Acetyl hexapeptide-3 in a cosmetic formulation acts on skin mechanical properties - Clinical study

Abstract

Acetyl hexapeptide-3 has been used in anti-aging topical formulations aimed at improving skin appearance. However, few basic studies address its effects on epidermis and dermis, when vehiculated in topical formulations. Thus, the objective of this study was to determine the clinical efficacy of acetyl hexapeptide-3 using biophysical techniques. For this purpose, formulations with and without acetyl hexapeptide-3 were applied to the ventral forearm and the face area of forty female volunteers. Skin conditions were evaluated after 2 and 4-week long daily applications, by analyzing the stratum corneum water content and the skin mechanical properties, using three instruments, the Corneometer® CM 825, Cutometer®SEM 575 and Reviscometer®RV600. All formulations tested increased the stratum corneum water content in the face region, which remained constant until the end of the study. In contrast, only formulations containing acetyl hexapeptide-3 exhibit a significant effect on mechanical properties, by decreasing the anisotropy of the face skin. No significant effects were observed in viscoelasticity parameters. In conclusion, the effects of acetyl hexapeptide-3 on the anisotropy of face skin characterize the compound as an effective ingredient for improving conditions of the cutaneous tissue, when used in anti-aging cosmetic formulations. © 2015, Faculdade de Ciencias Farmaceuticas (Biblioteca). All rights reserved.

Full text

*Correspondence: Patrícia M.B.G. Maia Campos. Faculdade de Ciên-
cias Farmacêuticas de Ribeirão Preto. Universidade de São Paulo. Av. do
Café, s/n, - Monte Alegre, 14040-903 - Ribeirão Preto, SP, Brazil. E-mail:
pmcampos@usp.br
Article
Brazilian Journal of
Pharmaceutical Sciences
vol. 51, n. 4, oct./dec., 2015
http://dx.doi.org/10.1590/S1984-82502015000400016
Acetyl hexapeptide-3 in a cosmetic formulation acts on skin
mechanical properties - clinical study
Kassandra Azevedo Tadini, Daiane Garcia Mercurio, Patrícia Maria Berardo Gonçalves Maia
Campos
*
Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
Acetyl hexapeptide-3 has been used in anti-aging topical formulations aimed at improving skin
appearance. However, few basic studies address its eects on epidermis and dermis, when vehiculated
in topical formulations. Thus, the objective of this study was to determine the clinical ecacy of acetyl
hexapeptide-3 using biophysical techniques. For this purpose, formulations with and without acetyl
hexapeptide-3 were applied to the ventral forearm and the face area of forty female volunteers. Skin
conditions were evaluated after 2 and 4-week long daily applications, by analyzing the stratum corneum
water content and the skin mechanical properties, using three instruments, the Corneometer® CM 825,
Cutometer

SEM 575 and Reviscometer

RV600. All formulations tested increased the stratum corneum
water content in the face region, which remained constant until the end of the study. In contrast, only
formulations containing acetyl hexapeptide-3 exhibit a signicant eect on mechanical properties,
by decreasing the anisotropy of the face skin. No signicant eects were observed in viscoelasticity
parameters. In conclusion, the eects of acetyl hexapeptide-3 on the anisotropy of face skin characterize
the compound as an eective ingredient for improving conditions of the cutaneous tissue, when used in
anti-aging cosmetic formulations.
Uniterms: Acetyl hexapeptide-3/use in cosmetic formulations. Acetyl hexapeptide-3/clinical ecacy.
Biophysical techniques. Anti-aging/cosmetics. Clinical ecacy. Cosmetics.
Acetil hexapeptídeo-3 tem sido utilizado como um ingrediente ativo em formulações tópicas
antienvelhecimento para a melhoria da aparência cutânea. No entanto, poucos estudos avaliam seus efeitos
na epiderme e derme, quando veiculado em formulações tópicas. Portanto, o objetivo desse estudo foi
a determinação da ecácia clínica de acetil hexapeptídeo-3 utilizando técnicas de biofísica e de análise
de imagem. Para tal, formulações contendo, ou não, acetil hexapeptídeo-3 foram aplicadas no antebraço
volar e na face de voluntárias. As condições cutâneas foram avaliadas após duas e quatro semanas de
aplicação diária das formulações, por meio da análise no conteúdo aquoso do estrato córneo e avaliação
das propriedades mecânicas da pele, utilizando os equipamentos Corneometer® CM 825, Cutometer

