Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide) vs. Vitamin D3 (Cholecalciferol)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Vitamin D3 (Cholecalciferol)
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 D3 is a secosteroid prohormone synthesized endogenously in skin via solar UVB irradiation of 7-dehydrocholesterol. Adult RDA is 600–800 IU (15–20µg), with a Tolerable Upper Limit of 4,000 IU (100µg)/day, regulating systemic calcium absorption and immune gene expression.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Water-Soluble Pyridine Vitamin | Fat-Soluble Secosteroid Prohormone |
|
Adult RDA / RDI
|
16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) | 600 – 800 IU / day (15 – 20 µg) |
|
Tolerable Upper Limit (UL)
|
35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) | 4,000 IU / day (100 µg) (Endocrine Society: up to 10,000 IU safe) |
|
Chemical Forms
|
Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) | Cholecalciferol (D3 - Animal/Lichen), Ergocalciferol (D2 - Fungi) |
|
Primary Biological Function
|
NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation | Calcitriol receptor (VDR) activation, intestinal calcium/phosphorus absorption, antimicrobial peptide synthesis |
|
Deficiency Condition
|
Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) | Rickets (children), Osteomalacia (adults), Immune dysregulation |
|
Top Whole Food Sources
|
Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms | Sunlight UVB, Atlantic Salmon, Sardines, Egg Yolk, Fortified Milk |
|
Tryptophan Biosynthesis Pathway
|
60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) | — |
|
Target Serum 25(OH)D Level
|
— | 30 – 50 ng / mL (75 – 125 nmol / L) |
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