Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Hair greys when pigment cells slow down, and when it happens early it is mostly genetic. A few deficiencies play a role, but most greying cannot be reversed — despite many false claims.
Mostly genetic (if parents greyed early, you may too)
Deficiencies (B12, iron, copper) and thyroid issues can contribute — worth checking
Smoking and severe stress may speed it up
Correcting a deficiency may help; genetic greying usually will not reverse
Colouring is the practical option for appearance
When to see a doctor urgently
Greying with tiredness or other symptoms (check B12, thyroid)
Patchy hair or skin colour loss (possible vitiligo — see a doctor)
Beware products claiming to “reverse” grey hair
Mostly genetic — no magic cure. No oil or supplement reliably reverses genetic greying. It is worth checking for a deficiency, but manage expectations. MedDroid gives general information, not a diagnosis.
Frequently asked questions
Why is my hair greying early?
Mostly genetics. Deficiencies (B12, iron, copper), thyroid problems, smoking and stress can contribute, so a check is worthwhile — but much early greying is inherited.
Can grey hair turn black again?
Greying from a treatable deficiency may partly improve, but genetic greying usually cannot be reversed. Products claiming to “reverse” grey hair do not work.
Do stress and diet cause grey hair?
Severe stress and poor nutrition can contribute, but genetics is the main factor in early greying.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.