SEM
575 e Reviscometer

RV600. Todas as formulações avaliadas aumentaram o conteúdo aquoso do estrato
córneo na face, o qual permaneceu constante até o m do estudo. Por outro lado, somente as formulações
contendo acetil hexapeptídeo-3 apresentaram efeito signicativo nas propriedades mecânicas, por meio
da diminuição da anisotropia da pele na face. Não foram observados efeitos signicativos para os
parâmetros de viscoelasticidade. Em conclusão, os efeitos de acetil hexapeptídeo-3 na pele caracteriza
este peptídeo como um ingrediente ativo efetivo para a melhoria das condições cutâneas, quando utilizadas
em formulações cosméticas.
Unitermos: Acetil hexapeptídeo-3/uso em cosméticos. Acetil hexapeptídeo-3/eficácia clínica.
Antienvelhecimento/cosméticos. Cosméticos/formulação tópica/avaliação. Formulações tópicas/
antiidade.

K. A. Tadini, D. G. Mercurio, P. M. B. G. M. Campos
902
INTRODUCTION
In recent decades, cosmetic formulations have been
developed and employed in the treatment or prevention
of skin changes resulting from aging, such as loss of
elasticity, dryness, formation of wrinkles and spots, thus,
possible delaying invasive procedures such as plastic
surgery. In this context, substances with anti-aging action
have been proposed to delay the appearance of wrinkles
or leaving them less visible. However, due to the high
turnover in the cosmetic area, active substances and their
cosmetic products are constantly available to commercial
purposes without basic studies on the action mechanisms
supporting their benets (Hermanns-Lê et al., 2001).
The advances in the area of skin biology, such as the
mechanisms involved in cell renewal, in skin aging and
in the action of neuroendocrine receptors, have increased
peptide importance. The skin is a neuroendocrine immune
organ in which many different molecules operate in
an autocrine-paracrine manner to guarantee tissue
homeostatsis in physiological and pathophysiological
condition (Sivilia et al., 2008; Takema et al., 1994). Due to
their chemical structure, peptides may act in the hydration,
skin protection and homeostasis, keeping cutaneous tissue
healthy and with a young appearance.
On the other hand, the search in the dermatology area
for non-toxic molecules that mimic the action of botulinum
neurotoxin, has identified acetyl hexapeptide-3 in a
rational design program. An in vitro study demonstrated
that acetyl hexapeptide-3 inhibits neurotransmitter release
with a potency similar to that of botulinum neurotoxin,
although as expected, it displayed much lower ecacy
than the neurotoxin (Sivilia et al., 2008; Blanes-Mira et
al., 2002).
However, there are few hardcore data about the
eects of acetyl hexapeptíde-3 on epidermis and dermis,
when vehiculated in topical formulations, under actual
conditions of use, mainly using objective measurements,
which are an important tool in clinical ecacy studies.
It should be considered that knowledge about the
use of the acetyl hexapeptide-3 is just beginning and
much remains to be learned. Thus, it is very important to
elucidate the eects and prove the ecacy of this active
ingredient, which is commonly used to improve the skin
conditions because of the proposed antiaging activity. So,
clinical objective studies to assess acetyl hexapeptide-3
efficacy in the skin should rely on non-invasive skin
biophysical techniques, which are often used to evaluate
cosmetic products under actual conditions of use in human
skin (Haftek et al., 2008; Paye et al., 2007; Uhoda et al.,
2002).
Furthermore, the results should contribute to a
better understanding of the acetyl hexapeptide-3 eects
by three biophysical techniques, Corneometer® CM 825,
Cutometer

