# Undecylenoyl phenylalanine Page: https://lovi.care/skincare/au/ingredients/undecylenoyl-phenylalanine The Lovi Fit is the same in every country; only the stores and prices differ, and the ones here are for Australia. This page shows undecylenoyl phenylalanine products with a Lovi page. For every product, and a routine built for your skin, use the Lovi app. ### Popular undecylenoyl phenylalanine products - [SK-II Genoptics Ultraura Essence](https://lovi.care/skincare/au/p/sk-ii/genoptics-ultraura-essence/for/acne-prone-skin) — Superior fit — [A$667.47 at Amazon](https://www.amazon.com.au/dp/B0C6CQK75L?tag=lovi-care-web-product-22&linkCode=osi&th=1&psc=1) ## Questions and answers ### What does undecylenoyl phenylalanine do for the skin? Undecylenoyl phenylalanine helps significantly lighten skin hyperpigmentation, melasma lesions, and solar lentigines. It may achieve visible improvement within 8 to 12 weeks of topical use. [Journal of Cosmetic Dermatology, 2009](https://pubmed.ncbi.nlm.nih.gov/19958429/) ### How do you use undecylenoyl phenylalanine? Undecylenoyl phenylalanine is applied topically to help lighten hyperpigmentation, melasma, and solar lentigines. Studies show that it may be used consistently over periods such as 8 to 12 weeks to achieve significant skin brightening. [Journal of Cosmetic Dermatology, 2009](https://pubmed.ncbi.nlm.nih.gov/19958429/) ### Should you use undecylenoyl phenylalanine in the morning or at night? Undecylenoyl phenylalanine can be used in your routine as studies generally apply topical treatments over weeks for hyperpigmentation. [Journal of Cosmetic Dermatology, 2009](https://pubmed.ncbi.nlm.nih.gov/19958429/) ### Can you use undecylenoyl phenylalanine every day? Yes, you can use undecylenoyl phenylalanine daily as studies typically apply topical preparations over several weeks to help fade hyperpigmentation and melasma. [Journal of Cosmetic Dermatology, 2009](https://pubmed.ncbi.nlm.nih.gov/19958429/) ### Does undecylenoyl phenylalanine cause purging or irritation? Undecylenoyl phenylalanine is unlikely to cause purging and typically shows minimal side-effects when applied topically to lighten hyperpigmentation. [Clinical and Experimental Dermatology, 2010](https://pubmed.ncbi.nlm.nih.gov/19874316/) ### Which skin types is undecylenoyl phenylalanine best for? Undecylenoyl phenylalanine helps brighten dark spots and hyperpigmentation for skin dealing with melasma, solar lentigines, or uneven tone, and it is found in products like SK-II Genoptics Ultraura Essence. [Journal of Cosmetic Dermatology, 2009](https://pubmed.ncbi.nlm.nih.gov/19958429/) ## Research on undecylenoyl phenylalanine - [Reduction in the appearance of facial hyperpigmentation by topical N-undecyl-10-enoyl-L-phenylalanine and its combination with niacinamide](https://pubmed.ncbi.nlm.nih.gov/19958429/) Undecylenoyl phenylalanine · Journal of Cosmetic Dermatology, 2009 - [A randomized, double-blind, vehicle-controlled study of a preparation containing undecylenoyl phenylalanine 2% in the treatment of solar lentigines](https://pubmed.ncbi.nlm.nih.gov/19874316/) Undecylenoyl phenylalanine · Clinical and Experimental Dermatology, 2010 ## Brands with undecylenoyl phenylalanine - Japanese skincare: [SK-II](https://lovi.care/skincare/au/brands/sk-ii) ## About the Lovi Fit Lovi: Unbiased, science-based skincare AI trained on real user outcomes. Lovi checks every ingredient with brand-independent rules its dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update. Levels from best to worst: Superior, High, Average, Low, Caution, Warning. Behind this ingredient guide: Nadia Kapleva, MS (Co-founder, Medical Director); Alexey Shagraev, PhD (Co-founder, CEO and CTO); Dr. Sofía Perea Pérez, MD, MSc (Medical Board); Aishani Shah, MD (Medical Board); Asya Zubkova, MS (Medical Board); Hanna Kurets, MD (Medical Board, Medical Advisor); Elina Nazarenko, MD (Medical Board); Victoria Derkova, MS (Medical Board). Page built Nov 8, 2026. More from Lovi: https://lovi.care/skincare/llms.txt ## This page in other countries - United States: https://lovi.care/skincare/ingredients/undecylenoyl-phenylalanine - United Kingdom: https://lovi.care/skincare/uk/ingredients/undecylenoyl-phenylalanine - Ireland: https://lovi.care/skincare/ie/ingredients/undecylenoyl-phenylalanine - Germany: https://lovi.care/skincare/de/ingredients/undecylenoyl-phenylalanine - France: https://lovi.care/skincare/fr/ingredients/undecylenoyl-phenylalanine - Italy: https://lovi.care/skincare/it/ingredients/undecylenoyl-phenylalanine - Netherlands: https://lovi.care/skincare/nl/ingredients/undecylenoyl-phenylalanine - Spain: https://lovi.care/skincare/es/ingredients/undecylenoyl-phenylalanine - Canada: https://lovi.care/skincare/ca/ingredients/undecylenoyl-phenylalanine - Australia: https://lovi.care/skincare/au/ingredients/undecylenoyl-phenylalanine (this page) - Singapore: https://lovi.care/skincare/sg/ingredients/undecylenoyl-phenylalanine - Saudi Arabia: https://lovi.care/skincare/sa/ingredients/undecylenoyl-phenylalanine - United Arab Emirates: https://lovi.care/skincare/ae/ingredients/undecylenoyl-phenylalanine