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doctors best real niacin 120 tablets magnesium malaat L-theanine (L-glutamic acid-gamma-monoethylamide) is aNiacin NiaXtend by Doctor's Best Niacin (nicotinic acid) is a water soluble vitamin (B3) that plays a role in over 200 biochemical reactions in the body. It contributes to normal energy production, the proper functioning of the nervous system as well as normal psychological functioning. Vitamin B3 is also important for the metabolism of fats, carbohydrates and proteins. Less niacin flush There are two forms of vitamin B3: niacin (or nicotinic acid)