SEM 575 and Reviscometer

RV600, in terms
of skin hydration, skin elasticity and viscoelasticity, and
skin anisotropy, showing that the peptide is clinically
ecient and also that its use is very important in cosmetic
formulations, due to its antiaging eects.
In this context, the aim of this study was to determine
the real benets of acetyl hexapeptide-3 on human skin, by
analyzing the eects of a cosmetic formulation containing
this active substance in terms of stratum corneum water
content and skin mechanical properties.
MATERIAL AND METHODS
Test formulations
The vehicle formulation tested contained 3.5%
(w/w) C12-20 acid PEG-8 ester, 0.7% (w/w), acrylate
polymer, 2.5% (w/w) octyl octanoate, 2.0% (w/w)
propylene glycol, 2.0% (w/w) glycerin, 2.0% (w/w)
dimethicone DC 200/50CS, 7.5% (w/w) blend of
UVA/UVB sunscreen (fenilbenzimidazol sulfonic
acid, benzophenone-4) and 0.8% (w/w) blend of
parabens and phenoxyethanol, Phenonip

(Nipa Labs,
Wilmington, USA). The formulations were supplemented
or not with Argireline

(solution containing 0.05%
acetyl hexapeptide-3) to a concentration of 10%. Acetyl
hexapeptide-3 was kindly provided by Galena Química e
Farmacêutica Ltda, Campinas, Brazil.
Study protocol
The study was approved by the Faculty of
Pharmaceutical Sciences of Ribeirão Preto - USP Ethics
Committee (CEP/FCFRP 60/2005).
Forty healthy female subjects 35-55 years old having
skin Fitzpatrick types II, III and IV participated in this
study after having given their written informed consent.
Exclusion criteria were the presence of any dermatitis and/
or other skin or allergic disease and smoking. Volunteers
were instructed not to apply any topical products to the test
sites for 2 weeks before and during the study. The subjects
were allowed to wash normally, but not to use other skin
care products on their arms and face. They were asked to
avoid getting a sun tan, although the formulations applied
had sunscreens in their composition to avoid the eects of
daily exposure to UV radiation.
Prior to all measurements, subjects remained in
the room for at least 30 minutes in order to allow full

Acetyl hexapeptide-3 in a cosmetic formulation acts on skin mechanical properties - clinical study
903
skin adaptation to room temperature (20 ± 2 ºC) and
humidity (45-60%). Applications sites were randomized
in order to minimize anatomic functional bias. The
hydration index was assessed using measurements
of capacitance (Corneometer

CM825; Courage &
Khazaka, Koeln, Germany) and the skin elasticity and
viscoelasticity by cutometry (Cutometer

SEM 575;
Courage & Khazaka) and by resonance running time
measurements (Reviscometer

RV600; Courage &
Khazaka). The skin properties were examined using a
standardized study protocol.
After the baseline measurements, the subjects were
instructed to apply 1.0 mL of the formulations with acetyl
hexapeptide-3 on the ventral region of one forearm and
the vehicle on the other forearm, twice daily. Half the
subjects applied the 1.0 mL of formulation containing
acetyl hexapeptide-3 on the full face and the other half,
the vehicle. Measurements on forearms and cheeks were
carried out 2 and 4 weeks after daily application, 10-15
hours after the last treatment. For the last measurement,
the formulations were applied in the evening and the
measurements were taken in the following day (Savica
et al., 2004).
Specifically, the experiment was conducted with
twenty volunteers who were divided in two groups:
Group 1: application of the vehicle in the left
forearm and in the face, and vehicle supplemented with
acetyl hexapeptide-3 in the right forearm.
Group 2: application of the vehicle supplemented
with acetyl hexapeptide-3 in the left forearm and in the
face, and of the vehicle in the right forearm.
Instrumentation
The stratum corneum water content was determined
with a non-invasive, skin capacitance meter (Corneometer
®
CM 825, Courage & Khazaka, Germany). The averaged
values of twenty measurements were used for subsequent
calculations (Dal’Belo, Gaspar, Maia Campos, 2006;
Fluhr, Gloor, Lazzerini, 1999; Fluhr et al., 1999).
Mechanical properties of the skin were determined
using two instruments, the Cutometer

