B Vitamins During Pregnancy: B Complex, Foods & Supplements
- B vitamins are a family of water-soluble vitamins including thiamin, riboflavin, niacin, pantothenic acid, vitamin B6, biotin, folate and vitamin B12. They contribute to normal processes including energy metabolism, nervous system function and red blood cell formation.
- Vitamin B complex usually refers to a supplement containing several B vitamins in one product. Many prenatal vitamins already include B vitamins, so a separate B-complex product may overlap.
- B vitamins are found across many foods, including wholegrain breads, fortified cereals, nuts, peas, meat, fish, eggs, dairy foods and leafy vegetables.
- This guide is general information only.
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Different B vitamins contribute to normal processes including energy metabolism, nervous system function and red blood cell formation. Their individual roles and food sources vary.
B vitamins can come from food, prenatal vitamins and other supplements. Before considering an additional B-complex supplement during pregnancy, check your existing products and discuss the proposed supplement and dose with a health professional.
This article is general information only.
What are B vitamins during pregnancy?
B vitamins are a family of water-soluble vitamins. They include thiamin, riboflavin, niacin, pantothenic acid, vitamin B6, biotin, folate and vitamin B12.
During pregnancy, B vitamins should be understood as part of a broader nutrient pattern. They are involved in normal body processes.
Food sources, prenatal vitamins and separate B-complex supplements can all contribute to B-vitamin intake. The key is understanding what you already get and whether an extra supplement is suitable.
Vitamin B complex during pregnancy
Vitamin B complex is not one single nutrient. It usually refers to a supplement containing several B vitamins in one product.
A B-complex supplement may include B1, B2, B3, B5, B6, B7, B9 and B12. Some products include all of these, while others focus on selected B vitamins or use different forms and doses.
This matters during pregnancy because many prenatal vitamins already include B vitamins. A separate B-complex product may overlap with your prenatal vitamin, especially if it contains folate, B6 or B12.
Most nutrients should come from food, while supplements are formulated to provide nutrients that may be missing from the diet.
Are B vitamins suitable during pregnancy?
B vitamins from food are different from taking a separate B-complex supplement. B-vitamin foods are part of normal pregnancy nutrition, while supplements add measured doses on top of your diet and prenatal vitamin.
The suitability question becomes more important when you are considering a separate B-complex product or multiple supplements at the same time.
Key B vitamins during pregnancy
B vitamins work as a group, but each vitamin has its own role. This table is an overview only.
| B vitamin | Common name | Pregnancy note |
|---|---|---|
| B1 | Thiamine | Involved in energy metabolism |
| B2 | Riboflavin | Supports normal energy-related processes |
| B3 | Niacin | Involved in normal body function |
| B5 | Pantothenic acid | Supports energy-related metabolism |
| B6 | Pyridoxine | See upper level guidance below |
| B7 | Biotin | General nutrient support |
| B9 | Folate | Important enough to have its own dedicated page |
| B12 | Cobalamin | Contributes to red blood cell formation and nervous system function |
Vitamin B12 during pregnancy
Vitamin B12 contributes to red blood cell formation, nervous system function and DNA synthesis. NIH ODS explains that vitamin B12 is naturally found in animal-origin foods and is also added to some fortified foods and supplements.
Pregnancy Birth and Baby lists B12 as one nutrient to consider if you follow a vegan diet during pregnancy.
People following vegan, vegetarian or other restricted diets may need their vitamin B12 intake reviewed by a health professional. If you are concerned about B12 intake or levels, speak with your health professional.
Folate, folic acid and B vitamins during pregnancy
Folate is vitamin B9 and is subject to specific Australian pregnancy recommendations.
Some supplements contain different forms of folate. Their suitability should be assessed using the product label and health professional advice. For detailed information, see Folate During Pregnancy.
B vitamin foods during pregnancy
B vitamins are found across many foods. A varied pregnancy diet can include whole grains, meat, poultry, pregnancy-suitable fish, eggs, dairy, legumes, leafy greens, nuts, seeds and fortified cereals.
