Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP) vs. Vitamin D3 (Cholecalciferol)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Vitamin D3 (Cholecalciferol)
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.
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.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Water-Soluble Pyridine Vitamin | Fat-Soluble Secosteroid Prohormone |
|
Adult RDA / RDI
|
1.3 mg / day (Adults 19–50) / 1.7 mg (Men 51+) / 1.5 mg (Women 51+) | 600 – 800 IU / day (15 – 20 µg) |
|
Tolerable Upper Limit (UL)
|
100 mg / day (US FDA/NIH) / 12 mg / day (EFSA, revised down from 25mg in 2023) (Avoid sensory peripheral neuropathy) | 4,000 IU / day (100 µg) (Endocrine Society: up to 10,000 IU safe) |
|
Chemical Forms
|
Pyridoxal 5'-Phosphate (PLP, active coenzyme), Pyridoxine HCl, Pyridoxamine | Cholecalciferol (D3 - Animal/Lichen), Ergocalciferol (D2 - Fungi) |
|
Primary Biological Function
|
Transamination / deamination of amino acids, Serotonin / Dopamine / GABA synthesis from amino acids, Glycogen phosphorylase cofactor, Heme synthesis | Calcitriol receptor (VDR) activation, intestinal calcium/phosphorus absorption, antimicrobial peptide synthesis |
|
Deficiency Condition
|
Microcytic sideroblastic anemia, Seborrheic dermatitis, Cheilosis, Peripheral neuropathy, Convulsions | Rickets (children), Osteomalacia (adults), Immune dysregulation |
|
Top Whole Food Sources
|
Chickpeas, Wild Salmon, Yellowfin Tuna, Beef Liver, Chicken Breast, Russet Potatoes, Bananas | Sunlight UVB, Atlantic Salmon, Sardines, Egg Yolk, Fortified Milk |
|
Neurotoxicity Threshold
|
Chronic megadosing of Pyridoxine HCl (>200–500mg/day) causes reversible sensory neuropathy due to competitive inhibition of tissue PLP | — |
|
Target Serum 25(OH)D Level
|
— | 30 – 50 ng / mL (75 – 125 nmol / L) |
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