Science
Mechanism of Action
Palmitoyl Tetrapeptide-20 Amide functions as an α-MSH (alpha-melanocyte-stimulating hormone) agonist, activating the Melanocortin-1 Receptor (MC1-R) pathway. This activation drives melanogenesis, leading to increased melanin synthesis within hair follicles and enhancing melanin transfer to keratinocytes, which promotes hair re-pigmentation. Additionally, it boosts the expression and activity of catalase, a crucial antioxidant enzyme, reducing intracellular hydrogen peroxide levels by up to 30%. This action effectively lowers oxidative stress, preserving natural pigmentation. It also upregulates SIRT1 activity, contributing to an even skin tone, reduced hyperpigmentation, and broader anti-aging benefits.
Research
Clinical Evidence
Medium confidence0.001%
Key findings
- 01 Daily application of a lotion containing 0.001% (10 ppm) of this peptide for 3 months significantly improved hair pigmentation in a clinical study involving 15 male volunteers with premature canities, primarily by activating the MC1-R pathway and reducing oxidative stress.
- 02 In ex vivo human hair follicles, treatment with 10^-9 M and 10^-7 M concentrations for 8 days resulted in a 52% and 66% increase in hair pigmentation, respectively.
Transparency
Dusting Analysis
Based on clinical data, a concentration of 0.001% has demonstrated efficacy in improving hair pigmentation. For optimal results in skincare or hair treatments, formulating below this threshold may not yield the desired biological activity for pigmentation modulation or anti-aging benefits.
The Formula
Formulation
Stability
Optimal stability and efficacy are observed within a pH range of 4.5 to 6.5. This ingredient should be incorporated into formulations during the cooling phase, specifically below 40°C, to prevent degradation. While the peptide itself is lipid-soluble, requiring pre-dispersion in oils or suitable solubilizers for even distribution, commercial solutions (e.g., Greyverse™) are often supplied in water/glycerin and can be water-miscible. Long-term storage necessitates refrigeration (2-8°C or 5°C) and protection from light, with stock solutions stored at -20°C or -80°C for shorter periods.
Conflicts
- strong oxidizers (e.g., peroxides)
- sulfates
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed 'Palmitoyl Tetrapeptide-20' as part of a peptide group and concluded it is safe for cosmetic use, provided formulations are non-irritating. It is also noted as 'Irritant Free' and 'Non-Comedogenic'.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This peptide is a valuable active ingredient for both targeted hair re-pigmentation and diverse skincare concerns, including hyperpigmentation and anti-aging, due to its dual action on melanin production and oxidative stress.
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