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Although, endogenous melatonin production is closely related with the onset and offset of sleep, few associations have been found between melatonin production and sleep stages (95), and sleep deprivation does not abolish the melatonin rhythm

Both compounds are substrates for P-glycoprotein (P-gp) [109,110,111,112,113,114]

But what are B12 shots specifically good for, and why cant you just use oral B12 tablets instead

The authors suggested that this would lead to increased pools of methylated thiopurine metabolites, which might inhibit de novo purine synthesis and, thus, lead to lower levels of endogenous purines to compete with 6-TGN to be incorporated into DNA