Three shampoos, 150 men, six months. The ingredient in almost every anti-dandruff bottle on the shelf came last on shedding and slightly thinned the hair shafts. Here is what the trial found and what is actually worth using.
Hair & Scalp
The hairs falling out were already finished. That single fact would keep more people on minoxidil than anything else, and it appears on no packaging. Here is the real timeline, week by week, from the trial data.
The comparator nobody mentions. Dhurat’s famous result, 91.4 hairs against 22.2, is quoted everywhere as proof that microneedling grows hair. Both arms were on minoxidil. The trial compared drug-plus-roller against drug, which means it’s evidence for the combination and says nothing about rolling alone. All twelve randomized trials in the 2025 meta-analysis did the same…
