BENEFITS
Daily serum designed to nourish the scalp and reactivate your hair’s natural growth cycle01
Prevent a root cause of hair thinning
Prevents the accumulation of the cells that contribute to a disrupted hair growth cycle due to age, stress, and genetics.03-09
Scalp health
Safe for sensitive skin and promotes a healthy scalp microbiome, which can help foster healthy follicle function and hair density.01,09
Thicker, denser, fuller hair
Key ingredients complement the OS-01 peptide to promote strong, healthy hair.01
Not sure what type of hair loss you're experiencing? Take the quiz to find out how OS-01 HAIR might help.
CLINICAL DATA
Visible results, scientifically validated
86.67
of participants showed an increase in hair density (average +39.62%) after 6 months 01
83.33
participants showed an increase in hair thickness (average +42.58%) after 6 months 01
80
of participants observed overall improvements in their hair after 3 months 01
76.67
of participants said the overall health of their hair improved after 6 months 01
5-STAR REVIEWS
See why customers love OS-01 HAIR
"Just fantastic regrowth in areas where I desperately needed it." — LaDonna L., Beta Tester
"It worked so well! No irritation and dried without leaving a residue." — Jodi F., Beta Tester
"This is a real solution. Others promise. This delivers. I can only imaging what I'd have to pay to have this in my daily routine—and yes, I will pay it. After a certain age, you pay what you must—not to look younger, but to look your best." — Queen E., Beta Tester
The proof is in the pictures
What makes OS-01 HAIR unique?
- Model
- Proprietary ingredient
- No harsh side effects
- Lightweight & non-greasy
- Drug-free
- No prescription
- Supports scalp health
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OS-01 HAIR
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Prescription Hair Treatments
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Leading Supplement
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- N/A
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Leading Hair Serum
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Invasive Treatments (PRP, hair transplant, etc.)
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DIY Oils
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The science behind OS-01 HAIR
The science behind OS-01 HAIR
Your scalp ages just like the rest of your skin. But instead of lines and wrinkles, the accumulation of senescent cells impairs how your hair follicles function, leading to thinner, weaker strands over time.03-05
OS-01 HAIR was developed to target this issue at the root. It’s the first and only scalp serum powered by the OS-01 peptide, scientifically proven to reduce cellular senescence—a key driver of age-related hair thinning.02,09
When tested on senescence-induced cells in the lab, OS-01 HAIR significantly reduced senescence, reinforcing OS-01 HAIR’s potential to address one of the core biological processes behind age-related thinning and hair loss.03-09
Just like healthy skin supports better texture and tone, a healthier scalp sets the stage for stronger, fuller hair.
6 active ingredients complement the OS-01 peptide
How to Apply OS-01 HAIR
- We recommend applying one full pipette (2 squeezes) to the entire scalp during each application.
- Fill the glass pipette by squeezing the applicator bulb, one squeeze will give you half the application dose. Apply the serum directly to your scalp, starting at your natural part or hairline.
- Refill the glass pipette again, with a second squeeze, and continue applying to areas of concern to complete the full dose.
- Massage the serum into your scalp with your fingertips to ensure even distribution.
- Do not rinse. Style as usual.
- Use daily on dry or damp hair.
A 50 mL bottle of OS-01 HAIR should last approximately 30 days with regular use.
Your OS-01 HAIR questions answered
All Ingredients
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 peptide scalp serum
- NBNancy B.Verified BuyerReviewingOS-01 HAIR peptide scalp serumI recommend this productRated 5 out of 5 stars3 days agoThinning Hair
I just started using the hair serum and already find my hair feels thicker. It will take time for new growth.
- MCMary C.Verified BuyerReviewingOS-01 HAIR peptide scalp serumI recommend this productRated 5 out of 5 stars4 days agoPost chemo baby hairs are back with a vengeance
Super happy with this product, my hair has been thin and struggling to grow back after over a year on chemo and is finally looking thick and bushy which I’d given up on. AMAZING product range truly and worth every penny!!!
OneSkinYesterdayHi Mary!
Thank you so much for sharing this incredible feedback! We’re truly honored to hear that our product has made such a positive impact on your hair journey, especially after everything you’ve been through. It means the world to us to be part of your recovery and self-care process. Your kind words and support inspire our entire team, and we’re so glad you're seeing the results you deserve. Here’s to continued growth and confidence — we’re cheering you on every step of the way!
