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What vitamin is necessary to convert cholesterol into bile acids?

The RDA is increased for folate when a woman becomes pregnant.

Most of the known carotenoids can be converted into retinol.

The appearance of a rachitic rosary is symptomatic of a deficiency of what vitamin?

Name the person who won the 1964 Noble Prize in Chemistry for determining the 3-dimensional structure of vitamin B12 using X-ray crystallography?

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

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

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

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

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