Discuss sources and bioavailability of the following vitamins:

i. Niacin

ii. Cyanocobalamin

Niacin (Vitamin B3) is a water-soluble vitamin that plays a vital role in energy production, DNA repair, and the metabolism of carbohydrates, fats, and proteins. It can be found in various food sources such as meat (especially poultry and fish), whole grains, legumes, seeds, and nuts. Niacin can also be synthesized in the body ______ ____ __________ ________ _________ _________ ________ __________ ________.
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