Minoxidil 5% is more effective than 2% for androgenetic alopecia. It is the standard strength for men and is what most UK men's products contain. The 2% strength persists mainly for women's products and for people who do not tolerate 5%.
Why 5% Works Better
More minoxidil reaching the follicle produces a greater effect on the growth phase of the hair cycle. Trials comparing the two consistently favour 5% on hair count and coverage measures.
The trade-off is proportionate: more active ingredient also means more local irritation and a greater chance of absorbed drug producing effects elsewhere.
Why 2% Still Exists
Unwanted facial hair
Minoxidil grows hair wherever it reaches, and absorbed minoxidil can produce growth away from the scalp. This is dose-related, and it is the main reason women's products are commonly 2% — unwanted growth on the forehead, temples or cheeks is a far more common reason for women to stop treatment.
Scalp tolerance
Some people simply cannot tolerate 5%. Dropping to 2% is a reasonable step before abandoning minoxidil altogether.
Format interacts with strength
A 5% foam is often better tolerated than a 2% solution, because the irritation frequently comes from propylene glycol in the solution rather than from the minoxidil. If 5% solution irritated you, try 5% foam before stepping down in strength — you may not need to give up the effectiveness.
For Women
Women's minoxidil products in the UK are commonly 2%, though 5% is used in women under guidance. This is a conversation worth having with a pharmacist or GP rather than a decision to make by buying the men's product, partly because of the facial hair risk and partly because female pattern hair loss has a wider differential — iron deficiency, thyroid disease and telogen effluvium are all common and all treatable at the cause.
Does More Than 5% Help?
Higher-concentration topical preparations exist through compounding, and low-dose oral minoxidil is prescribed off-label by some specialists. Neither is a casual upgrade:
- Compounded high-strength topicals are unlicensed, so quality and consistency vary by supplier
- Oral minoxidil is systemic by design, which brings cardiovascular considerations to the front and requires proper assessment and monitoring
Going above 5% is a clinical decision, not a shopping decision.
Practical Recommendation
Men: start at 5%, use the foam if the solution irritates, and give it four to six months before judging. Women: start with what is licensed for you and get advice before going higher. Either way, consistency at a tolerable strength beats intermittent use of a stronger one.