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|Halacha - lo silbash|
|Submitted by marvin Answered by Rav Peretz Moncharsh|
According to many Poskim there is an issur d'oraisa for a man to dye white hairs. Since I am not aware of any source or conclusive reason to differentiate between dye and melanin, I don't see any grounds to be lenient. If the melanin would keep black hairs from turning grey, it seems that it should be permitted.