BioStacksBest Vitamin B9 for Pregnancy
Top 10 products ranked
Clinical dose: 400–800 mcg
Vitamin B9 and pregnancy
For pregnancy support, Vitamin B9 is a key ingredient backed by research. Critical for DNA synthesis, cell division, and methylation reactions. 5-MTHF (methylfolate) is the bioactive form that the body can use directly, unlike synthetic folic acid which requires multi-step conversion via the MTHFR enzyme.
How much vitamin b9 do you need
Research points to 400–800 mcg as the effective range for vitamin b9. Lower doses may provide some benefit, but most studies showing clear results used this range.
Which form absorbs best
Avoid folic acid — synthetic, ~60% conversion rate. The most bioavailable options are methylfolate (5-mthf).
What the research says
The clinical evidence for vitamin b9 in pregnancy is strong. Strong evidence for neural tube defect prevention; 40-50% of people have MTHFR variants affecting conversion Learn more
Thorne
Basic Prenatal, 90 Capsules
Mixed forms · 1700 mcg
Super Nutrition
Simply One, Prenatal Multivitamin with Super Greens, Spices, Vitamin A, and Folate, 90 Tablets
methyltetrahydrofolate · 1200 mcg
Life Extension
BioActive Complete B-Complex
methyltetrahydrofolate · 680 mcg
NOW
Methyl Folate 1,000 mcg
quatrefolic · 1000 mcg
Thorne
Basic B Complex
Mixed forms · 667 mcg
NOW Foods
Methyl Folate, 1,000 mcg, 180 Tablets
Mixed forms · 1700 mcg
Jarrow Formulas
Vegan Methyl Folate, 400 mcg, 60 Veggie Capsules
5-mthf · 680 mcg
Sports Research
Advanced Vitamin B Complex, 180 Veggie Softgels
methyltetrahydrofolic · 680 mcg
Doctor's Best
Fully Active B Complex with Quatrefolic
quatrefolic · 400 mcg
BrainMD
Serotonin Mood Support, 120 Vegan Capsules
Mixed forms · 400 mcg