Regaine Regular Strength Regaine Regular Strength solution contains a 2% concentration of the active ingredient minoxidil. Regaine Regular Strength is proven to prevent further hair loss for 4 out of 5 men. 2 out of 5 users regrow some hair after 48 weeks. Results may be seen in as little as 16 weeks Ingredients The active ingredient is Minoxidil (2% w/v). The other ingredients are Alcohol (60% v/v), Propylene Glycol (20% v/v) & Purified Water Directions Adults: apply 1ml to the total affected area of the scalp twice daily. Not indicated for use in those under 18 or over 65 years of age.