How to Reverse White Hair: Can It Turn Black Again?

Can white hair turn black again? Usually not, if it is caused by age or genes. A white hair is one whose follicle has stopped making melanin, the pigment that gives hair its colour, and no oil, food or supplement has been shown to switch that back on. But some white hair is reversible: greying caused by vitamin B12 deficiency, thyroid problems, some medicines or a very stressful phase can partly recover once the cause is treated. And you can slow further greying by not smoking and keeping your health in check.

Quick answer: you cannot reliably reverse age-related or genetic grey hair naturally. If you are going grey early (before about 25 in Indians and other Asians), see a doctor to rule out B12 deficiency, thyroid disease and anaemia, because treating those can sometimes restore some colour. For the rest, the safe options are hair colour or henna, or simply embracing it.

Why hair turns white

Each hair follicle has pigment cells (melanocytes) that put melanin into the growing hair. With age, these cells and the stem cells that replace them slowly run out, and new hairs grow in with less pigment (grey) or none (white). It is gradual and follicle by follicle, which is why you see a mix of dark, grey and white.

Doctors call greying premature when it starts before about age 20 in white people, 25 in Asians (including Indians) and 30 in people of African descent.

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Causes of premature white hair

Cause	How common	Can the colour come back?
Genetics (parents or grandparents went grey early)	The most common cause	No proven way to reverse it
Vitamin B12 deficiency or pernicious anaemia	Fairly common, especially in vegetarians and people on long-term metformin or antacids	Sometimes, partly, after treatment
Thyroid disease (under- or overactive)	Common	Sometimes, after treatment
Smoking	Linked with earlier greying in several studies	Quitting may slow further greying
Severe stress	Can speed up greying in people already close to going grey	A small amount, sometimes
Vitiligo, alopecia areata	Less common; white patches of skin or hair, or patchy hair loss	Sometimes, with treatment of the condition
Some medicines	Uncommon	Often, after the medicine is changed by a doctor

What about stress?

Stress does seem to play a part. In a 2021 Columbia University study published in eLife, researchers tracked pigment along individual hairs of 14 volunteers and found that some grey hairs regained colour when stress eased, such as during a holiday. But the effect was small, and the authors said reducing stress is unlikely to bring back colour in someone who has been grey for years. Mouse studies suggest severe stress can permanently use up the pigment stem cells.

How to slow down and partly reverse white hair

There is no cure, but these steps give you the best chance of keeping the colour you have and recovering some if there is a treatable cause.

1. Get checked if you are going grey early

If you are under 25 and greying fast, or the greying comes with tiredness, tingling or numbness in the hands and feet, weight change, a racing heart, hair loss or pale patches on the skin, see a doctor. They may suggest blood tests for:

Vitamin B12 and folate
Thyroid function (TSH)
Haemoglobin and iron (ferritin)
Vitamin D, in some cases

If a deficiency is found, your doctor will tell you how to correct it. Do not start high-dose supplements on your own; they will not help if you are not deficient.

2. Eat a balanced diet with enough B12

Vitamin B12 is found naturally only in animal foods: milk, curd, paneer, eggs, fish and meat. Strict vegetarians and vegans in India are at higher risk of low B12 and may need fortified foods or a supplement, as advised by a doctor. A varied diet with pulses, whole grains, vegetables, fruit, nuts and seeds covers iron, copper and other nutrients that pigment cells need. Our guide to a well-balanced diet has more.

3. Stop smoking

Smoking is one of the few lifestyle factors consistently linked with going grey earlier, along with many far more serious harms. The National Tobacco Quitline (1800-11-2356) offers free help.

4. Manage stress and sleep

It will not undo years of grey, but regular sleep, exercise and time to wind down are good for your health in general and may slow further greying during a hard patch.

5. Protect hair from damage

Sun, harsh bleaching and heat do not cause greying, but grey hair is often drier and more fragile. Gentle washing, conditioner and less heat keep it in better condition.

Do natural remedies like amla, curry leaves or onion juice work?

Remedy	What the evidence says
Amla (Indian gooseberry)	Nutritious food; no good evidence it reverses grey hair when eaten or applied
Curry leaves in coconut oil	Popular home remedy; no reliable human studies showing reversal
Onion juice	No good evidence for grey hair; can irritate the scalp
Black tea or coffee rinses	Can temporarily stain hair darker; not a reversal
Henna (mehendi) and indigo	Colour the hair, which is a dye, not a reversal; generally safe if pure
"Anti-grey" supplements and capsules	No proof they work unless you have a deficiency

Be careful with "black henna" and some instant hair dyes. Many contain PPD (para-phenylenediamine), which can cause severe allergic reactions on the scalp and face. Do a patch test 48 hours before using any new hair dye, even one labelled "herbal" or "natural", and stop if you get itching, swelling or a rash.

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Covering white hair safely

If the grey bothers you, colouring is the only reliable option:

Henna and indigo: a natural-looking brown to black on grey hair; use pure products.
Semi-permanent colour: fades over several washes; often gentler.
Permanent colour: lasts until it grows out; best done with a patch test every time.

Many people now simply let their grey grow out. That is a perfectly healthy choice.

Sudden heavy hair fall is a separate issue; see how to stop hair fall. If you are in your twenties and noticing both greying and thinning, our guide on early twenties hair loss may help.

FAQs

Can white hair turn black again naturally?

Not if it is due to age or genetics. Hair that went grey because of a B12 deficiency, thyroid disease or a stressful phase can sometimes regain some colour after the cause is treated.

Which deficiency causes white hair?

Vitamin B12 deficiency is the best-known nutritional cause. Low iron, copper and vitamin D have been linked with premature greying in some studies, and thyroid disease can also play a part.

Does plucking one white hair make more grow?

No. Each follicle grows one hair, so plucking a white hair does not make the neighbouring ones turn white. Repeated plucking can damage the follicle, though, so it is better to trim or colour.

Can stress cause white hair?

Stress can speed up greying, especially in people already close to going grey. A small study found some hairs regained colour when stress eased, but this does not work for long-standing grey hair.

At what age is white hair normal?

For Indians and other Asians, greying that starts after about 25 is considered normal. Starting earlier is called premature greying and is often genetic, but it is worth a check-up to rule out treatable causes.

Filed under Health & Fitness

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