Correct a measured deficiency; can mask B12 deficiency if taken alone.
TrustedSupp Tier System™ · Tier 2Take until levels correct
Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.
Evidence strength
94/100Very strong
WEAKLIMITEDMODERATESTRONGVERY STRONG
What the evidence supports: correcting deficiency and preventing neural tube defects.
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.
How long to take it
Course-based outside pregnancy.
Who it's actually for
Pregnancy planning, malabsorption, and certain medications.
Safe upper limit
Verified
1,000 mcg per day of supplemental folic acid
The limit exists specifically because folate hides B12 deficiency while nerve damage progresses.