Phenylalanine
Ingredient Info
Phenylalanine is an amino acid that, in its modified form (undecylenoyl phenylalanine), is used in skincare to help reduce the appearance of dark spots and uneven skin tone, particularly melasma. It works by interfering with melanin production in the skin.
Benefits
- May help reduce the appearance of dark spots and hyperpigmentation
- Potential support for melasma treatment as an adjuvant therapy
- Generally well-tolerated with minimal side effects
Science: Limited clinical evidence exists for topical phenylalanine derivatives in melasma treatment. A 2022 systematic review identified 2% undecylenoyl phenylalanine as a topical agent with less robust evidence compared to gold-standard treatments like hydroquinone and triple combination therapy, though no severe adverse effects were reported.
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