SEM 575 (Courage
& Khazaka, Germany) and Reviscometer

RV600 (Courage
& Khazaka, Germany).
The measurement with Cutometer

SEM 575
consisted of five consecutive cycles of a 2 s suction
application period followed by a 2 s relaxation period.
The suction load was 450 mbars. The method analyzed the
following mechanical parameters: Ua/Uf, the ratio of total
retraction to total distension, called gross elasticity; Ur/Ue,
net-elasticity of the skin without viscous deformation; Uv/
Ue, the ratio of viscoelastic to elastic distension and Ur/
Uf, the ratio of immediate retraction to total distension,
called biological elasticity (Dobrev, 2000; Dobrev, 2002).
The Reviscometer
®
RV600 is an equipment based
on resonance running time measurements (RRTM) of
acoustical shockwaves (Takema et al., 1994; Hermanns-
Lê et al. 2001; Ruvolo ; Stamatas ; Kollias, 2007). RRTM
measurements were taken in precise directions, according
to Uhoda et al.(2002), analyzing the medium RRTM, the
lowest and highest RRTM (RRTM max and RRTM min).
The anisotropy dened as the ratio between RRTM max
and RRTM min was calculated (Stamatas, Kollias, 2007).
Statistical analysis
Anisotropy calculated values were statistically
analysed using the Kruskal-Wallis test. The other data
showing a Gaussian distribution were evaluated by the
ANOVA test. The values obtained by the vehicle and
formulation with acetyl hexapeptide-3 after 4 weeks were
statistically analysed using Mann- Whitney test for non-
parametric distribution, and unpaired t- test for parametric
distribution. Dierences were accepted as statistically
signicant at p < 0.05.
RESULTS AND DISCUSSION
Acetyl hexapeptide-3 has been used in anti-aging
topical formulations due to its effects in improving
the skin appearance (Blanes-Mira et al., 2002; Zhang,
Falla, 2009). However there are few basic studies about
its effects on skin, as well as, about its mechanism
of action. In the present investigation, the efficacy
of dermocosmetic formulations containing acetyl
hexapeptide-3 was evaluated using biophysical techniques
and the capacity of two instruments, the Cutometer

SEM
575 and Reviscometer

RV600, to identify skin changes
was compared.
Cutometer

SEM 575 is a non-invasive skin-
elasticity meter that consists of a microprocessor-regulated
pneumatic system that applies suction via a 2-mm circular
opening in the handheld probe. Evaluation is based on
measurements of skin deformation in response to suction.
The Reviscometer
®
RV600 is a device equipped
with a probe containing two needle-like sensors. When
placed on the skin, one needle transmits ultrasound
shockwaves and the other is the recipient. The time needed
by waves to go from the transmitter to the recipient is the
measured RRTM parameter expressed in arbitrary units.
The resonance running time measurements (RRTM) of
acoustical shockwaves propagates differently through

