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the claim

Sunlight lightens human hair through photo-oxidation of its melanin pigment.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that sunlight lightens human hair through photo-oxidation of its melanin pigment?

Yes. A peer-reviewed review on hair photoaging states that the most obvious effect of photoaging human hair is lightening, understood to involve an oxidative attack on eumelanin or pheomelanin melanosomes. A further paper proposes that UV exposure drives oxidative structural breakdown of melanin chromophores producing lightening.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 3
Photoaggravation of Hair Aging -
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Photoaggravation of Hair Aging - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.4103/0974-7753.58551

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More for · 2
The Analogous Degradation Pathways of Oxidative Hair dyes and Melanin: An Analysis of Conjugated Bonds, Hair Color, and How it Lightens
2025
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DeBerard, R. (. (2025). The Analogous Degradation Pathways of Oxidative Hair dyes and Melanin: An Analysis of Conjugated Bonds, Hair Color, and How it Lightens. doi.org. https://doi.org/10.26434/chemrxiv-2025-b5xlm

Aging Hair
2010
Get citation
Trüeb, R. M. & Tobin, D. (2010). Aging Hair. play.google.com. https://play.google.com/store/books/details?id=SCBeGhzSPXEC&source=gbs_api

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