Interesting early evidence is a reason to investigate. It is not a reason to call an oil equivalent to 5% minoxidil.
The study behind the claim
A 2015 trial assigned 100 people to rosemary oil or 2% minoxidil. Both groups had improved hair counts at six months, with no statistically significant difference between groups. There was no placebo group. The trial did not compare rosemary with 5% minoxidil, and absence of a detected difference does not establish equivalence.
What about peppermint?
A widely shared 2014 peppermint-oil experiment involved mice. Animal findings do not demonstrate that an oil regrows hair in people with male pattern hair loss.
Supplements deserve the same questions.
“Supports hair health” and “treats male pattern hair loss” are different claims. Ask whether a nutrient deficiency has actually been identified, whether the exact formula was studied in people like you, and whether the supplement could interfere with medicines or tests. More ingredients do not automatically create a better product.
A practical way to read a product page
- Find the study, not just a citation count or a percentage in an advertisement.
- Check whether it tested humans, the actual ingredient and the same formulation.
- Look for the control group, sample size, study length and who funded it.
- Read the adverse events and limitations alongside the result.
- Calculate the cost of continued use before buying several months at once.
Natural products can cause irritation or allergic reactions. Discuss them with your clinician, especially if hair loss is unexplained. A cosmetic scalp serum should not delay diagnosis.