K. A. Tadini, D. G. Mercurio, P. M. B. G. M. Campos
904
the skin according to the state of the elastic bers and its
moisture content (Takema et al., 1994; Hermanns-Lê et
al. 2001; Ruvolo, Stamatas, Kollias, 2007).
Age-related cutaneous changes, such as wrinkles and
skin laxity, are especially prominent on the facial skin, so
several studies have used this site to evaluate the ecacy
of cosmetic products (Takema et al., 1994; Sommerfeld,
2007). On the other hand, the ventral forearm, which
has limited exposure to sunlight and is an easier site for
measurements, has also been used to evaluate changes
characterizing chronological aging (Sumino et al., 2004).
In this study, both regions were used to evaluate the eects
of formulations with acetyl hexapeptide-3.
Four weeks after applying formulations on the
forearm skin, the stratum corneum water content showed
an increasing tendency, not statistically signicant, when
compared to the baseline values (Figure 1) (p > 0.05).
On the other hand, formulations with and without acetyl
hexapeptide-3 increased water content of the stratum
corneum in the face region (p < 0.01), which remained
constant until the end of the study (4 weeks) (Figure 1).
Thus, vehicle only also increased the stratum corneum
water content to appropriate levels of hydration in a normal
skin. These results are in line with previous data obtained
by this research group, when peptide-containing emulsions
were applied on the volunteers forearm skin once, and after
a 4-week period the emulsion with or without peptides
caused an enhanced skin hydration (Anconi, Campos,
2008). Skin hydration is an important parameter to
evaluate the ecacy of a substance. Moisturizing products
may prevent skin alterations resulting from aging and may
be used as support in the treatment of several skin diseases
(Rawlings, Harding, 2004).
Corneometer
®
CM 825 is a device which determines
the water content of supercial epidermal layers down to a
depth of about 0.1 mm and expresses the values obtained
in arbitrary units (Dal’Belo, Gaspar, Maia Campos, 2006;
Fluhr, Gloor, Lazzerini, 1999; Fluhr et al., 1999). Our
results showed that acetyl hexapeptide-3 did not increase
stratum corneum water content, compared to the vehicle.
The vehicle formulation is composed by emollients
that can act on superficial moisturizing and acetyl
hexapeptide-3 may eectively contribute to hydration of
deeper layers of epidermis, which is not measured by this
technique.
In the study of mechanical properties, we compared
the ability of two instruments, the Reviscometer
®
RVM600
and the Cutometer
®
SEM 575, to detect skin surface
mechanical changes.
Data on shear wave propagation, obtained by the
Reviscometer, are shown in Figures 2 to 5 and indicate
that acetyl hexapeptide-3 exhibits a signicant eect by
decreasing the anisotropy property of face skin. Compared
to the vehicle, this reduction was also signicant on the
face after 4 weeks (Figure 5B). Such a nding suggests
increased firmness or tensor effect, since the speed of
shear wave propagation on the skin surface is directly
proportional to its stiness (Ruvolo, Stamatas, Kollias,
2007; Vexler, Polyansky, Gorodetsky, 1999). In rigid
skin the time for wave spreading will be short, anisotropy
and RRTM values smaller (Nizet, Pierard-Franchimont,
Pierard, 2001; Verhaegen et al., 2010).
Ruvolo, Stamatas and Kollias (2007)
and Hermanns-
Lê et al. (2001) observed that while the minimum RRTM
values remained fairly constant for the different age
groups, the maximum RRTM values increased with age.
FIGURE 1 - Skin stratum corneum water content before and after a 2 and 4-week long application of test formulations (vehicle,
vehicle + acetyl hexapeptide-3) on the forearm (A) and face area (B) of volunteers. AHP: acetyl hexapeptide-3. *Signicantly
dierent from the baseline values (p<0.01).

Acetyl hexapeptide-3 in a cosmetic formulation acts on skin mechanical properties - clinical study
905
FIGURE 2 - Maximum RRTM before and after a 2 and 4-week long application of test formulations (vehicle, vehicle + acetyl
hexapeptide-3) on the forearm (A) and face area (B) of volunteers. AHP: acetyl hexapeptide-3.
FIGURE 3 - Minimum RRTM before and after a 2 and 4-week long application of the test formulations (vehicle, vehicle + acetyl
hexapeptide-3) on the forearm (A) and face area (B) of volunteers. AHP: acetyl hexapeptide-3.
FIGURE 4 - Medium RRTM before and after a 2 and 4-week long application of the test formulations (vehicle, vehicle + acetyl
hexapeptide-3) on the forearm (A) and face area (B) of volunteers. AHP: acetyl hexapeptide-3.

