Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B12 (Cobalamin) vs. Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B12 (Cobalamin)
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Vitamin B12 is a cobalt-containing water-soluble corrinoid synthesized exclusively by microorganisms. Adult RDA is 2.4µg/day (no Upper Limit established), required for DNA synthesis, methionine synthase homocysteine conversion, and myelin sheath maintenance.
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.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Water-Soluble Corrinoid Vitamin | Water-Soluble Pyridine Vitamin |
|
Adult RDA / RDI
|
2.4 µg / day (2.6µg pregnancy, 2.8µg lactation) | 16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) |
|
Tolerable Upper Limit (UL)
|
None Established (Extremely low toxicity) | 35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) |
|
Chemical Forms
|
Methylcobalamin (Active), Adenosylcobalamin (Active), Cyanocobalamin (Stable synthetic) | Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) |
|
Primary Biological Function
|
Methionine synthase cofactor, Methylmalonyl-CoA mutase cofactor, Myelin integrity, Erythropoiesis | NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation |
|
Deficiency Condition
|
Pernicious / Megaloblastic Anemia, Irreversible Neurological Peripheral Neuropathy | Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) |
|
Top Whole Food Sources
|
Oysters, Beef Liver, Sardines, Salmon, Beef, Dairy, Eggs (Absent in unfortified plant foods) | Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms |
|
Absorption Mechanism
|
Requires Gastric Acid, R-Protein, and Intrinsic Factor (IF) via Ileal Cubam receptors | — |
|
Tryptophan Biosynthesis Pathway
|
— | 60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) |
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