There’s finally a way to restore lost hair naturally and painlessly. Our carbonic acid shampoo with 5% minoxidil is a scientifically backed formula to spur rapid overall hair growth even if you’ve been bald for decades.There’s finally a way to restore lost hair naturally and painlessly. Our carbonic acid shampoo with 5% minoxidil is a scientifically backed formula to spur rapid overall hair growth even if you’ve been bald for decades.