting cell cycle progression and promoting apoptosis reported by
Palozza et al. . Nitroastaxanthin and 15-nitroastaxanthin are the products of astaxanthin with
peroxynitrite, 15-nitroastaxanthin anticancer properties were evaluated in a mouse model. Epstein-Barr
virus and carcinogenesis in mouse skin papillomas were significantly inhibited by astaxanthin
Immune system cells are very sensitive to free radical damage. The cell membrane contains poly
unsaturated fatty acids (PUFA). Antioxidants in particular astaxanthin offer protection against free
radical damage to preserve immune-system defenses. There are reports on astaxanthin and its effect on
immunity in animals under laboratory conditions however clinical research is lacking in humans.
Astaxanthin showed higher immuno-modulating effects in mouse model when compared to
β-carotene . Enhanced antibody production and decreased humoral immune response in older
animals after dietary supplementation of astaxanthin was reported [111,112]. Astaxanthin produced
immunoglobulins in human cells in a laboratory study . Eight week-supplementation of
astaxanthin in humans  resulted in increased blood levels of astaxanthin and improved activity of
natural killer cells which targeted and destroyed cells infected with viruses. In this study, T and B cells
were increased, DNA damage was low, and C-reactive protein (CRP) was significantly lower in the
astaxanthin supplemented group [67,102,114]. Recent reports on astaxanthin biological activities are
presented in Table 2.
Table 2. Astaxanthin biological activities in in vitro and in vivo models.
Protection from UV rays
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9. Safety and Dose of Astaxanthin
Astaxanthin is safe, with no side effects when it is consumed with food. It is lipid soluble,
accumulates in animal tissues after feeding of astaxanthin to rats and no toxic effects were
found [15,17,133]. Excessive astaxanthin consumption leads to yellow to reddish pigmentation of the
skin in animals. Astaxanthin is incorporated into fish feed, resulting in the fish skin becoming reddish
in color. Antioxidant enzymes such as superoxide dismutase, catalase, and glutathione peroxidase
levels significantly increased in rats after oral dosage of astaxanthin [14,15]. A study reported that
blood pressure (bp) was reduced in stroke prone rats and in hypertensive rats by feeding 50 mg/kg
astaxanthin for five weeks and 14 days, respectively . Astaxanthin was also shown significant
protection against naproxen induced gastric, antral ulcer and inhibited lipid peroxidation levels in
gastric mucosa [67,135]. Astaxanthin accumulation in eyes was observed when astaxanthin was fed to
rats . Astaxanthin extracted from Paracoccus carotinifaciens showed potential antioxidant and
also anti-ulcer properties in murine models as reported by Murata et al. . Astaxanthin
bioavailability was increased with supplement of lipid based formulations [14,15,17,138].
Supratherapeutic concentrations of astaxanthin had no adverse effects on platelet, coagulation and
fibrinolytic function . Research has so far reported no significant side effects of astaxanthin
consumption in animals and humans. These results support the safety of astaxanthin for future
It is recommended to administer astaxanthin with omega-3 rich seed oils such as chia, flaxseed,
fish, nutella, walnuts and almonds. The combination of astaxanthin (4–8 mg) with foods, soft gels and
capsules and cream is available in the market. Recommended dose of astaxanthin is 2–4 mg/day. A
study reported that no adverse effects were found with the administration of astaxanthin (6 mg/day) in
adult human subjects . Astaxanthin effects on human blood rheology were investigated in adult
men subjects with a single-blind method after administration of astaxanthin at 6 mg/day for
10 days . Recent studies on astaxanthin dosage effects on human health benefits were presented
in Table 3.
Table 3. Health benefits of astaxanthin in human subjects.
Duration of Experiment
Subjects in Humans
Benefits of Astaxanthin
1.8, 3.6, 14.4 and 21.6
Reduction of LDL oxidation
Middle aged male
Astaxanthin take up by VLDL
0.2 and 8
lowered in CRP levels
Assessed by blood pressure
Improved blood rheology
Decreased oxidation of fatty acids
Age related macular
Improved central retinal
dysfunction in age related macular
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Table 3. Cont.
Improved Cog health battery scores
Improved groton maze learning
8 or 6 weeks
Healthy female or male
Improved skin winkle, corneocyte
layer, epidermis and dermis
Improved superoxide scavenging
activity and lowered hydroperoxides
in the human aqueous humor
LDL, Low-density lipoproteins, VLDL, Very low-density lipoprotein, CRP, C-reactive protein.