K. A. Tadini, D. G. Mercurio, P. M. B. G. M. Campos
906
Thus, anisotropy is dened as the ratio between maximum
and minimum RRTMs and will also increase with age.
In contrast, in this study, the mean, maximum and
minimum RRTM did not show alterations after treatment
with formulations tested, meaning that they were less
discriminatory between formulations when compared with
anisotropy values.
It is concluded that acetyl hexapeptide-3 is an
effective anti-aging compound as already mentioned
by Blanes-Mira et al. (2002). The author, using silicone
replicas, observed that topical application of an emulsion
containing the peptide attenuated the depth of wrinkles
in the periocular region after 30 days of treatment, when
compared with the vehicle.
Unlike the results on the face region, formulations
applied on the forearm did not cause any significant
change in the skin anisotropy, suggesting that the eects
of the cosmetic formulations in the two regions studied
are dierent, the same as occurred in the determination of
stratum corneum water content. This is due to the fact that
face and forearm skin have quite dierent characteristics.
The face is more vulnerable to photoaging than the forearms
and more susceptible to the action of antiaging products
(Blinchmann, Serup, 1988). According to Blinchmann and
Serup (1988) and Rogiers (1990), variations in the skin
characteristics in dierent regions of the body may also be
related to dierences in the stratum corneum thickness and
the number and activity of sebaceous glands.
Skin elasticity parameters were not significantly
altered, after a 4-week period of daily application of
formulations on both skin regions (Figures 6 and 7)
as indicated by the lack of changes in the Cutometer
®
-
measured elasticity index. Thus, it is possible to conclude
that the Reviscometer was better qualified to detect
statistically significant effects of acetyl hexapeptide-3
than the Cutometer. Paye et al. (2007)
also noted that
Reviscometer is able to better discriminate different
treatments than the Cutometer, in a study involving
induced slight xerotic skin conditions.
In a previous retinoids ecacy study of our research
group we observed that dermocosmetic formulations
containing retinoic acid altered the skin anisotropy after a
4-week period of daily applications, but these formulations
did not alter the cutometer parameters. However, after
a 8-week period of daily application, it was possible to
detect alterations not only in skin anisotropy but also in
cutometer parameters (Ua/Uf - the ratio of total retraction
to total distension and Ur/Uf - the ratio of immediate
retraction to total distension) (unpublished data). These
observations suggest that significant changes in skin
elasticity may occur later or these changes have to attain
a certain level to be detected by the Cutometer .
Finally, it is necessary to consider that loss of
skin elasticity is one of the main problems of aging
and this is a mechanical property inuenced by elastin,
which together with collagen and glycosaminoglycans
make up the connective tissue. As a large number of
events cause cutaneous aging
(Rieger, 1996), the use
of active ingredients that are able to induce alterations
in skin mechanical properties is a valid option for the
improvement of skin conditions. In this context, the eects
of acetyl hexapeptide-3 on the anisotropy of face skin,
FIGURE 5 - Anisotropy (RRTM
maximum
/ RRTM
minimum
) before and after a 2 and 4-week long application of the test formulations
(vehicle, vehicle + acetyl hexapeptide-3) on the forearm (A) and face area (B) of volunteers. AHP: acetyl hexapeptide-3.
*Signicantly dierent from baseline values; ● Signicantly dierent from Vehicle after 4 weeks using the formulations.

