Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide) vs. Vitamin B9 (Folate & Folic Acid)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Vitamin B9 (Folate & Folic Acid)
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 B9 comprises natural dietary folates (polyglutamates) and synthetic folic acid (monoglutamate). Adult RDA is 400 µg DFE, with a Tolerable Upper Limit of 1,000 µg/day synthetic folic acid, essential as a single-carbon donor in thymidylate DNA synthesis and neural tube closure.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Water-Soluble Pyridine Vitamin | Water-Soluble Pteroylglutamate Vitamin |
|
Adult RDA / RDI
|
16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) | 400 µg DFE / day (600 µg DFE pregnancy / prevents neural tube defects) |
|
Tolerable Upper Limit (UL)
|
35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) | 1,000 µg / day (Synthetic folic acid only; masks B12 deficiency neuropathy) |
|
Chemical Forms
|
Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) | (6S)-5-Methyltetrahydrofolate (5-MTHF, active circulating form), Tetrahydrofolate (THF), Folic Acid (Pteroylmonoglutamic acid, synthetic) |
|
Primary Biological Function
|
NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation | 1-Carbon transfer reactions, dUMP -> dTMP methylation (Thymidine DNA synthesis), Methionine-Homocysteine cycle, Erythropoiesis |
|
Deficiency Condition
|
Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) | Neural Tube Defects (Spina bifida, anencephaly in fetuses), Megaloblastic Macrocytic Anemia, Elevated Homocysteine |
|
Top Whole Food Sources
|
Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms | Beef Liver, Spinach, Asparagus, Brussels Sprouts, Roman Lentils, Chickpeas, Fortified Flours |
|
Tryptophan Biosynthesis Pathway
|
60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) | — |
|
MTHFR Genetic Polymorphism
|
— | Homozygous MTHFR C677T variant reduces folate reduction activity by ~70%, benefiting from direct 5-MTHF supplementation |
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