l carnitine google scholar Chemical structures of L-carnitine and acetyl-L-carnitine The bright and the dark

doi: 10.3390/pharmaceutics14122790

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On a deeper level, it seems that vitamin B12's relationship with hair loss or hair growth seems to stem from its necessary function for "DNA synthesis, neurological function, and red blood cell formation," which are all important factors in helping hair cells generate, as well as keeping hair follicles, the base of the hair on the scalp, oxygenated and fed with enough nutrients from digestion as explained further below

It's a variable that can completely skew research outcomes