Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin A (Retinol & Beta-Carotene) vs. Vitamin B2 (Riboflavin)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin A (Retinol & Beta-Carotene)
Vitamin B2 (Riboflavin)
Vitamin A is an essential fat-soluble isoprenoid comprising preformed retinol and provitamin A carotenoids. Adult RDA is 900 µg RAE (men) / 700 µg RAE (women), with a Tolerable Upper Limit of 3,000 µg/day preformed retinol, essential for rhodopsin retinal photoreception, epithelial differentiation, and immune cell proliferation.
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).
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Fat-Soluble Isoprenoid Vitamin | Water-Soluble Isoalloxazine Vitamin |
|
Adult RDA / RDI
|
900 µg RAE / day (Men) / 700 µg RAE / day (Women) | 1.3 mg / day (Men) / 1.1 mg / day (Women) |
|
Tolerable Upper Limit (UL)
|
3,000 µg / day (10,000 IU) (Preformed retinol only; no UL for beta-carotene) | None Established (Saturates intestinal absorption at ~27mg; excreted as harmless bright yellow urine) |
|
Chemical Forms
|
Retinyl Palmitate (Preformed Animal), All-Trans Retinol, Beta-Carotene (Plant Provitamin) | Riboflavin, Riboflavin-5'-Phosphate (FMN), Flavin Adenine Dinucleotide (FAD) |
|
Primary Biological Function
|
11-cis-retinal rhodopsin visual cycle, RAR/RXR nuclear receptor gene transcription, Mucosal barrier immunity | Complex I and Complex II mitochondrial electron transport chain cytochromes, Glutathione Reductase, B6/Folate activation |
|
Deficiency Condition
|
Nyctalopia (Night blindness), Xerophthalmia, Bitot's spots, Keratinization of mucous membranes | Ariboflavinosis (Angular cheilitis / cracked lip corners, glossitis / magenta tongue, seborrheic dermatitis) |
|
Top Whole Food Sources
|
Beef Liver, Cod Liver Oil, Sweet Potatoes, Carrots, Spinach, Curly Kale, Butter | Beef Liver, Dairy Milk, Greek Yogurt, Eggs, Almonds, Portobello Mushrooms, Spinach |
|
Hepatic Storage
|
80–90% of total body Vitamin A is stored in hepatic stellate cells as retinyl esters | — |
|
Photodegradation Vulnerability
|
— | Extremely light-sensitive (dairy milk stored in clear glass loses 50% riboflavin within 2 hours of sunlight exposure) |
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