Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin A (Retinol & Beta-Carotene) vs. Vitamin B9 (Folate & Folic Acid)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin A (Retinol & Beta-Carotene)
Vitamin B9 (Folate & Folic Acid)
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 B9 comprises natural dietary folates (polyglutamates) and synthetic folic acid (monoglutamate). Adult RDA is 400 µg DFE, with a Tolerable Upper Limit of 1,000 µg/day synthetic folic acid, essential as a single-carbon donor in thymidylate DNA synthesis and neural tube closure.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Fat-Soluble Isoprenoid Vitamin | Water-Soluble Pteroylglutamate Vitamin |
|
Adult RDA / RDI
|
900 µg RAE / day (Men) / 700 µg RAE / day (Women) | 400 µg DFE / day (600 µg DFE pregnancy / prevents neural tube defects) |
|
Tolerable Upper Limit (UL)
|
3,000 µg / day (10,000 IU) (Preformed retinol only; no UL for beta-carotene) | 1,000 µg / day (Synthetic folic acid only; masks B12 deficiency neuropathy) |
|
Chemical Forms
|
Retinyl Palmitate (Preformed Animal), All-Trans Retinol, Beta-Carotene (Plant Provitamin) | (6S)-5-Methyltetrahydrofolate (5-MTHF, active circulating form), Tetrahydrofolate (THF), Folic Acid (Pteroylmonoglutamic acid, synthetic) |
|
Primary Biological Function
|
11-cis-retinal rhodopsin visual cycle, RAR/RXR nuclear receptor gene transcription, Mucosal barrier immunity | 1-Carbon transfer reactions, dUMP -> dTMP methylation (Thymidine DNA synthesis), Methionine-Homocysteine cycle, Erythropoiesis |
|
Deficiency Condition
|
Nyctalopia (Night blindness), Xerophthalmia, Bitot's spots, Keratinization of mucous membranes | Neural Tube Defects (Spina bifida, anencephaly in fetuses), Megaloblastic Macrocytic Anemia, Elevated Homocysteine |
|
Top Whole Food Sources
|
Beef Liver, Cod Liver Oil, Sweet Potatoes, Carrots, Spinach, Curly Kale, Butter | Beef Liver, Spinach, Asparagus, Brussels Sprouts, Roman Lentils, Chickpeas, Fortified Flours |
|
Hepatic Storage
|
80–90% of total body Vitamin A is stored in hepatic stellate cells as retinyl esters | — |
|
MTHFR Genetic Polymorphism
|
— | Homozygous MTHFR C677T variant reduces folate reduction activity by ~70%, benefiting from direct 5-MTHF supplementation |
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