Question: what is the difference between 2 and 5 minoxidil?
Answer: Minoxidil is a hair-growth/anti-hairfall treatment. It's molecular formula is C9H15N5O. Coming back to your query, 2% Minoxidil is foamy, water-based and highly recommended for women only, whereas the 5% Minoxidil is a bit more concentrated and hence, recommended for receding hairline for men.