What your drugstore scalp serum
is actually doing.

I want to be careful about how I say this. I am not going to name brands. The supplements and serums I am about to describe are legal, mass-produced under cosmetic safety rules, and not dangerous. They are also, in my experience as a trichologist, mostly ineffective for the outcomes they quietly promise on their front-of-bottle copy — and I think people deserve to know the difference.

Biotin first. Biotin is a B-vitamin, essential for a thousand metabolic reactions. A true biotin deficiency causes hair loss. Almost no one who shops for a biotin supplement has a biotin deficiency. The rare patient of mine who did turned out to have a gastric-bypass malabsorption issue that a supplement could not solve. For the rest of my patients, the biotin did nothing except show up in their urine. The clinic literature is unambiguous on this — a 2017 review in the Journal of the American Academy of Dermatology found zero evidence of benefit in non-deficient patients.

Caffeine is a slightly different story. There is weak, in-vitro evidence that topical caffeine extends the anagen (growth) phase of follicles in cultured tissue. The problem is the delivery. To reach the follicle at the concentration the in-vitro studies used, you would need to apply a caffeine tonic four times a day, under occlusion, for months. No one does this. Every drugstore caffeine tonic I have reviewed sits at concentrations an order of magnitude below the threshold. The smell is the ingredient.

Saw palmetto is marketed as a natural DHT blocker. In clinical use — the only kind that counts — the effect sizes are small, the oral dosing is inconsistent, and the topical application is essentially unstudied. My patients who tried it reported the same thing my patients on a placebo reported: that the shedding slowed down after six weeks, which is what the shedding does on its own.

The minoxidil-adjacent peptide story is more troubling. There is a category of copper peptides and biomimetic peptides marketed with strong implications they work like prescription minoxidil. They do not. The molecules are different, the mechanisms are different, and in the rare head-to-head studies that exist, the peptide products underperform even placebo saline.

I do not say any of this to mock the industry. The industry is doing what it is paid to do, which is sell hope in two-ounce bottles under pharmacy lighting. I say it because the women in my chair deserved to know the truth before they spent another two hundred dollars a year on things that would not help them.

Meori is not a fix. It is the single quiet serum I formulated for the patients who had been through two or three of these bottles and come back to me thinner, sadder, and out fifteen weeks of consistent use. It is what I would give someone I loved.