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Vitamin B 3, colloquially referred to as niacin, is a vitamin family that includes three forms, or vitamers: nicotinic acid (niacin), nicotinamide (niacinamide), and nicotinamide riboside. [ 1 ] [ 2 ] All three forms of vitamin B 3 are converted within the body to nicotinamide adenine dinucleotide (NAD).
Some NAD is converted into the coenzyme nicotinamide adenine dinucleotide phosphate (NADP), whose chemistry largely parallels that of NAD, though its predominant role is as a coenzyme in anabolic metabolism. In the name NAD +, the superscripted plus sign indicates the positive formal charge on one of its nitrogen atoms. A biological coenzyme ...
For women (including those pregnant or lactating), men and children the PRI is 1.6 mg per megajoule. As the conversion is 1 MJ = 239 kcal, an adult consuming 2390 kilocalories should be consuming 16 mg niacin. This is comparable to US RDAs (14 mg/day for adult women, 16 mg/day for adult men). [22]
N 1-Methyl-4-pyridone-3-carboxamide, also abbreviated as 4PY, is a breakdown product of niacin and NAD, [1] that is associated with an increased risk of cardiovascular disease. [2] It has 2 carbonyl groups that are close to each other.
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
Independently of clinical symptoms, blood level of tryptophan or urinary metabolites such as 2-pyridone/N-methylnicotinamide ratio <2 or NAD/NADP ratio in red blood cells can diagnose pellagra. The diagnosis is confirmed by rapid improvements in symptoms after doses of nicotinamide (250–500 mg/day) or nicotinamide enriched food.
Nicotinamide riboside (NR) has been identified as an NAD precursor, involved in salvage NAD synthesis in both bacteria and eukaryotes. [7] In bacteria, it was first described in 1944 as a necessary growth factor for the culture of Haemophilus influenza, H. influenza was identified as requiring both X factor and V factor (NAD) to grow. [8]
One 2021 clinical trial found that NMN improved muscular insulin sensitivity in prediabetic women, [11] while another found that it improved aerobic capacity in amateur runners. [12] A 2023 clinical trial showed that NMN improves performance on a six-minute walking test and a subjective general health assessment.
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