Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin A (Retinol & Beta-Carotene) vs. Vitamin B1 (Thiamine)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin A (Retinol & Beta-Carotene)
Vitamin B1 (Thiamine)
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 B1 is a water-soluble pyrimidine/thiazole vitamin acting as the Thiamine Pyrophosphate (TPP) coenzyme in pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, and transketolase. Adult RDA is 1.2 mg (men) / 1.1 mg (women) (no Upper Limit established).
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Fat-Soluble Isoprenoid Vitamin | Water-Soluble Thiazole Vitamin |
|
Adult RDA / RDI
|
900 µg RAE / day (Men) / 700 µg RAE / day (Women) | 1.2 mg / day (Men) / 1.1 mg / day (Women) (+0.3mg during pregnancy) |
|
Tolerable Upper Limit (UL)
|
3,000 µg / day (10,000 IU) (Preformed retinol only; no UL for beta-carotene) | None Established (Rapid renal clearance of excess) |
|
Chemical Forms
|
Retinyl Palmitate (Preformed Animal), All-Trans Retinol, Beta-Carotene (Plant Provitamin) | Thiamine Monophosphate, Thiamine Pyrophosphate (TPP / TDP, active coenzyme), Benfotiamine (Lipid-soluble synthetic) |
|
Primary Biological Function
|
11-cis-retinal rhodopsin visual cycle, RAR/RXR nuclear receptor gene transcription, Mucosal barrier immunity | Pyruvate dehydrogenase complex (Links glycolysis to Krebs cycle), Transketolase (Pentose Phosphate Pathway), Myelin neurotransmission |
|
Deficiency Condition
|
Nyctalopia (Night blindness), Xerophthalmia, Bitot's spots, Keratinization of mucous membranes | Beriberi (Wet beriberi: high-output heart failure; Dry beriberi: peripheral neuropathy), Wernicke-Korsakoff syndrome |
|
Top Whole Food Sources
|
Beef Liver, Cod Liver Oil, Sweet Potatoes, Carrots, Spinach, Curly Kale, Butter | Pork Tenderloin, Sunflower Seeds, Nutritional Yeast, Enriched Grains, Black Beans, Flaxseeds |
|
Hepatic Storage
|
80–90% of total body Vitamin A is stored in hepatic stellate cells as retinyl esters | — |
|
Thermolability & Alcohol Interaction
|
— | Degraded by alkaline pH and high heat cooking; alcohol blocks intestinal active ThTr-1 transport |
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