Tripeptide-32

Tripeptide-32 is a synthetic signaling peptide used in anti-aging products, typically at very low concentrations (commonly well under 1%), and it is not pH-dependent or inherently keratolytic. Available clinical/patch-test experience with cosmetic peptides generally shows low rates of stinging or dermatitis compared with acids, retinoids, or fragrance, though occasional reactions can occur from the peptide itself or the formula vehicle. Given the low intrinsic irritancy but non-zero risk in highly reactive/eczema-prone skin, it fits best as very gentle rather than truly inert. Safety Notes: In commercial leave-on anti-aging serums/creams, Tripeptide-32 is typically dosed in the low-ppm to low-hundred-ppm range due to cost and stability, with mass-market products often landing around 0.0001–0.001% (commonly within broader peptide blends). Higher-strength consumer-available “peptide booster” style formulations and premium actives-forward products have been observed/formulated up to ~0.02% to drive a stronger marketing/efficacy claim while remaining workable for preservation and sensory. It is rarely used meaningfully in rinse-off products because of short contact time, so the practical market range is dominated by leave-on applications.