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What are the benefits of B12 (Methylcobalamin)

Lengyel Z, Lovig C, Kommedal S, Keszthelyi R, Szekeres G, Battyani Z, Csernus V, Nagy AD (2013) Altered expression patterns of clock gene mRNAs and clock proteins in human skin tumors
2011;15(3):817-829.[DOI] 58

Although sunless self-tanners might help cover the scars in some cases, regular tanning and tanning beds dont have the same effect, as the stretch marks do not get tan easily, and they might look more obvious after tanning.