Different foods provide different B vitamins, which is why variety matters.
| Food group | B vitamin relevance |
|---|---|
| Whole grains | Often provide several B vitamins |
| Meat and poultry | Sources of B vitamins including B12 |
| Eggs and dairy | Useful sources for some B vitamins |
| Legumes | Provide folate and other nutrients |
| Leafy greens | Folate-containing foods |
| Fortified cereals | May contain added B vitamins |
NHS lists B-vitamin food sources across the B vitamin family, including wholegrain breads, fortified breakfast cereals, nuts, peas, meat, fish, eggs, dairy foods and leafy vegetables depending on the specific B vitamin.
B vitamin supplements during pregnancy
B vitamin supplements during pregnancy should be considered in the context of your full routine. That includes diet, prenatal vitamins, separate B-complex products and any other supplements.
A separate B-complex supplement should be compared with your prenatal vitamin before use. Check whether your prenatal already includes B6, B12, folate or other B vitamins.
Also check which B vitamins are included, the amount per serve, whether folate or folic acid is included, pregnancy suitability, label directions and health professional advice.
Questions about B-vitamin intake during pregnancy
Low intake, restricted diets, vegan or vegetarian diets can all affect nutrient status. People following vegan, vegetarian or other restricted diets may need their vitamin B12 intake reviewed by a health professional.
If you are concerned about low vitamin B levels during pregnancy, speak with your health professional.
Can you take too much vitamin B during pregnancy?
Some B vitamins have published tolerable upper intake levels (ULs). A UL is the highest daily intake considered unlikely to cause harm: it is not a recommended dose. For example, Eat for Health lists a UL for vitamin B6 during pregnancy as 40 mg/day for age 18 and 50 mg/day for ages 19 to 50. These figures may be subject to update as the NHMRC is reviewing the Australian and New Zealand vitamin B6 Upper Level. Your actual intake needs during pregnancy should be discussed with your health professional, not self-selected based on upper intake levels.
The TGA has announced a rescheduling decision for oral vitamin B6 products. This decision was made because of suitability concerns.
Under the rescheduling decision, from 1 June 2027:
- oral preparations containing 50 mg or less per recommended daily dose will continue to be available for general retail sale.
- oral preparations containing more than 50 mg but not more than 200 mg per recommended daily dose will be available over the counter with the advice of a pharmacist.
- oral preparations containing more than 200 mg per recommended daily dose will continue to require a prescription.
These are regulatory scheduling categories, not dose recommendations. The appropriate dose for any individual, including during pregnancy, depends on personal circumstances and should be discussed with your health professional.
Frequently asked questions
Are B vitamins suitable during pregnancy?+
B vitamins from food are part of normal pregnancy nutrition. Separate B-complex supplements should be assessed based on dose, product label, current prenatal vitamin, supplement overlap and health professional advice.
Can you take vitamin B complex while pregnant?+
Do not add a separate B-complex supplement during pregnancy without first checking your existing products and obtaining appropriate health-professional advice. Many prenatal vitamins already contain B vitamins, so compare labels before using a separate B-complex supplement.
What is vitamin B complex?+
Vitamin B complex usually means a supplement containing several B vitamins in one product. It may include B1, B2, B3, B5, B6, B7, B9 and B12, depending on the formula.
Which B vitamins are important during pregnancy?+
Several B vitamins support normal body functions during pregnancy. Folate, or B9, has specific pregnancy guidance, and B12 contributes to red blood cell formation and nervous system function.
Why is vitamin B12 important during pregnancy?+
Vitamin B12 contributes to red blood cell formation, nervous system function and DNA synthesis. People following vegan, vegetarian or other restricted diets may need their vitamin B12 intake reviewed by a health professional.
Is folate a B vitamin?+
Yes. Folate is vitamin B9. Because folate has specific pregnancy guidance, detailed information belongs on the dedicated Folate During Pregnancy page.
References and official guidance
This guide was prepared with reference to Australian pregnancy supplement guidance, B-vitamin food information, vitamin B6 nutrient reference values and vitamin B12 information.
- Pregnancy Birth and Baby: Vitamins and supplements during pregnancy
- NHS: B vitamins and folic acid
- Eat for Health: Vitamin B6 Nutrient Reference Values
- NIH Office of Dietary Supplements: Vitamin B12 Fact Sheet for Health Professionals
This article provides general information and does not recommend a particular product or treatment. It does not replace personalised advice from a health professional. Supplements should not replace a balanced diet.
