Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide) vs. Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Comparing 2 standards across 9 specifications. 8 key differences identified.
Comparing:
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Vitamin B3 comprises nicotinic acid and nicotinamide, precursors to NAD+ and NADP+ coenzymes central to over 400 enzymatic cellular reactions and DNA repair by PARP enzymes. Adult RDA is 16 mg NE (men) / 14 mg NE (women), with a Tolerable Upper Limit of 35 mg/day.
Vitamin B6 is a water-soluble pyridine vitamin acting via its active coenzyme Pyridoxal 5'-Phosphate (PLP) in over 140 amino acid decarboxylation, transamination, and neurotransmitter synthesis reactions. Adult RDA is 1.3–1.7 mg, with a Tolerable Upper Limit of 100 mg/day.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Water-Soluble Pyridine Vitamin | Water-Soluble Pyridine Vitamin |
|
Adult RDA / RDI
|
16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) | 1.3 mg / day (Adults 19–50) / 1.7 mg (Men 51+) / 1.5 mg (Women 51+) |
|
Tolerable Upper Limit (UL)
|
35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) | 100 mg / day (US FDA/NIH) / 12 mg / day (EFSA, revised down from 25mg in 2023) (Avoid sensory peripheral neuropathy) |
|
Chemical Forms
|
Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) | Pyridoxal 5'-Phosphate (PLP, active coenzyme), Pyridoxine HCl, Pyridoxamine |
|
Primary Biological Function
|
NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation | Transamination / deamination of amino acids, Serotonin / Dopamine / GABA synthesis from amino acids, Glycogen phosphorylase cofactor, Heme synthesis |
|
Deficiency Condition
|
Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) | Microcytic sideroblastic anemia, Seborrheic dermatitis, Cheilosis, Peripheral neuropathy, Convulsions |
|
Top Whole Food Sources
|
Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms | Chickpeas, Wild Salmon, Yellowfin Tuna, Beef Liver, Chicken Breast, Russet Potatoes, Bananas |
|
Tryptophan Biosynthesis Pathway
|
60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) | — |
|
Neurotoxicity Threshold
|
— | Chronic megadosing of Pyridoxine HCl (>200–500mg/day) causes reversible sensory neuropathy due to competitive inhibition of tissue PLP |
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