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Description
Effects of nicotinamide N-methyltransferase (NNMT) inhibition on the aerobic and the anaerobic endurance exercise capacity

Its exposure to light and temperature fluctuations should be minimized

So, the answer is no, you can not overdose on B12 vitamins

284 , F840F851 (2003)

It also promotes wound healing and cell regeneration, accelerating the skins natural repair processes

The rate and extent of absorption after a particular route of administration depends on both drug and patient factors
