What do the states mean?+
- Solid: well studied, and it works.
- Half-there: the science is still forming.
- A ghost: almost no real studies.
- Hollow: well studied, and it does not work.
- A cord: the pair itself has been tested together.
- Air: nobody has ever tested this pair.
The full scoring method: How we score
Folate benefits: where the science stands
For pregnancy and birth defects: yes.
Pregnancy and birth defects are what most people take folate for, and the strongest evidence says it helps (a combined review covering 5 trials). As of August 2026, the verdicts on this page rest on evidence from 37 trials, drawn from the strongest research among the 8,833 papers on PubMed that mention folate. Every claim is checked below.
8,833 papers on PubMed · evidence from 37 trials
Claim by claim
- Pregnancy and birth defectsWell studied, and it works. The biggest review covered 5 trials.
- HeartWell studied, and it works. The biggest review covered 11 trials.
- MoodWell studied, and it works. The biggest review covered 20 trials.
- Nerve painWell studied, and it works. Tested in 1,367 people.
Pairs people ask about
The four sources we read
- 2015Meta-analysis · pools 5 trials, 7,391 people · large benefit for pregnancy and birth defectssource
- 2017Meta-analysis · pools 11 trials, 65,790 people · small benefit for heartsource
- 2023Meta-analysis · pools 20 trials, 2,256 people · moderate benefit for moodsource
- 2025Meta-analysis · 1,367 people · moderate benefit for nerve painsource
Chosen as the strongest evidence out of 8,833 papers on PubMed. Every row links to its paper.
Fair questions
Does folate work?+
For pregnancy and birth defects, yes. The biggest review covered 5 trials.
Is folate safe?+
No caution is recorded on this page. That is not a safety guarantee; the studies we read were not safety trials.
Why only 4 sources, when PubMed lists 8,833?+
The 8,833 is every paper that mentions folate in any way: animal studies, blood measurements, papers where it is a side note. The strongest sources are combined reviews, and each one already gathers every trial its authors could find. Our 4 cover 37 trials between them, and every one is linked above. Both counts are measured, not estimated.