Side-by-Side Comparison
Essential Vitamins & Minerals
Iron (Heme & Non-Heme) vs. Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Iron (Heme & Non-Heme)
Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide)
Iron is an essential redox trace element central to hemoglobin oxygen transport, myoglobin storage, and mitochondrial electron transport chain cytochromes. Adult RDA is 8mg (men/post-menopausal women) / 18mg (pre-menopausal women), with a Tolerable Upper Limit of 45mg/day.
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
|
Essential Trace Mineral | Water-Soluble Pyridine Vitamin |
|
Adult RDA / RDI
|
8 mg (Men) / 18 mg (Women 19–50) / 27 mg (Pregnancy) | 16 mg NE / day (Men) / 14 mg NE / day (Women) (NE = Niacin Equivalents) |
|
Tolerable Upper Limit (UL)
|
45 mg / day (Hemochromatosis / Fenton reaction oxidative stress) | 35 mg / day (Supplemental nicotinic acid; prevents prostaglandin flushing) |
|
Chemical Forms
|
Heme Iron (Fe2+ Porphyrin - Animal), Non-Heme Iron (Fe3+ Ferric / Fe2+ Ferrous - Plants/Supplements) | Nicotinamide (Niacinamide), Nicotinic Acid, Nicotinamide Riboside (NR), Nicotinamide Mononucleotide (NMN) |
|
Primary Biological Function
|
Hemoglobin O2 transport, Myoglobin O2 storage, Cytochrome c electron transport, Catalase | NAD+/NADH redox electron carrier in glycolysis/TCA cycle, NADP+/NADPH reductive biosynthesis, PARP-1 DNA repair, Sirtuin activation |
|
Deficiency Condition
|
Microcytic Hypochromic Anemia, Severe fatigue, Restless legs syndrome, Pica | Pellagra ('The 4 Ds': Diarrhea, Dermatitis on sun-exposed skin, Dementia, Death) |
|
Top Whole Food Sources
|
Beef Liver, Oysters, Duck Breast, Beef Ribeye, Lentils, Spinach, Dark Chocolate | Chicken Breast, Canned Tuna, Salmon, Beef, Turkey, Peanuts, Brown Rice, Shiitake Mushrooms |
|
Bioavailability Difference
|
Heme: 15–35% absorption (uninhibited); Non-Heme: 2–20% (inhibited by phytates/calcium, boosted by Vitamin C) | — |
|
Tryptophan Biosynthesis Pathway
|
— | 60 mg of dietary amino acid L-tryptophan converts endogenously into 1 mg of niacin (1 NE) |
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