Rogaine is one of the best hair growth serums that you can apply to your treated area. Rogaine’s hair growth serums contain 2% to 5% minoxidil and don’t have harmful chemicals that your skin may react to. After using DermaPen for hair loss, we advise that you wait at least 24 hours before you apply minoxidil. Give your skin more time to breathe and heal before you start applying Rogaine or other minoxidil products.