Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin D3 (Cholecalciferol) vs. Vitamin E (d-Alpha-Tocopherol)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin D3 (Cholecalciferol)
Vitamin E (d-Alpha-Tocopherol)
Vitamin D3 is a secosteroid prohormone synthesized endogenously in skin via solar UVB irradiation of 7-dehydrocholesterol. Adult RDA is 600–800 IU (15–20µg), with a Tolerable Upper Limit of 4,000 IU (100µg)/day, regulating systemic calcium absorption and immune gene expression.
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 Secosteroid Prohormone | Fat-Soluble Chromanol Lipophilic Vitamin |
|
Adult RDA / RDI
|
600 – 800 IU / day (15 – 20 µg) | 15 mg / day (22.4 IU) of 2R-alpha-tocopherol |
|
Tolerable Upper Limit (UL)
|
4,000 IU / day (100 µg) (Endocrine Society: up to 10,000 IU safe) | 1,000 mg / day (1,500 IU synthetic) (Excess impairs Vitamin K clotting cascade) |
|
Chemical Forms
|
Cholecalciferol (D3 - Animal/Lichen), Ergocalciferol (D2 - Fungi) | RRR-alpha-Tocopherol (Natural d-alpha), all-rac-alpha-Tocopherol (Synthetic dl-alpha), Gamma/Delta-Tocopherols |
|
Primary Biological Function
|
Calcitriol receptor (VDR) activation, intestinal calcium/phosphorus absorption, antimicrobial peptide synthesis | Breaks lipid peroxidation chain in PUFA cell membranes, protects LDL from oxidative modification, maintains erythrocyte membrane integrity |
|
Deficiency Condition
|
Rickets (children), Osteomalacia (adults), Immune dysregulation | Hemolytic anemia, Spinocerebellar ataxia, Peripheral neuropathy, Loss of vibratory/proprioceptive sense |
|
Top Whole Food Sources
|
Sunlight UVB, Atlantic Salmon, Sardines, Egg Yolk, Fortified Milk | Wheat Germ Oil, Sunflower Seeds, Raw Almonds, Hazelnuts, Sunflower Oil, Spinach, Hass Avocado |
|
Target Serum 25(OH)D Level
|
30 – 50 ng / mL (75 – 125 nmol / L) | — |
|
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 |
Other Alternatives to Compare
Compare Vitamin D3 (Cholecalciferol) vs. Calcium (Elemental Ca) →
Compare Vitamin D3 (Cholecalciferol) vs. Iodine (Elemental I) →
Compare Vitamin D3 (Cholecalciferol) vs. Iron (Heme & Non-Heme) →
Compare Vitamin D3 (Cholecalciferol) vs. Magnesium (Elemental Mg) →
Compare Vitamin D3 (Cholecalciferol) vs. Potassium (Elemental K) →
Compare Vitamin D3 (Cholecalciferol) vs. Selenium (Elemental Se) →
Compare Vitamin D3 (Cholecalciferol) vs. Sodium (Elemental Na) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin A (Retinol & Beta-Carotene) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B1 (Thiamine) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B12 (Cobalamin) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B2 (Riboflavin) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B5 (Pantothenic Acid) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B6 (Pyridoxal 5'-Phosphate / PLP) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B7 (Biotin / Vitamin H) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin B9 (Folate & Folic Acid) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin C (L-Ascorbic Acid) →
Compare Vitamin D3 (Cholecalciferol) vs. Vitamin K1 (Phylloquinone) →
Compare Vitamin D3 (Cholecalciferol) vs. Zinc (Elemental Zn) →