Question 1

What does Palmitoyl Dipeptide-52 do in a cosmetic formula?

Accepted Answer

Palmitoyl Dipeptide-52 is a biomimetic lipopeptide used in hair and scalp care to fight hair greying. Sold by Sederma (Croda) as SILVERFREE, it works on the hair bulb rather than the hair fiber: it re-activates the pigment-making machinery in melanocytes so new growth comes in closer to a person's natural colour, and it shields those pigment cells from oxidative stress. It is water soluble, added cold at the end of a formula, and used at about 1.5% in leave-on lotions, serums and scalp treatments. It is not a dye and not a skin-firming peptide.

Question 2

Is Palmitoyl Dipeptide-52 clean?

Accepted Answer

From a DARE clean-beauty lens this is low concern at use level. It is a synthesised peptide with a palmitic acid tail, used at fractions of a percent active, and it is not on common restricted lists. The usual caveats apply: synthesis is solvent- and purification-intensive, and public safety and environmental datasets are thinner than for simple cosmetic staples.

Question 3

Is Palmitoyl Dipeptide-52 sustainable?

Accepted Answer

Made by peptide synthesis followed by fatty-acid modification, delivered in a hydroglycerin carrier titrated at 6000 ppm. ISO 16128 natural content is 29.4% with natural-origin content of 99.4%. Use levels are low and the molecule is far more degradable than persistent synthetics, but peptide manufacture is resource-intensive and ingredient-specific biodegradation data is limited.

Question 4

Is Palmitoyl Dipeptide-52 COSMOS-approved?

Accepted Answer

Not a straightforward COSMOS-organic material. COSMOS-natural acceptance depends on supplier documentation for feedstock, synthesis route, solvents and residuals. Green Chemistry alignment is partial: renewable fatty-acid input and good expected degradability, offset by a solvent- and purification-intensive peptide synthesis.

Question 5

How does Palmitoyl Dipeptide-52 work chemically?

Accepted Answer

Palmitoyl Dipeptide-52 is palmitoyl-prolyl-proline (Pal-PP), a C16 fatty chain attached to a proline-proline dipeptide; proline is tied to cellular stress response, and the lipid tail improves affinity for the follicle. Mechanistically it drives the full pigmentation cascade rather than a single step. At the gene level it raises CREB expression 46 to 56%, MITF 42%, and TYRP1 42 to 54%. Downstream, tyrosinase activity rises 115 to 175%, melanocyte dendrite length increases 20 to 57%, and melanosome transfer into keratinocytes increases 50 to 283%. In parallel it rebuilds melanocyte antioxidant defence (catalase +31%, glutathione +27.7%, Bcl-2 +64%) and cuts hydrogen-peroxide-induced ROS by 25 to 33%, which matters because peroxide accumulation in the follicle is a recognised driver of greying. Clinically, at 1.5% for three months: white hair density fell 32.4% on average (up to 86% in top responders, 81% respondents), with temple -37.5% and nape -31.9% (p<0.01). Remnant effect was -39.9% three months post-use and -22.2% at four months. Patent family: FR 3 115 209, WO 2022/084255, WO 2014/080376, EP 2 922 864, US 9,534,015.