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 The Ordinary Aha 30% + Bha 2% Peeling Solution (Old Version) NIOD Sanskrit Saponins Alkemie Snow White Wake-Up Shot FEMMUE Lumière Vital C Minon Amino Moist Mask NIOD Superoxide Dismutase Saccharide Mist Neostrata Ultra Smoothing Lotion Nu Skin Galvanic Spa Facial Treatment Gel With Ageloc Purito Pure Vitamin C Serum Ausceuticals Peptide Moisturiser BELLAMONSTER Stress Out Solution Pad COSRX Bha Blackhead Power Liquid 4% 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) Kiku-masamune Sake Emulsion Kikumasamune Skin Care Essence PACKage Everyday Bouncy Sheet Mask Pyunkang Yul Essence Toner Pyunkang Yul Toner Essence The Ordinary Amino Acids + B5 The Ordinary Marine Hyaluronics BE THE SKIN Botanical Nutrition Power Toner COSRX One Step Pimple Clear Pad COSRX Two In One Poreless Power Liquid Faith in Nature Rose & Neroli Nourish & Repair Conditioner Hylamide Hydra-Density Mist Leaders Insolution Mediu Amino Pore-Tight Mask Leaders Mediu Amino Mousture Mask M3 Naturals Vitamin C Serum Missha Airy Fit Sheet Mask (Honey) Missha Airy Fit Sheet Mask (Pomegranate) Missha Airy Fit Sheet Mask (Rice) Purito Galacto Niacin 97 Power Essence Rohto Skin Aqua Super Moisture Gel Pump (Spf50 + Pa ++++) The Body Shop Roots Of Strength Firming Shaping Essence Lotion