Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin A (Retinol & Beta-Carotene) vs. Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin A (Retinol & Beta-Carotene)
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
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 B6 is a water-soluble pyridine vitamin acting via its active coenzyme Pyridoxal 5'-Phosphate (PLP) in over 140 amino acid decarboxylation, transamination, and neurotransmitter synthesis reactions. Adult RDA is 1.3–1.7 mg, with a Tolerable Upper Limit of 100 mg/day.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Fat-Soluble Isoprenoid Vitamin | Water-Soluble Pyridine Vitamin |
|
Adult RDA / RDI
|
900 µg RAE / day (Men) / 700 µg RAE / day (Women) | 1.3 mg / day (Adults 19–50) / 1.7 mg (Men 51+) / 1.5 mg (Women 51+) |
|
Tolerable Upper Limit (UL)
|
3,000 µg / day (10,000 IU) (Preformed retinol only; no UL for beta-carotene) | 100 mg / day (US FDA/NIH) / 12 mg / day (EFSA, revised down from 25mg in 2023) (Avoid sensory peripheral neuropathy) |
|
Chemical Forms
|
Retinyl Palmitate (Preformed Animal), All-Trans Retinol, Beta-Carotene (Plant Provitamin) | Pyridoxal 5'-Phosphate (PLP, active coenzyme), Pyridoxine HCl, Pyridoxamine |
|
Primary Biological Function
|
11-cis-retinal rhodopsin visual cycle, RAR/RXR nuclear receptor gene transcription, Mucosal barrier immunity | Transamination / deamination of amino acids, Serotonin / Dopamine / GABA synthesis from amino acids, Glycogen phosphorylase cofactor, Heme synthesis |
|
Deficiency Condition
|
Nyctalopia (Night blindness), Xerophthalmia, Bitot's spots, Keratinization of mucous membranes | Microcytic sideroblastic anemia, Seborrheic dermatitis, Cheilosis, Peripheral neuropathy, Convulsions |
|
Top Whole Food Sources
|
Beef Liver, Cod Liver Oil, Sweet Potatoes, Carrots, Spinach, Curly Kale, Butter | Chickpeas, Wild Salmon, Yellowfin Tuna, Beef Liver, Chicken Breast, Russet Potatoes, Bananas |
|
Hepatic Storage
|
80–90% of total body Vitamin A is stored in hepatic stellate cells as retinyl esters | — |
|
Neurotoxicity Threshold
|
— | Chronic megadosing of Pyridoxine HCl (>200–500mg/day) causes reversible sensory neuropathy due to competitive inhibition of tissue PLP |
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