Acetyl hexapeptide-3 in a cosmetic formulation acts on skin mechanical properties - clinical study
907
characterizes the compound as an eective ingredient for
improving conditions of the cutaneous tissue, when used
in anti-aging cosmetic formulations.
CONCLUSIONS
In this study, acetyl hexapeptide-3 was found to
be an eective ingredient for use in anti-aging cosmetic
formulations due to its reduction of the anisotropy of face
skin and probable action on its mechanical properties.
This way, it can be used in cosmetic formulations to
prevent skin alterations, premature aging and improve
skin conditions.
DISCLOSURES
On behalf of all authors, the corresponding author
states that there is no conflict of interest. The authors
gratefully acknowledge the nancial support of São Paulo
Research Foundation (FAPESP).
REFERENCES
ANCONI, G.L.; CAMPOS, P.M.B.G.M. Stability and clinical
efficacy of cosmetic formulations containing different
peptides. In: IFSCC CONGRESS, 25., 2008. Barcelona:
Luton: IFSCC, 2008.
FIGURE 6 - Skin elasticity (Uv/Ue: ratio of delayed distension to immediate distension ) before and after a 2 and 4-week long
application of the test formulations (vehicle, vehicle + acetyl hexapeptide-3) on the forearm (A) and face area (B) of volunteers.
AHP: acetyl hexapeptide-3.
FIGURE 7 - Skin elasticity (Ur/Uf - ratio of immediate retraction to total distension) before and after a 2 and 4-week long application
of the test formulations (vehicle, vehicle + acetyl hexapeptide-3) on the forearm (A) and face area (B) of volunteers. AHP: acetyl
hexapeptide-3.

K. A. Tadini, D. G. Mercurio, P. M. B. G. M. Campos
908
BLANES-MIRA, C.; CLEMENTE, J.; JODAS, G.; GIL,
A.; FERNÁNDEZ-BALLESTER, G.; PONSATI,
B.; GUTIERREZ, L.; PÉREZ-PAYÁ, E.; FERRER-
MONTIEL, A. A synthetic hexapeptide (Argireline) with
antiwrinkle activity. Int. J. Cosmet. Sci., v.24, n.5, p.303-
310, 2002.
BLINCHMAN, C.W.; SERUP, J. Assessment of skin moisture:
measurement of electrical conductance, capacitance and
transepidermal water loss. Acta Derm. Venereol., v.68, n.4,
p.284-290, 1988.
DAL’BELO S.E.; GASPAR, L.R.; MAIA CAMPOS P.M.B.G.
Moisturizing eect of cosmetic formulations containing
Aloe vera extract in dierent concentrations assessed by
skin bioengineering techniques. Skin Res. Technol., v.12,
n.4, p.241-246, 2006.
DOBREV, H,P. Use of Cutometer to assess epidermal hydration.
Skin Res. Technol., v.6, p.239-244, 2000.
DOBREV, H.P. A study of human skin mechanical properties
by means of Cutometer. Folia Medica (Plovdiv), v.44, n.3,
p.5-10, 2002.
FLUHR, J.W.; GLOOR, M.; LAZZERINI, S. Comparative
study of five instruments measuring stratum corneum
hydration (Corneometer CM820 and CM825, Skicon200,
Nova DPM9003, DermaLab). Part 1. In vitro. Skin Res.
Technol., v.5, n.3, p.161-170, 1999.
FLUHR, J.W.; GLOOR, M.; LAZZERINI, S.; KLEESZ, P.,
GRIESHABER, R. AND BERARDESCA, E. Comparative
study of five instruments measuring stratum corneum
hydration (Corneometer CM820 and CM825, Skicon200,
Nova DPM9003, DermaLab). Part 2. In vivo. Skin Res.
Technol., v.5, n.3, p.171–178, 1999.
HAFTEK M, MAC-MARY S, LE BITOUX MA, CREIDI P,
