What The Ordinary Isn't Telling You About Their Hair Density Serum…
📚 Main topics
- What The Ordinary claimsThe Ordinary describes its Multi-Peptide Serum for Hair Density as a leave-in scalp formula for thicker-, denser-, fuller-looking hair, but makes no direct hair-growth claims. Its formula lists Redensyl, Procapil, Capixyl, Baicapil, Anagain, and caffeine. 1:32
- The evidence behind the ingredientsThe video reviews supplier dossiers and studies for the five trademarked ingredients, including proposed mechanisms and reported changes in hair growth and shedding. Most of the cited results come from small studies, and some are manufacturer-provided marketing materials rather than independent evidence. 10:16
- Study limitationsThe dossiers often provide little detail about study design, controls, methods, or statistical significance. Some tests were in vitro or ex vivo, and several human trials had small sample sizes or short testing periods. 5:39
- The Ordinary’s responseThe company acknowledged that current evidence largely comes from small-scale studies, combined-ingredient formulations, and manufacturer-sponsored or conducted research. It said larger independent, placebo-controlled trials are needed to establish efficacy. 29:57
- How the serum feels to useAbbey says the serum feels heavier and oilier than the Pantene and Neutrogena products she compared it with, and can leave her roots looking greasy. It has no noticeable smell or sensation, but daily use may not suit people with oily scalps or infrequent wash routines. 34:37
✨ Key takeaways
- Supplier claims are not proof of finished-product resultsIngredient dossiers can describe promising mechanisms or results, but their findings apply to the tested raw materials and formulas—not automatically to The Ordinary’s finished serum. Supplier materials may also emphasize the most favorable results. 6:41
- Treat dramatic comparisons cautiouslySome supplier materials compare ingredients with minoxidil, but these claims are not enough to establish equivalent effectiveness. Abbey cautions viewers not to stop minoxidil based on such claims. 13:51
- Limited evidence does not prove the ingredients cannot workThe available studies have significant limitations, but those limitations do not establish that the ingredients are ineffective. They mean the strength of the evidence is uncertain. 37:14
- The Ordinary is not the only optionAbbey says the available evidence for The Ordinary, Pantene, and Neutrogena is difficult to compare because they make different claims and rely on different kinds of research. 36:11
🧠 Lessons learned
- Understand what different study types showIn vitro studies take place outside a living organism, ex vivo studies use tissue outside its host, and in vivo studies take place within a living organism. These methods provide different kinds of evidence and should not be treated as interchangeable. 12:19
- Regulatory approval reflects a higher evidence barA lack of FDA approval does not automatically mean an ingredient cannot affect hair growth, but it does mean it has not gone through the same rigorous evaluation as an FDA-approved treatment. 33:34
- Consider cost, evidence, and personal fitA lower price may make a serum accessible and worth trying for some people, but price, the quality of evidence, and how the product feels to use are all relevant to an individual decision. 38:16
🏁 Conclusion/next steps
- Abbey’s choiceAbbey says she will continue using Pantene and Neutrogena rather than The Ordinary’s serum, mainly because she dislikes its heavier residue. She emphasizes that this is a personal preference, not a claim that the product cannot work. 35:39
- Make an informed decisionThe video recommends taking the evidence with a grain of salt, not replacing minoxidil based on supplier claims, and discussing treatment choices with a dermatologist. People who are interested in the serum should weigh its uncertain evidence and texture against their own needs and budget. 32:32
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Transcript excerpt
0:00 How on earth can a $24 hair serum do this when it doesn't technically claim to promote hair growth? I reached out to The Ordinary to get some answers, and their response was not what I expected. So, I'm here to share it with you today. If you are new here, this is part of a series I'm working on to compare the most popular hair loss serums in the market. And to make this series as accurate and informative as possible, I've been reaching out to brands behind the scenes to share if they will disclose anything about how their formulas work and the evidence that they have to support the claims that they
0:31 make about their formulas, if any. Then, as brands respond to all of my questions, I bring everything to you here on YouTube. We started with Pantene, followed up with Neutrogena. And now we are ready to talk about one of the hair serums that I have undoubtedly been asked about the most over the past few years. The Ordinary Multi-Peptide Serum for Hair density. I specifically remember when this product started getting a ton of buzz because it was right when I started getting really into learning about hair care. Since then, I feel like it has definitely continued to have a steady amount of
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Questions & Answers
Common questions about this video
What does The Ordinary claim its Multi-Peptide Serum for Hair Density does?
The Ordinary describes it as a concentrated leave-in formula designed to support the scalp and give hair a thicker, denser, fuller-looking appearance. It does not make explicit hair-growth claims. 1:32
Which trademarked ingredients are in The Ordinary's hair density serum?
The formula contains Redensyl, Procapil, Capixyl, Baicapil, Anagain, and high-solubility caffeine. 2:02
What limitations did Abbey identify in the evidence for the serum's ingredients?
She found issues including small sample sizes, short study periods, vague descriptions of study methods, missing control groups or statistical details, and variables that were not isolated. She also noted that much of the research came from ingredient manufacturers. 5:39
Did The Ordinary say the evidence proves its hair density ingredients work?
No. The Ordinary said the available clinical evidence is largely based on small studies, combined-ingredient formulas, and research sponsored or conducted by manufacturers. It said larger, independent, placebo-controlled trials are still needed to establish definitive efficacy. 29:57
Should someone stop using Minoxidil and switch to The Ordinary's serum?
Abbey cautioned against replacing Minoxidil with this serum based on ingredient-supplier claims, including claims comparing ingredients to Minoxidil. She said those claims should not be taken at face value. 13:51
What did Abbey think of the serum's texture and how it felt on her scalp?
She found it oilier than the Pantene and Neutrogena serums and said it left her roots looking greasy, especially right after application. Some residue absorbed overnight, but she did not consider it lightweight or residue-free. 34:37
Did Abbey decide to use The Ordinary's hair serum?
No. She said she would continue using Pantene and Neutrogena because she did not love applying The Ordinary's serum. She emphasized that this did not mean she thought the product was bad or could not work for others. 35:39
What was Abbey's overall view of whether the serum can work?
She said the available evidence has serious limitations, but that does not prove the ingredients cannot work. She acknowledged that some users report great results and said the choice depends on what works for a person's hair and budget. 37:14
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