Gray hair is a common marker of aging, and for those who wish to keep their original color, the question is simple: can you reverse gray hair? Experts in hair and scalp science say the answer is likely no, at least not in a way that is permanent. The process of hair losing its color is seen as a one-way street caused by biological changes that do not seem reversible.
While the arrow of time generally moves in one direction, a small amount of evidence suggests that temporary color change may be possible under very specific circumstances.
Stress reduction can lead to temporary color return
A small study from 2021 explored the role of stress in the graying process and found that periods of stress reduction correlated with a temporary reversal of gray hair. In specific cases, researchers observed strands of hair that were dark at the ends but gray in the middle. This suggests that for some people, the hair follicle paused its graying and began repigmenting when personal stress decreased. For one study participant, this reversal happened after taking a two-week vacation.
However, experts stress that genetics is still the primary determinant of when a person begins to go gray. If you have a family history of early graying, you are likely to experience it yourself, regardless of stress management. For most people, a good colorist remains the only way to manage the issue. New findings are being explored about how stress may be good for your brain when it is controlled, but chronic stress is likely to impact the body negatively in many ways.
Environmental factors increase the risk of going gray
Beyond natural aging and family history, scientists point to environmental factors as a key cause of gray hair risk. The main mechanism is oxidative stress, damage to cells and DNA caused by unstable molecules called free radicals. Free radicals are produced naturally in the body but are also caused by external factors such as pollution and smoking.
Experts note that oxidative stress definitely increases the risk of graying. Although research is ongoing, some evidence suggests that antioxidant-rich foods like pecans and blueberries can reduce the effects of aging by combating free radicals. This may reduce cellular damage, including the kind that affects hair color.
The future of reversing color by reactivating melanocytes
Scientists previously thought that the melanin-forming cells, known as melanocytes, which give hair its color, died off with age. However, a 2023 study on rats showed that these cells may not die but instead become concentrated at the hair follicle’s root. They simply stop moving up the hair strand to provide pigment.
This new understanding opens the door for potential medical treatments. If scientists can find a way to reactivate or stimulate these melanocytes to migrate back up the hair strand, it may be possible to make the hair dark again. As of now, though, there is no medical process that can achieve this, and the current state of science indicates that a permanent, non-cosmetic reverse gray hair solution is not yet available.
eLife – Stress reversal of graying hair in humans – 2021
A small study examined human hair strands to find that periods of stress reduction correlated with a temporary reversal of the graying process.4 For one participant, taking a two-week vacation correlated with a repigmentation of hair.
Nature – Stem cell competition in the hair follicle niche orchestrates graying – 2023
A study in rats challenged the belief that melanocytes die off with age. The research found that melanocytes may simply become concentrated at the follicle root instead of migrating up the hair strand to provide pigment.
Live Science – Can gray hair be reversed? – 2024
This article summarizes expert opinions from dermatologists and trichologists who generally agree that gray hair is not permanently reversible due to aging. It also highlights the roles of genetics, environmental oxidative stress, and the potential for new medical treatments that target melanocytes.
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