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An essential amino acid that's also a key building block of collagen and elastin. When taken orally, it helps the digestive and intestinal tracts function more smoothly and also helps the absorption of nutrients. As for skincare, it is not clear what it does other than being a skin hydrator

Products with Threonine

Peter Thomas Roth Unisex Neuroliquid Volufill Youth Serum Mary Kay Lash & Brow Building Serum Peter Thomas Roth Peptide 21 Amino Acid Exfoliating Peel Pads 24 K Donna Bella Collagen Radiance Renewal Serum Comme Deux Serum Booster Pore Refining & Mattifying Leaders Mediu Amino Mousture Mask Copenhagen Grooming The Activator Dermexcel Acne Repair Serum MEDI-PEEL Aesthe Derma Red Marine Collagen Toner Mira Dror Suero Hidrasystem Natur Vital Coloursafe Black Hair Mask Natur Vital Coloursafe Chesnut Hair Mask Atypical Skincare Glow Tonic Icon Skin 12 Herbs Toner Janssen Cosmetics Clarifying Cleansing Gel Leaders Amino Lifting Mask Milbon Jemile Fran Melty Butter Balm Minon Amino Moist Mask Murad Essential-C Toner Pacifica Cosmic Hemp Balancing Face Wash H20+ Gel Cleanser H20+ Hydration Oasis Refreshing Gel Moisturizer La sciampista Luce Olay Quench Daily Body Lotion Swissvita Skin Regenerating Vital Essence The Ordinary Amino Acids + B5 Ausceuticals Peptide Moisturiser Brickell Men's Products Daily Strengthening Shampoo For Men Eaoron Hyaluronic Cleanser Kikumasamune Skin Care Essence Mario Badescu Revitalin Moisturizer Neutrogena Hydro Boost Aqua Pearls Serum (Germany) Neutrogena Hydro Boost Supercharged Booster Nivea Deo Roll On Antitranspirant Original Care Oséque Silky Bright Enzyme Powder Facial Wash The Ordinary Marine Hyaluronics TheSkinlist__ Hydro Booster Hydrating First Essence bioearth Siero Viso Illuminante Antiossidante the Cocoon Rose Water Toner Dearskin Vitamin C Dear Serum Isntree Sensitive Balancing Thermal Toner Mecca Cosmetica Hydrating Mist Murad Eye Lift Firming Treatment™ Onsen Sento Fresh Start - Depuff & Acne Scar Repair Revolution Skincare Overnight Blemish Lotion Skin Functional Exfoliating Facial 2 30% Amino Hydroxy Complex The Mom's Co. Hair Serum Virtue Labs Refresh Purifying Leave-In Conditioner Dearskin Vitamin C Dear Serum Esho Drench