A synthetic brightening active. The maker links it to evening skin tone and working on dark spots; independent data are limited. Well tolerated.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
A brightening active. Safe; independent data limited.
Undecylenoyl Phenylalanine is a synthetic active that combines undecylenic acid with the amino acid phenylalanine. It goes into depigmenting formulas with the idea of interfering with the signalling that stimulates melanocytes, which would help even out tone and fade dark spots. On efficacy a caveat is needed. Some brand studies point to improved tone, but independent data are limited. It is a supporting brightening active: reasonable within a routine, useful as a complement to other better-documented brighteners, not a replacement for them. Results, when they come, are gradual. For topical use it is not meaningfully absorbed, so it can be used during pregnancy and breastfeeding without restriction, unlike more problematic brighteners such as hydroquinone. It is well tolerated: irritation and allergy potential are low, with no comedogenicity rating. It suits sensitive skin. As with any spot treatment, it is best paired with daily sun protection so you do not lose the gains.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Undecylenoyl Phenylalanine is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Undecylenoyl Phenylalanine suits: normal, dry, combination, oily, sensitive.
A synthetic brightening active.
The INCI name is Undecylenoyl Phenylalanine. It may also appear as: Ундециленоил фенилаланин, Sepiwhite.
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