Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide) vs. Vitamin B7 (Biotin / Vitamin H)
Comparing 2 standards across 10 specifications. 10 key differences identified.
Comparing:
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Vitamin B7 (Biotin / Vitamin H)
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 B7 is an essential sulfur-containing water-soluble vitamin serving as a prosthetic group for five carboxylase enzymes in gluconeogenesis, lipogenesis, and branched-chain amino acid catabolism. Adequate Intake (AI) is 30 µg/day (no Upper Limit established).
Specification Comparison Table
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Water-Soluble Pyridine Vitamin | Water-Soluble Ureido-Tetrahydrothiophene Vitamin |
|
Tolerable Upper Limit (UL)
|
35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) | None Established (No adverse effects recorded) |
|
Chemical Forms
|
Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) | D-Biotin (Biologically active isomer), Biocytin (Biotinyl-lysine) |
|
Primary Biological Function
|
NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation | Prosthetic group for Pyruvate Carboxylase (Gluconeogenesis), Acetyl-CoA Carboxylase (Fatty acid synthesis), Propionyl-CoA Carboxylase, Histone biotinylation |
|
Deficiency Condition
|
Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) | Alopecia (Hair loss), Erythematous scaly periorofacial rash, Brittle nails, Neurological depression / hallucinations |
|
Top Whole Food Sources
|
Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms | Egg Yolk, Beef Liver, Salmon, Pork Chop, Sunflower Seeds, Almonds, Sweet Potatoes |
|
Adult RDA / RDI
|
16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) | — |
|
Tryptophan Biosynthesis Pathway
|
60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) | — |
|
Adult Adequate Intake (AI)
|
— | 30 µg / day (35 µg during lactation) |
|
Raw Egg White (Avidin) Interaction
|
— | Raw egg albumen contains avidin glycoprotein which binds biotin with Kd ~10^-15 M (the strongest non-covalent bond known), completely blocking absorption unless cooked |
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