Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B2 (Riboflavin) vs. Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B2 (Riboflavin)
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Vitamin B2 is an essential water-soluble isoalloxazine vitamin serving as the core structural component of Flavin Mononucleotide (FMN) and Flavin Adenine Dinucleotide (FAD) coenzymes in cellular redox respiration. Adult RDA is 1.3 mg (men) / 1.1 mg (women).
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 Isoalloxazine Vitamin | Water-Soluble Pyridine Vitamin |
|
Adult RDA / RDI
|
1.3 mg / day (Men) / 1.1 mg / day (Women) | 16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) |
|
Tolerable Upper Limit (UL)
|
None Established (Saturates intestinal absorption at ~27mg; excreted as harmless bright yellow urine) | 35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) |
|
Chemical Forms
|
Riboflavin, Riboflavin-5'-Phosphate (FMN), Flavin Adenine Dinucleotide (FAD) | Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) |
|
Primary Biological Function
|
Complex I and Complex II mitochondrial electron transport chain cytochromes, Glutathione Reductase, B6/Folate activation | NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation |
|
Deficiency Condition
|
Ariboflavinosis (Angular cheilitis / cracked lip corners, glossitis / magenta tongue, seborrheic dermatitis) | Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) |
|
Top Whole Food Sources
|
Beef Liver, Dairy Milk, Greek Yogurt, Eggs, Almonds, Portobello Mushrooms, Spinach | Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms |
|
Photodegradation Vulnerability
|
Extremely light-sensitive (dairy milk stored in clear glass loses 50% riboflavin within 2 hours of sunlight exposure) | — |
|
Tryptophan Biosynthesis Pathway
|
— | 60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) |
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