Side-by-Side Comparison
Essential Vitamins & Minerals
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP) vs. Vitamin B9 (Folate & Folic Acid)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Vitamin B6 (Pyridoxal 5'-Phosphate / PLP)
Vitamin B9 (Folate & Folic Acid)
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 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
|
Water-Soluble Pyridine Vitamin | Water-Soluble Pteroylglutamate Vitamin |
|
Adult RDA / RDI
|
1.3 mg / day (Adults 19–50) / 1.7 mg (Men 51+) / 1.5 mg (Women 51+) | 400 µg DFE / day (600 µg DFE pregnancy / prevents neural tube defects) |
|
Tolerable Upper Limit (UL)
|
100 mg / day (US FDA/NIH) / 12 mg / day (EFSA, revised down from 25mg in 2023) (Avoid sensory peripheral neuropathy) | 1,000 µg / day (Synthetic folic acid only; masks B12 deficiency neuropathy) |
|
Chemical Forms
|
Pyridoxal 5'-Phosphate (PLP, active coenzyme), Pyridoxine HCl, Pyridoxamine | (6S)-5-Methyltetrahydrofolate (5-MTHF, active circulating form), Tetrahydrofolate (THF), Folic Acid (Pteroylmonoglutamic acid, synthetic) |
|
Primary Biological Function
|
Transamination / deamination of amino acids, Serotonin / Dopamine / GABA synthesis from amino acids, Glycogen phosphorylase cofactor, Heme synthesis | 1-Carbon transfer reactions, dUMP -> dTMP methylation (Thymidine DNA synthesis), Methionine-Homocysteine cycle, Erythropoiesis |
|
Deficiency Condition
|
Microcytic sideroblastic anemia, Seborrheic dermatitis, Cheilosis, Peripheral neuropathy, Convulsions | Neural Tube Defects (Spina bifida, anencephaly in fetuses), Megaloblastic Macrocytic Anemia, Elevated Homocysteine |
|
Top Whole Food Sources
|
Chickpeas, Wild Salmon, Yellowfin Tuna, Beef Liver, Chicken Breast, Russet Potatoes, Bananas | Beef Liver, Spinach, Asparagus, Brussels Sprouts, Roman Lentils, Chickpeas, Fortified Flours |
|
Neurotoxicity Threshold
|
Chronic megadosing of Pyridoxine HCl (>200–500mg/day) causes reversible sensory neuropathy due to competitive inhibition of tissue PLP | — |
|
MTHFR Genetic Polymorphism
|
— | Homozygous MTHFR C677T variant reduces folate reduction activity by ~70%, benefiting from direct 5-MTHF supplementation |
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