How to reverse grey hair?

There is no straightforward, established way to reverse grey hair. One study discussed found that graying can sometimes reverse temporarily, and the researchers linked changes in hair color with stress; it does not establish a reliable method for reversing graying generally. 1 2

• Minoxidil and scalp massage: These are discussed as ways to increase blood flow and support hair growth or help maintain hair. The episode does not present them as treatments for restoring pigment to grey hair. 3
• Low-dose tadalafil: It may increase blood flow and help slow hair loss or maintain existing hair; it is not described as reversing grey hair. 4
• Topical caffeine: It may support hair growth by inhibiting PDE and indirectly increasing IGF-1. Drinking caffeine is not expected to deliver enough caffeine to the scalp for this effect. These points concern hair growth and maintenance, not reversal of graying. 5 6