Vitamin PP (aka nicotinic acid, vitamin B3, niacin). And nicotinamide. WHY are they to us?

Vitamin PP (aka nicotinic acid, vitamin B3, niacin). And nicotinamide. WHY are they to us?
Involved in many and varied metabolic and redox processes occurring in the body. Actively participates in the metabolism of lipids, proteins and amino acids, carbohydrates.
Naturally, its deficiency affects the nervous and digestive systems, and the skin. It has a wide range of beneficial therapeutic effects and indications. Known research on the possibility of preventing the development of Alzheimer's disease. The sources of its regular production from plant and animal products are described.
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