SEITÉ S, ROUGIER A, HUMBERT P. Clinical, biometric
and structural evaluation of the long-term effects of a
topical treatment with ascorbic acid and madecassoside in
photoaged human skin. Exp. Dermatol., v.7, n.11, p.946-
952, 2008.
HERMANNS-LÊ, T.; JONLETA, F.; SCHEENB, A.; PIÉRARD
G.E. Age- and body mass index-related changes in
cutaneous shear wave velocity. Exp. Gerontol., v.36, n.2,
p.363-372, 2001.
NIZET, J.L.; PIERARD-FRANCHIMONT, C.; PIERARD, G.E.
Inuence of the body posture and gravitational forces on
shear wave propagation in the skin. Dermatology, v.202,
n.2, p.177-180, 2001.
PAYE M.; MAC-MARY, S.; ELKHYAT, A.; TARRIT, C.;
MERMET, P.; HUMBERT P.H. Use of the Reviscometer
for measuring cosmetics-induced skin surface eects. Skin
Res. Technol., v.13, n.4, p.343-349, 2007.
RAWLINGS, A.V.; HARDING, C.R. Moisturization and skin
barrier function. Dermatol. Ther., v.17, Supl.1, p.43-48,
2004.
RIEGER, M. Ceramides their promise in skin care. Cosm. Toil.,
v.111, p.33-45, 1996.
ROGIERS, V. Standardized conditions needed for skin surface
hydration measurements. Cosm. Toil., v.105, p.76-82, 1990.
RUVOLO, E.C.; STAMATAS, G.N.; KOLLIAS, N. Skin
viscoelasticity displays site- and age- dependent angular
anisotropy. Skin Pharmacol. Physiol., v.20, n.6, p.313-321,
2007.
SAVICA, S.; TAMBURIC, S.; SAVIC, M.; CEKIC, N.; MILIC,
J.; VULETA, G. Vehicle-controlled eect of urea on normal
and SLS-irritated skin. Int. J. Pharm., v.271, n.1-2, p.269-
280, 2004.
SIVILIA, S.; PARADISI, M.; D’INTINO, G.; FERNANDEZ,
M.; PIRONDI, S,; LORENZINI L, CALZA L. Skin
homeostasis during inammation: a role for nerve growth
factor. Histol. Histopathol., v.23, p.1–10, 2008.
SOMMERFELD B. Randomised, placebo-controlled, double-
blind, split-face study on the clinical ecacy of Tricutan on
skin rmness. Phytomedicine, v.14, n.11, p.711-715, 2007.
SUMINO, H.; ICHIKAWA, S.; ABE, M.; ENDO, Y.;
ISHIKAWA, O.; URABAYASHI M. Effects of aging,
menopause and hormone replacement therapy on forearm
skin elasticity in women. J. Am. Geriatr. Soc., v.52, n.6,
p.945-949, 2004.
TAKEMA, Y.; YORIMOTO, Y.; KAWAI, M.; IMOKAWA, G.
Age-related changes in the elastic properties and thickness
of human facial skin. Br. J. Dermatol., v.131, n.5, p.641-
648, 1994.

Acetyl hexapeptide-3 in a cosmetic formulation acts on skin mechanical properties - clinical study
909
UHODA, I.; FASKA, N.; ROBERT, C.; CAUWENBERGH, G.;
PIÉRARD, G.E. Split face study on the cutaneous tensile
eect of 2-dimethylaminoethanol (deanol) gel. Skin Res.
Technol., v.8, n.3, p.164-167, 2002.
VERHAEGEN, P.D.; RES, E.M.; VAN ENGELEN, A.;
MIDDELKOOP. E.; VAN ZUIJLEN P.P. A reliable,non-
invasive measurement tool for anisotropy in normal skin
and scar tissue. Skin Res. Technol., v.16, n.3, p.325-331,
2010.
VEXLER, A.; POLYANSKY, I.; GORODETSKY, R. Evaluation
of skin viscoelasticity and anisotropy by measurement of
speed of shear wave propagation with viscoelasticity skin
analyzer. J. Investig. Dermatol., v.113, n.5, p.732-739,
1999.
ZHANG, L.; FALLA, T.J. Cosmeceuticals and peptides. Clin.
Dermatol., v.27, n.5, p.485-494, 2009.
Received for publication on 20
th
November 2014
Accepted for publication on 02
nd
July 2015