Key Benefits

• Helps reduce hair shedding and thinning.

• Supports a healthy scalp microbiome.

• Improves hair density by up to +40%.

• Strengthens and nourishes hair from the root.

• Safe for sensitive skin and daily use.

OS-01 HAIR Peptide Scalp Serum is a daily treatment designed to nourish the scalp and support the hair’s natural growth cycle. Powered by the brand’s proprietary OS-01 Senescence Blocking Peptide™, it targets a root cause of hair thinning by helping to reduce the accumulation of ageing cells that disrupt healthy follicle function.

Clinically shown to improve hair density by up to +40% in six months, this lightweight, fragrance-free serum strengthens the scalp barrier and promotes an optimal environment for growth. A blend of Panax Ginseng Root Extract and Biotin helps energise and fortify strands, while Fisetin and Sunflower Sprout Extract protect against oxidative stress. Rice Bran Water, Inulin, and Alpha-Glucan Oligosaccharide help balance the scalp microbiome, reduce dryness, and enhance hydration for healthier, fuller-looking hair.

Dermatologist tested, vegan, non-comedogenic, and safe for sensitive skin, OS-01 HAIR Peptide Scalp Serum is 100% free from fragrance, parabens, sulfates, and other unnecessary additives, giving you a simple, effective way to care for your scalp and support visibly healthier hair every day.

OneSkin’s products harness the power of OS-01, an innovative peptide that tackles skin’s biological age by zeroing in on senescent cells—often referred to as "zombie" cells that speed up the ageing process. As these damaged cells accumulate, they lead to wrinkles, loss of firmness, and thinning skin. The OS-01 peptide works by actively repairing DNA damage in these cells, stopping them from unleashing harmful pro-aging factors that can impact surrounding healthy cells. This groundbreaking approach reduces cellular senescence, effectively lowering the skin’s biological age. It also boosts biomarkers of healthy skin, including collagen and hyaluronic acid biosynthesis to promote a healthier, more youthful skin that stays resilient over time.

Founded by a team of four female PhDs, OneSkin's products focus on skin longevity. At the core of their products is OS-01, the only peptide scientifically proven to reverse skin aging at the molecular level. OneSkin's approach goes beyond aesthetics, focusing on keeping skin healthier and more resilient over time. With rigorous research, peer-reviewed data, and a passion for life, the brand is redefining ageing and empowering individuals to live without limits.

With our Healf Curation Process, we do the work for you. Shop with confidence knowing that every item has been tried, tested, and curated for you.

Learn more about each step—Brand Discovery, Expert Validation, and Community Testing—here.

Water, Glycerin, 1,2-Hexanediol, Butylene Glycol, Hydroxyacetophenone, Panthenol, Inulin, Helianthus Annuus (Sunflower) Sprout Extract, Cellulose Gum, Alpha-Glucan Oligosaccharide, Tetrasodium Glutamate Diacetate, Propanediol, Morus Nigra Leaf Extract, Arginine, Acetyl Tyrosine, Rehmannia Chinensis Root Extract, Pentylene Glycol, Sodium PCA, Erythritol, Chondrus Crispus, PEG-12 Dimethicone, Oryza Sativa (Rice) Bran Water, Decapeptide-52*, Calcium Pantothenate, Zinc Gluconate, Sodium Benzoate, Niacinamide, Ornithine HCL, Caprylyl Glycol, Polyquaternium-11, Citrulline, Hydrolyzed Soy Protein, Xanthan Gum, Glucosamine HCL, Disodium Succinate, Fisetin, Raspberry Ketone, Sodium Benzoate, Citric Acid, Potassium Sorbate, Arctium Majus Root Extract, Panax Ginseng Root Extract, Biotin. *OS-01 Peptide.

OS-01 HAIR should be left on and not rinsed. Apply 1mL of OS-01 HAIR serum 1-2x daily (AM or PM) directly to your scalp and massage in with your fingertips. Leave on, and do not rinse. For enhanced absorption, use a dermaroller on a clean scalp before application.

OS-01 HAIR is suitable for all hair types, including oily hair, and integrates easily into any hair care routine with visible results within as little as 90 days.