Vitamin B6 is an essential water-soluble vitamin that acts as a coenzyme in over 100 metabolic reactions, primarily related to amino acid metabolism. For healthspan, its most critical role is in the pathway that converts homocysteine to cysteine, helping to keep homocysteine levels low. Elevated homocysteine is a well-established risk factor for cardiovascular disease, stroke, and cognitive decline, making B6 a key component of metabolic and neurological maintenance.
Verdict
Ensure dietary sufficiency; supplement cautiously, avoiding chronic high doses.
HEALTHSPAN IMPACT
Moderate
RISK LEVEL
Low
EVIDENCE GRADE
B
MONTHLY COST
$5 - $15
Protocol
- Daily intake of 25-50 mg, often as the active form Pyridoxal-5-Phosphate (P-5-P).
- Ensure intake meets the RDA of 1.3-1.7 mg/day through diet or supplementation.
Flags
- Chronic high doses (>100 mg/day) are associated with a significant risk of peripheral neuropathy.
- May interfere with the efficacy of certain drugs, including levodopa, phenobarbital, and phenytoin.
- The pyridoxal 5'-phosphate (P-5-P) form is often preferred for better bioavailability.
- Deficiency is rare but can be a concern with certain medical conditions or diets.