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What is Niacinamide?
Niacinamide, often referred to as flush-free niacin, is a water-soluble form of Vitamin B3 that the body can make from niacin when there is a niacin surplus. Vitamin B3 is commonly found in meat, fish, eggs, dairy products, and whole wheat.  Though niacin and niacinamide offer similar benefits, niacinamide does not cause the ‘niacin flush’ — whereby the skin becomes red, warm, and tingly.  It avoids causing this flush because unlike niacin, niacinamide does not act on the HM74A receptor that causes the flush. 
Niacinamide has cellular health properties, supplementing a healthy immune system and motor control capabilities.  Niacinamide intake is correlated with promoting a gain in muscular strength. Niacinamide also supplement the flexibility and promotes the rebuilding of cartilage that allows movement. Additionally, niacinamide is suppelemental in the metabolizing of proteins, amino acids, and lipids. It also aids in the healthy functioning of nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP), which are two compounds responsible for energy transfer reactions.* 
The recommended dosage is 125mg daily.
Additional ResourcesNicotinamide Wikipedia Entry
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Scientific studies cited are not conclusive and have limitations, due to of their closed environment nature. Referenced studies will not necessarily determine your experience with a supplement or nootropic, since there are many unaccounted variables, which fall outside the scope of the studies.
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