image bio

Love your body from the inside, out with an extra 10% off your first order of vitamin & supplement subscriptions with code LOVE23. Shop Now ➔

Home > Learn > Nutrition > >The Role of B Vitamins During Pregnancy

The Role of B Vitamins During Pregnancy

Jan 04, 21 52 min
The Role of B Vitamins During Pregnancy

There are eight B vitamins, collectively referred to as the vitamin B complex, and they are a critical component of prenatal nutrition. In this guide, we’ll discuss all eight B vitamins, including which ones to look for in a prenatal. 

By Dr. Kenosha Gleaton

You have probably heard of biotin (B7), folate (B9), and B12 (cobalamin), but may be less familiar with pyridoxine (B6) and thiamin (B1). All these nutrients are part of the B vitamin family. There are eight B vitamins, collectively referred to as the vitamin B complex, and they are a critical component of prenatal nutrition. In this guide, we’ll discuss all eight B vitamins, including which ones to look for in a prenatal.

What are B vitamins?

B vitamins help your body convert food into energy and also help form red blood cells. They are a class of water-soluble vitamins, meaning they are readily absorbed into your body for immediate use. Because they are not stored in the body (like calcium), they need to be replenished regularly via diet and supplements. 
Let’s look at all of the B vitamins and their recommended intake:

  • Vitamin B1 (thiamin)
    • The RDA (Recommended Dietary Allowance) for females over 19 is 1.1mg and 1.4 mg during pregnancy.
  • Vitamin B2 (riboflavin)
    • RDA for females 19+ is 1.1 mg and 1.4 mg during pregnancy.
  • Vitamin B3 (niacin)
    • RDA for females 19+ is 14 mg and 18 mg during pregnancy.
  • Vitamin B5 (panthothenic acid)
    • RDA for females 19+ is 5 mg and 6 mg during pregnancy.
  • Vitamin B6 (pyridoxine)
    • RDA for females 19+ is 1.3 mg and 1.9 mg during pregnancy.
  • Vitamin B7 (biotin)
    • AI (adequate intake) for females 19+ is 30 mcg (no change for pregnancy).
  • Vitamin B9 (folate)
    • RDA for females 19+ is 400 mcg and 600 mcg during pregnancy.
  • Vitamin B12 (cobalamin)
    • RDA is 2.4 mcg for 14+ and 2.6 mcg during pregnancy.

Which B vitamins are important during pregnancy?

All eight of the B vitamins are recommended for adults, including during pregnancy. The ones you may hear about the most often include:

Folate

Folate plays a critical role in the prevention of neural tube defects (NTDs) in a developing baby. NTDs are deformities of the neural tube, which is the embryonic precursor to the brain and spine. During a healthy pregnancy, the tube will seal itself off between three and four weeks of fetal development. In the case of an NTD, the tube doesn’t fully close, leading to devastating and life-threatening conditions like spina bifida. 

Research has shown that folate supplementation reduces the incidence of NTDs significantly. The results of these studies prompted the United States government to institute a folic acid food fortification program in 1998 so that all women of childbearing age would consume extra folate through their diet. Since the implementation of food fortification, NTDs have decreased in the US by 35%. We don’t yet fully understand how folate supplementation lowers NTD risk, but we know that it involves decreasing levels of homocysteine, an amino acid which is also tied to a higher risk of heart disease and stroke.

✨ Shop Folate⟶

 Besides helping to prevent NTDs, folate is also essential for creating new DNA, proteins, and red blood cells, the cells that transport oxygen throughout the body. 

Folate is naturally present in a wide variety of foods, including vegetables (especially dark green leafy vegetables), fruits, fruit juices, nuts, beans, peas, seafood, eggs, dairy products, meat, poultry, and grains. Spinach, liver, asparagus, and brussels sprouts are among the foods with the highest folate levels.

B6

According to the World Health Organization, vitamin B6 is important for several metabolic processes, as well as development and functioning of the nervous system, primarily through the biosynthesis of neurotransmitters. It has been previously suggested that vitamin B6 might play a role in the prevention of pre-eclampsia and possibly preterm birth. However, current literature reviews indicate that there is insufficient evidence on the benefits and harms of routine vitamin B6 (pyridoxine) supplementation during pregnancy, though it may provide some relief from pregnancy-related nausea.

Vitamin B6 is found in a wide variety of foods including fish, beef liver, other organ meats, potatoes, other starchy vegetables, and fruit (other than citrus). 

B12

Vitamin B12 is important for maintaining the health of your nervous system and the brain development and growth of a fetus. It’s believed that when taken with folate during pregnancy, B12 supplements can help prevent spina bifida and other spinal and central nervous system birth defects. Studies show that vitamin B12 deficiency is associated with adverse maternal and neonatal outcomes, including developmental anomalies, miscarriage, preeclampsia, and low birth weight.

