The benefits of Minoxidil in shampoo are slowing and/or stopping hair loss, promoting the re-growth of hair and strengthening existing hair follicles. The Food and Drug Administration approved Minoxidil to treat hair loss in men and women.
Researchers found that shampoo with Minoxidil had a positive effect on both male and female test subjects. The product takes time to become effective. Often users must use the product for a few months before seeing a noticeable cosmetic difference.
Minoxidil is a medication, originally developed to treat high blood pressure. Possible negative side effects include skin rash, hair growth on face and body, irregular heartbeat, swollen feet and legs, and stinging where the medication is applied.