describe the digestion and absorption of vitamin b3

Expert Solution

Vitamin B3(Niacin) is a water soluble vitamin. Niacin is naturally present in many foods, both animal based(beef, fish) and plant based ( nuts, legumes, grains) and as a dietary supplement. Niacin is absorbed in the body by small intestine and some of it by the stomach. The tissues in the body convert absorbed niacin into its metabolic active form,the coenzyme nicotinamide adenine dinucleotide(NAD). The NAD is converted into NADP(nicotinamide adenine dinucleotide phosphate) in most of the tissues.
Both NAD and NADP are required in the metabolic processes in the cells. they are primarily involved in reactions that transfers the potential energy in carbohydrates, fats, to ATP. NAD is also responsible for cellular functions such as genome integrity, control of gene expression etc.
Niacin is mostly absorbed by the body even if taken in high doses and later metabolized to NAD. The excessive niacin or unmetabolized nicotinic acid may be present in urine.

gladiator answered 1 year ago

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