Started before conception and continued through the first trimester without exception.
What the evidence supports: preventing neural tube defects — among the strongest evidence in nutrition.
This scores how well-supported the claim above is — not how much benefit you personally would get. A high score on a narrow claim does not extend to everything the product is marketed for.
From at least one month before conception through the first trimester, and often throughout pregnancy.
Anyone who could become pregnant. Neural tube closure happens before most people know they're pregnant.
Other supplements:
Run your full list through the interaction check.