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Most of the known carotenoids can be converted into retinol.

Calcification of soft tissue resulting from hypercalcemia is a potential problem of taking megadoses of vitamin D (>10,000 IU/day).

Name the neurotransmitter derived from tryptophan that required vitamin C for its production.   

Vitamin C is necessary for both the synthesis and catabolism of tyrosine.

The various forms of cobalamin cannot be interconverted. As a result, the active coenzyme forms of cobalamin must be consumed directly in the diet.

Pernicious anemia can be cured by supplementation with pharmacological doses of folic acid.

Vitamin B12 can be excreted into the bile and then recycled by being reabsorbed through the enterohepatic circulation. 

In species that can make it, vitamin C is made from what common compound found in the body?

The genetic disorder trisomy 21, also known as Down syndrome, is associated with folate deficiency.

Instantaneous communication of electro-chemical signals between the cytoplasm of cardiac muscle fibers       is assisted by ______.