Why does hair turn gray and fall out as we age?
Oxidative Stress in Ageing of Hair
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Hair turns gray and falls out because of damage from 'rust' inside the body called oxidative stress. As we get older, our body's protection against this rust weakens, especially in hair cells.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
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Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Hair turns gray and falls out because of damage from 'rust' inside the body called oxidative stress. As we get older, our body's protection against this rust weakens, especially in hair cells.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
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Going gray isn’t just about getting older — it’s because of damage from stress inside the hair roots, where too much hydrogen peroxide builds up and the body can’t fight it off anymore.
Gray hairs have more damaging chemicals like hydrogen peroxide and less of the protective enzymes that normally keep those chemicals in check.
When too much hydrogen peroxide builds up in your hair follicles, it stops the pigment-making enzyme from working, which is why hair turns gray over time.
When the stem cells that give your hair its color get worn out or change too early because of stress in the cells, they stop making pigment, and your hair turns gray permanently.
As we age, our hair might turn gray because of a buildup of a natural chemical called hydrogen peroxide in the hair, and our body's ability to clean it up weakens — this messes with the pigment-making process in hair.