10. Commercial Applications of Astaxanthin
In the present scenario, production of astaxanthin from natural sources has become one of the most
successful activities in biotechnology. Astaxanthin has great demand in food, feed, nutraceutical and
pharmaceutical applications. This has promoted major efforts to improve astaxanthin production from
biological sources instead of synthetic ones. According to the current literature, astaxanthin is used in
various commercial applications in the market. Astaxanthin products are available in the form of
capsule, soft gel, tablet, powder, biomass, cream, energy drink, oil and extract in the market (Table 4).
Some of the astaxanthin products were made with combination of other carotenoids, multivitamins,
herbal extracts and omega-3, 6 fatty acids. Patent applications are available on astaxanthin for
preventing bacterial infection, inflammation, vascular failure, cancer, cardiovascular diseases,
inhibiting lipid peroxidation, reducing cell damage and body fat, and improving brain function and
skin thickness (Table 5). Astaxanthin containing microorganisms or animals find many applications in
a wide range of commercial activities, the reason for which astaxanthin enriched microalgae
production can provide more attractive benefits.
Table 4. Astaxanthin products from various companies and its use for various purposes.
2 mg/4 mg-AX
Physician formulas vitamin
AX, vitamin-C, plant
Physician formulas Vitamin
1.5 mg-AX, EPA, DHA
Physician formulas vitamin
6 mg-AX, CX
4 mg AX, 325 mg
Dr. Mercola premium
Solgar global manufacture
AX, herbal extracts
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Table 4. Cont.
8 mg AX, T3
Fuji Chemical Industry
9 mg AX, T3 and zinc
Fuji Chemical Industry
Oil, powder, water
Fuji Chemical Industry
Soft gel, tablet,
Fuji Chemical Industry
Purity and products evidence
based nutritional supplements
Soft gel capsules
2 mg, 4 mg-AX
Micro Algae Super
4 mg AX
Anumed intel biomed
(Information obtained from the respective company websites); AX, astaxanthin, AXE, astaxanthin esters, CX,
canthaxanthin, DHA, docosahexaenoic acid, EPA, eicosapentaenoic acid, ALA, alpha linolenic acid, T3, tocotrienol.
Table 5. Recent patent applications for astaxanthin.
Natural astaxanthin extract reduces DNA oxidation
Reduce endogenous oxidative
Neurocyte protective agent
Crystal forms of astaxanthin
Use of carotenoids and carotenoid derivatives analogs
for reduction/ inhibition of certain negative effects of
Inhibit of lipid peroxidation
Composition for body fat reduction
Inhibits body fat
Carotenoid oxidation products as chemopreventive and
Formulation for oral administration with beneficial
effects on the cardiovascular system
Algal and algal extract dietary supplement composition
Method for improving cognitive performance
Improving brain function
Method of preventing discoloration of carotenoid
pigment and container used therefor
Prevention of discoloration
Pulverulent carotenoid preparation for colouring drinks
Inflammatory disease treatment
Preventing inflammatory disease
Agent for alleviating vascular failure
Preventing vascular failure
Feed additive for improved pigment retention
Carotenoid containing compositions and methods
Preventing bacterial infections
Agent for improving carcass performance in
Composition and method to alleviate joint pain
Reduced joint pain and
symptoms of osteoarthritis
Baked food produced from astaxanthin containing dough
Astaxanthin used in baked food
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The current research data on astaxanthin is encouraging and have resulted from well controlled
trials in in vitro and in vivo models. Astaxanthin showed potential effects on various diseases including
cancers, hypertension, diabetes, cardiovascular, gastrointestinal, liver, neurodegenerative, and skin
diseases. Its antioxidant properties are used against oxidative damage in diseased cells. Recently, our
laboratory isolated and characterized astaxanthin and its esters from Haematococcus and checked their
biological activities in in vitro and in vivo models, confirming that astaxanthin and its esters show
potential biological activities in animal models. However, there is a lack of research on astaxanthin
esters (mono-di) and their metabolic pathways in biological systems. Future research should focus on
effects of astaxanthin esters on various biological activities and their uses in nutraceutical and
pharmaceutical applications. Astaxanthin mono-diesters may increase biological activities better than
the free form which can be easily absorbed into the metabolism. Further research requires to be
investigated on their metabolic pathways and also molecular studies in in vitro and in vivo models for
their use in commercial purposes.
The first author thanks the University of Malaya Research Grant (UMRG RP001i-13SUS),
University of Malaya, Kuala Lumpur, Malaysia for providing financial support for this project.
Conflicts of Interest
The authors declare no conflict of interest.
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