Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin A (Retinol & Beta-Carotene) vs. Vitamin E (d-Alpha-Tocopherol)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin A (Retinol & Beta-Carotene)
Vitamin E (d-Alpha-Tocopherol)
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 E is the principal fat-soluble peroxyl radical-scavenging antioxidant protecting cellular polyunsaturated membrane phospholipids. Adult RDA is 15 mg (22.4 IU) of d-alpha-tocopherol, with a Tolerable Upper Limit of 1,000 mg (1,500 IU)/day.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Fat-Soluble Isoprenoid Vitamin | Fat-Soluble Chromanol Lipophilic Vitamin |
|
Adult RDA / RDI
|
900 µg RAE / day (Men) / 700 µg RAE / day (Women) | 15 mg / day (22.4 IU) of 2R-alpha-tocopherol |
|
Tolerable Upper Limit (UL)
|
3,000 µg / day (10,000 IU) (Preformed retinol only; no UL for beta-carotene) | 1,000 mg / day (1,500 IU synthetic) (Excess impairs Vitamin K clotting cascade) |
|
Chemical Forms
|
Retinyl Palmitate (Preformed Animal), All-Trans Retinol, Beta-Carotene (Plant Provitamin) | RRR-alpha-Tocopherol (Natural d-alpha), all-rac-alpha-Tocopherol (Synthetic dl-alpha), Gamma/Delta-Tocopherols |
|
Primary Biological Function
|
11-cis-retinal rhodopsin visual cycle, RAR/RXR nuclear receptor gene transcription, Mucosal barrier immunity | Breaks lipid peroxidation chain in PUFA cell membranes, protects LDL from oxidative modification, maintains erythrocyte membrane integrity |
|
Deficiency Condition
|
Nyctalopia (Night blindness), Xerophthalmia, Bitot's spots, Keratinization of mucous membranes | Hemolytic anemia, Spinocerebellar ataxia, Peripheral neuropathy, Loss of vibratory/proprioceptive sense |
|
Top Whole Food Sources
|
Beef Liver, Cod Liver Oil, Sweet Potatoes, Carrots, Spinach, Curly Kale, Butter | Wheat Germ Oil, Sunflower Seeds, Raw Almonds, Hazelnuts, Sunflower Oil, Spinach, Hass Avocado |
|
Hepatic Storage
|
80–90% of total body Vitamin A is stored in hepatic stellate cells as retinyl esters | — |
|
Hepatic Alpha-TTP Specificity
|
— | The liver secretes only alpha-tocopherol into VLDL via Alpha-Tocopherol Transfer Protein (alpha-TTP); other tocopherols are degraded in bile |
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