If your hair is turning gray because you don’t have enough vitamin B12, fixing that deficiency might bring back your natural hair color—but this hardly ever happens, and it won’t work if something else is causing the graying.
Evidence from Studies
Supporting (2)
Community contributions welcome
Reversible hyperpigmentation of skin and nails with white hair due to vitamin B12 deficiency.
A person with low vitamin B12 turned gray too early, but after getting B12 shots, their hair turned back to its original color — showing that fixing the deficiency can sometimes reverse gray hair.
This study says that if your hair is turning gray too early because you’re low on vitamin B12, fixing that deficiency might help your hair color come back — but only sometimes, and only if B12 was the real cause.
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.