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Unexplained fatigue despite adequate rest, decreased training capacity without apparent cause, or slow recovery between sessions all warrant investigating your B12 status
(1) In skin cell and hair follicle cell cultures Copper is a cofactor for key enzymes like lysyl oxidase (collagen/elastin crosslinking) and tyrosinase
Its FDA label specifies sterile water, but that is regulatory convention, not the gentler diluent
It works by inhibiting an enzyme called NNMT (nicotinamide N-methyltransferase), which plays a role in slowing metabolism and increasing fat storage as we age
it is whether they get a meaningful amount of the vitamin at all
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