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B9
Vitamins
Folate (Folic Acid / Methylfolate Products)
Critical for DNA synthesis; high folic acid can mask B12 deficiency.
What it is
Folate supports cell division and is essential in pregnancy; excessive folic acid can mask B12 deficiency.
How it works
One‑carbon metabolism and nucleotide synthesis; high folic acid may conceal hematologic signs of B12 deficiency.
What the evidence says
Strong evidence for appropriate periconceptional folate; key safety issue is masking B12 deficiency at high doses.
Safety Notes
- UL (1,000 mcg/day) applies to folic acid (synthetic), not naturally occurring food folate.
- Use caution with: untreated vitamin B12 deficiency.
Timing With Other Supplements
- Vitamin B12 (Cobalamin): High folic acid can mask B12 deficiency; ensure B12 adequacy.