Best Vitamin B12 for Pregnancy
Top 4 products ranked
Last reviewed May 2026
Clinical dose: 250–5000 mcg
Why Vitamin B12 for Pregnancy
Vitamin B12 plays a supporting role in pregnancy. Essential for nerve function, DNA synthesis, and red blood cell formation. Methylcobalamin and adenosylcobalamin are the two naturally active coenzyme forms, while cyanocobalamin is synthetic and requires conversion.
What dose to look for
Clinical studies typically use 250–5000 mcg of vitamin b12. RDA is 2.4 mcg but supplements typically provide 250–5000 mcg due to low absorption. Products below this range may not deliver meaningful results.
What form to look for
Avoid cyanocobalamin — synthetic, requires conversion. Look for methylcobalamin or adenosylcobalamin for better absorption.
What the research says
Vitamin B12 has strong clinical evidence for pregnancy benefits. Essential for nerve function and red blood cell formation; deficiency common in vegans and adults over 50 Learn more
Super Nutrition
Simply One, Prenatal Multivitamin with Super Greens, Spices, Vitamin A, and Folate, 90 Tablets
methylcobalamin · 5.6 mcg
Thorne
Basic Prenatal, 90 Capsules
methylcobalamin · 200 mcg
Nature Made
Prenatal Folic Acid + DHA
cyanocobalamin · 5.2 mcg
Solgar
Prenatal Nutrients
cyanocobalamin · 8 mcg