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Some are experiencing dramatic improvements

Once ingested, Vitamin B12 is absorbed in the small intestine with the help of intrinsic factors

L-NAME and L-arginine were commercially purchased (Sigma, USA)

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We dont fully understand how, but it seems like this type of B12 could modulate the synthesis of melatonin, a hormone involved in regulating your sleep-wake cycle: Eight young males were subjected to a single blind cross-over test to see the effects of vitamin B12 (methylcobalamin) on the phase-response of the circadian melatonin rhythm to a single bright light exposure