Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B12 (Cobalamin) vs. Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B12 (Cobalamin)
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Vitamin B12 is a cobalt-containing water-soluble corrinoid synthesized exclusively by microorganisms. Adult RDA is 2.4µg/day (no Upper Limit established), required for DNA synthesis, methionine synthase homocysteine conversion, and myelin sheath maintenance.
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
|
Water-Soluble Corrinoid Vitamin | Water-Soluble Pyridine Vitamin |
|
Adult RDA / RDI
|
2.4 µg / day (2.6µg pregnancy, 2.8µg lactation) | 1.3 mg / day (Adults 19–50) / 1.7 mg (Men 51+) / 1.5 mg (Women 51+) |
|
Tolerable Upper Limit (UL)
|
None Established (Extremely low toxicity) | 100 mg / day (US FDA/NIH) / 12 mg / day (EFSA, revised down from 25mg in 2023) (Avoid sensory peripheral neuropathy) |
|
Chemical Forms
|
Methylcobalamin (Active), Adenosylcobalamin (Active), Cyanocobalamin (Stable synthetic) | Pyridoxal 5'-Phosphate (PLP, active coenzyme), Pyridoxine HCl, Pyridoxamine |
|
Primary Biological Function
|
Methionine synthase cofactor, Methylmalonyl-CoA mutase cofactor, Myelin integrity, Erythropoiesis | Transamination / deamination of amino acids, Serotonin / Dopamine / GABA synthesis from amino acids, Glycogen phosphorylase cofactor, Heme synthesis |
|
Deficiency Condition
|
Pernicious / Megaloblastic Anemia, Irreversible Neurological Peripheral Neuropathy | Microcytic sideroblastic anemia, Seborrheic dermatitis, Cheilosis, Peripheral neuropathy, Convulsions |
|
Top Whole Food Sources
|
Oysters, Beef Liver, Sardines, Salmon, Beef, Dairy, Eggs (Absent in unfortified plant foods) | Chickpeas, Wild Salmon, Yellowfin Tuna, Beef Liver, Chicken Breast, Russet Potatoes, Bananas |
|
Absorption Mechanism
|
Requires Gastric Acid, R-Protein, and Intrinsic Factor (IF) via Ileal Cubam receptors | — |
|
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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