- CKchristy k.Verified BuyerReviewingOS-01 HAIR peptide scalp serumI recommend this productRated 4 out of 5 stars4 days agoSo far so good
I have been using the scalp serum for about 3 weeks now. I like the lightweight ness of the product and the way the dropper bottle is made and holds the dropper. I wish there was more specific instructions on how to apply it. It says to part and to roll in alternating directions, but how far apart should the sections be? And should we alternate the directions of the parts (vertical v. Horizontal)? It’s also a bit challenging to apply alone and takes quite some time. I actually have my husband help me because it would take me over an hour to do alone. I haven’t seen any new growth yet, but it’s still early.
OneSkin3 days agoHi Christy!
Thank you for your review! We are happy to hear you are enjoying OS-01 HAIR!
Please reach out to our support team at support@oneskin.co and we would love to give you some personalized advice on how to get the most use out of OS-01 HAIR!
- JMJacqueline M B.Verified BuyerReviewingOS-01 HAIR peptide scalp serumI recommend this productRated 5 out of 5 stars5 days agoI’ve tried everything and this one is giving me visible results!
It’s very easy to use and I’m already seeing new growth 3 week into the applications!
- PDPhyllis D.Verified BuyerReviewingOS-01 HAIR peptide scalp serumRated 3 out of 5 stars1 week agoNot enough in bottle …
First the dropper doesn’t pull but maybe 1” product in dropper. If I have to put this on my scalp, there is not enough in the bottle… it’s almost gone🤷♀️ I don’t understand …if I’m applying it wrong…? Too expensive if I have to buy every two weeks…
OneSkin3 days agoHi Phyllis!
Thank you for your review! We recommend applying one full pipette (2 squeezes) to the entire scalp during each application.
One squeeze should fill the dropper to the 5ml line! If you need personalized advice on how to get the most out of your OS-01 HAIR(making sure you are using the suggested amount), please email support@oneskin.co!
Related Articles
Citations
01 Shown in 6 month double-blind, independent, third-party clinical study with 30 participants using OS-01 HAIR and dermaroller daily. Results based on self-perception reporting and clinical measurements of anagen hairs per cm2, intermediate terminal hairs, hair shaft thickness, inter follicular mean distance, hair count per cm2, and scalp microbiome.
02 Zonari, A., et al. Senotherapeutic peptide treatment reduces biological age and senescence burden in human skin models. npj Aging, 9(1), 1-15. 2023. doi:10.1038/s41514-023-00109-1
03 Mirmirani, Paradi., et al. Age-related hair changes in men: Mechanisms and management of alopecia and graying. Maturitas, 80(1), 58 - 62. 2015.https://www.sciencedirect.com/science/article/abs/pii/S0378512214003259
04 Shin, Wisoo et al. Dysfunction of Hair Follicle Mesenchymal Progenitors Contributes to Age-Associated Hair Loss. Developmental Cell, 53(2), 185 - 198. 2020https://www.sciencedirect.com/science/article/pii/S1534580720302318
05 Huang, Wen-Yen., et al. Stress-induced premature senescence of dermal papilla cells compromises hair follicle epithelial-mesenchymal interaction. Journal of Dermatological Science, 86(2), 114 - 122. 2017
https://www.sciencedirect.com/science/article/abs/pii/S0923181117300269
06 Lee, Sunhyoung et al. Ganoderma lucidum extract attenuates corticotropin-releasing hormone-induced cellular senescence in human hair follicle cells. iScience 27(5), 2024https://pmc.ncbi.nlm.nih.gov/articles/PMC11068553/
07 Lingna Chen, Y.M.Y.F., et al. Cellular senescence: ageing and androgenetic alopecia. Dermatology, 239, 533-541. 2023.
https://karger.com/drm/article/239/4/533/836627/Cellular-Senescence-Ageing-and-Androgenetic
08Bahta, Adiam W., et al. Premature Senescence of Balding Dermal Papilla Cells In Vitro Is Associated with p16INK4a Expression. Journal of Investigative Dermatology, 128(5), 1088 - 1094.2008.
https://www.jidonline.org/article/S0022-202X(15)33852-5/fulltext
09 Based on data from clinical studies and/or lab studies conducted on human skin samples, 3D skin models, and skin or hair cells in the OneSkin lab. Explore more at oneskin.co/claims
10 Pappalardo, Alberto., et al. Restoration of hair follicle inductive properties by depletion of senescent cells. Aging cell, 24(1). 2025.
https://pubmed.ncbi.nlm.nih.gov/39614601/
11 Baar, Marjolein P et al. Targeted Apoptosis of Senescent Cells Restores Tissue Homeostasis in Response to Chemotoxicity and Aging. Cell, 169(1), 132-147. 2017.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5556182/
12 Shown in a 3 month beta test (brand led consumer perception study) with 22 participants and daily application of OS-01 HAIR (no dermaroller).