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A semi-essential (infants cannot synthesize it, but adults can) amino acid that is one of the primary building blocks of hair keratin and skin collagen. It's a natural moisturizing factor, a skin hydrator and might also help to speed up wound healing

Arginine usually has a positive charge (cationic) that makes it substantive to skin and hair (those are more negatively charged surfaces) and an excellent film former.  Thanks to the positive charge, it also creates a complex with AHAs (AHAs like to lose a hydrogen ion and be negatively charged, so the positive and the negative ions attract each other) that causes a "time-release AHA effect" and reduces the irritation associated with AHAs

Products with Arginine

Doctor Babor Aha 10+10 Peeling Gel Heliocare 360° Gel Oil-Free Spf 50 Sanzi Beauty Eyelash Growth Serum Evologie Intensive Blemish Serum NIOD Sanskrit Saponins Peter Thomas Roth Unisex Neuroliquid Volufill Youth Serum Watsons Skin Advanced Platinum Anti-Acne & Repairing Treatment Essence Alkemie Snow White Wake-Up Shot FEMMUE Lumière Vital C Kiehl’s Herbal-Infused Micellar Cleansing Water Knours Skin Meditation Gel Cream Maskingdom Aboriginal Taiwan Guava & Black Tea Facial Mask Minon Amino Moist Mask NIOD Superoxide Dismutase Saccharide Mist Neostrata Foaming Glycolic Wash Neostrata Ultra Smoothing Lotion Nu Skin Galvanic Spa Facial Treatment Gel With Ageloc Pixi Hydrating Milky Peel Purito Pure Vitamin C Serum Ausceuticals Peptide Moisturiser BELLAMONSTER Stress Out Solution Pad Brickell Men's Products Daily Strengthening Shampoo For Men COSRX Bha Blackhead Power Liquid 4% Garnier Organic Thyme Toner Grown Alchemist Age-Repair Gel Masque Kiehl’s Cilantro & Orange Extract Pollutant Defending Mask Kikumasamune Sake Brewing Skin Care Lotion High Moist Neostrata Bionic Face Serum 10 Bionic BOSCIA Sake Cleansing Water COSRX Advanced Snail 96 Mucin Power Essence COSRX Ultimate Moisturizing Honey Overnight Mask Etude House Bebe Foot Mask Face Theory Clarifying Cleanser Unscented (C2) Garnier Natural Rose Water Toner Sensitive Skin Holika Holika Honey Sleeping Pack (Acerola) Holika Holika Honey Sleeping Pack (Blueberry) Holika Holika Honey Sleeping Pack (Blueberry) Holika Holika Honey Sleeping Pack (Canola) KIKO Milano Strengthener Base Coat Kiku-masamune Sake Emulsion Kikumasamune Skin Care Essence Merbliss Wedding Dress Emerald Aloe Honey Soothing Clear Seal Sheet Mask Neutrogena Hydro Boost Aqua Pearls Serum (Germany) PACKage Everyday Bouncy Sheet Mask Pyunkang Yul Toner Essence Skinstitut L-Lactic Cleanser The Ordinary Amino Acids + B5 The Ordinary Marine Hyaluronics BE THE SKIN Botanical Nutrition Power Toner COSRX One Step Pimple Clear Pad