Best Vitamin B9 (Folic Acid) Supplements AI pick
Chosen by an AI model from its trained knowledge, with its reasoning.
AI pick (line): Nature Made Folic Acid
The 400 mcg folic acid dose recommended for anyone who could become pregnant, in the form backed by neural tube defect prevention evidence.
Not for: People prescribed higher doses after a previous neural tube defect, and anyone with untreated B12 deficiency.
AI picks by need
For prefer methylfolate
Thorne 5-MTHF (line)
An active folate that skips the conversion step.
Not for: People wanting the form used in the pregnancy outcome trials.
What the AI looks for in Vitamin B9 (Folic Acid) Supplements
- Pregnancy dose
- 400 mcg of folic acid a day, starting at least one month before conception. The neural tube closes very early in pregnancy.
- Upper limit
- No more than 1,000 mcg of folic acid a day from supplements unless prescribed. Higher doses can mask B12-deficiency anemia.
- Labeling
- Labels list mcg DFE. 400 mcg of folic acid equals about 680 mcg DFE. This explains the confusingly larger numbers on labels.
Brands that matter
- Nature Made: Low-cost folic acid.
- Thorne: Methylfolate.
- Pure Encapsulations: Folate options.
What to avoid
- Megadose methylfolate products taken without reason.
- Doubling up with a prenatal that already contains folate.
Questions
Do MTHFR carriers need methylfolate?
Folic acid at standard doses is still effective for most carriers. Methylfolate is an optional alternative.