Vitamin B12 is naturally found in animal products, including fish, meat, poultry, eggs, milk, and milk products. The Academy of Nutrition and Dietetics recommends supplemental vitamin B12 for vegans and lacto-ovo vegetarians during both pregnancy and lactation to ensure that enough vitamin B12 is transferred to the fetus and infant.

Is there such a thing as too much vitamin B complex when pregnant?

Any supplement routine, especially while pregnant, should be reviewed with your doctor. If you take a prenatal gummy and an additional supplement, you may be getting too much of one nutrient.

Some vitamins have Tolerable Upper Intake Levels (ULs), which is the maximum amount of a vitamin you can take on a daily basis without increasing your risk for negative health effects. ULs have been established for Vitamins B3, B6, and B9. However, the rest are not determined because there is not sufficient scientific evidence from which to set these levels, or there’s a low potential for toxicity. 

Tolerable upper intake levels (ULs) for B vitamins during pregnancy set by the Institute of Medicine for the United States and Canada include:

  • B1 (thiamin): not determined
  • B2 (riboflavin): not determined
  • B3 (niacin): 35 mg/day
  • B5 (pantothenic aAcid): not determined
  • B6 (pyridoxine): 100 mg/day
  • B7 (biotin): not determined
  • B9 (folate): 1000 ug/day
  • B12 (cobalamin): not determined

Should I take Vitamin B complex when trying to conceive (TTC)?

Yes, B vitamins should be in your prenatal, which should be taken while you are trying to conceive. Make sure your prenatal contains at least 600 mcg of folate (not folic acid), and the recommended intake levels described in the above section.

Take-aways

  • There are eight B vitamins that are referred to as “vitamin B complex.”

  • B vitamins are water-soluble, meaning they are readily absorbed into your body for immediate use and need to be replenished regularly via diet and supplements.

  • B vitamins are especially important while trying to conceive and pregnant.

  • Make sure your prenatal vitamin contains the recommended amount of B vitamins, especially folate, B6, and B12.

Featured Image by Sunsetoned

Shop Products From This Article
Subscribe & Save $2.00
MTHF Folate

MTHF Folate

Bioavailable folate supplement

$25 $23

Subscribe & Save $5.00 sticker bestseller
Prenatal Daily Packets

Prenatal Daily Packets

Vegan prenatal daily packets

$60 $55

Shop Products

sticker new
healthcare provider on virtual consult

Ovulation Support Care Plan

Ovulation support program with a licensed healthcare provider

$249

Subscribe & Save $5.00 sticker bestseller
Prenatal Daily Packets

Prenatal Daily Packets

Vegan prenatal daily packets

$60 $55

Subscribe & Save $3.00 sticker bestseller
Magnesium Plus

Magnesium Plus

Pregnancy-safe drink mix to support relaxation‡

$35 $32

Subscribe & Save $2.00 sticker bestseller
Prenatal gummy vitamins

Prenatal Gummies

Doctor-formulated & delicious prenatal gummies

$35 $33

Subscribe & Save $5.00 sticker bestseller
Prenatal Daily Packets

Prenatal Daily Packets

Vegan prenatal daily packets

$60 $55

Subscribe & Save $3.00 sticker bestseller
Magnesium Plus

Magnesium Plus

Pregnancy-safe drink mix to support relaxation‡

$35 $32

Subscribe & Save $2.00 sticker bestseller
Prenatal gummy vitamins

Prenatal Gummies

Doctor-formulated & delicious prenatal gummies

$35 $33

Subscribe & Save $3.00 sticker bestseller
CoQ10 Liquid Capsules

CoQ10 Liquid Capsules

Antioxidant fertility supplement

$35 $32

sticker bestseller
Pregnancy Tests

Pregnancy Tests

As low as $3.20 per test

$16

sticker favorite
Pregnancy Tests (2-Count)

Pregnancy Tests (2-Count)

Easy to read pregnancy tests

$9

sticker bestseller
Ovulation Tests

Ovulation Tests

As low as $1.67 per test

$30

sticker save
mid stream ovulation and pregnancy test bundle

The Test Pack

Pregnancy & ovulation tests

$46 $40

Reach Out, We're Here

Have questions about your order or products? For the speediest answer, check out our FAQ section. Need something else? Come find us below.

Customer Support
support@natalist.com

Press Inquiries
media@everlyhealth.com

Business & Partnerships
team@natalist.com

Affiliates + Influencers
team@natalist.com

Job Openings
Careers Page