B12 Deficiency in Pregnancy

Katt Farrow • December 17, 2020

What is Vitamin B12 and where does it come from?

Vitamin B12 is an essential nutrient in humans, is made by bacteria, and is responsible for a myriad of functions within the body. It plays a role in the metabolism of many foods and helps ensure the health of red blood cells and the nervous system.


The bacteria which produce Vitamin B12 can be found in a range of soils, and is produced in the gut of ruminant animals. As these animals produce their own B12 from bacteria inside their gut, B12 is able to accumulate and is, therefore, found primarily in dietary animal products. As a result of current hygiene and sanitisation processes Vitamin B12 is found in inadequate quantities in plant products. 


The body stores B12 in great quantities, mostly in the liver. Despite being stored in high quantities, the kidneys excrete small amounts of the vitamin daily and thus adequate dietary intake is important.


Growlife Medical are experienced in treating B12 Deficiency in pregnancy. Please contact us today for advice.

Who is at risk of becoming B12 deficient?

  • Those following a vegetarian or vegan diet
  • Pregnant or breastfeeding women
  • Acquired malabsorption of B12
  • Individuals with Coeliac or Irritable Bowel Disease
  • Chronic use of metformin
  • Bowel or stomach surgery (gastrectomy or ileal resection)
  • History of autoimmune disease or pernicious anaemia
  • Age related malabsorption
  • Individuals with inherited disorders of B12 absorption

What the symptoms of B12 Deficiency in Pregnancy?

It is quite common to have no symptoms, even if you are B12 deficiency. We tend to recommend checking your B12 if you are in any of the risk categories above. However, if your B12 deficiency is severe, you could experience:


  • Anaemia (Anaemia is much more commonly due to Iron Deficiency in Pregnancy)
  • Swollen, Sore or Inflamed Tongue
  • Fatigue
  • Memory Problems
  • Numbness or Tingling in the Hands or Feet
  • Other unusual neurological symptoms

What are some sources of B12? 

  • Nutritional Yeast
  • Fortified animal product alternatives (e.g. soy milk)
  • Animal products (e.g. beef, eggs, milk)
  • Oral or injected supplementation


If you are concerned that you may be deficient in Vitamin B12 or for more information please consult your doctor to work out the next best steps.

Is Vitamin B12 important in pregnancy?

Due to increased metabolic demands during pregnancy it is easier to become deficient in B12 and this should be monitored throughout pregnancy if you are at risk of B12 deficiency. Deficiencies in B12 during pregnancy can lead to neural tube and brain defects, and supplementation can help prevent spina bifida and nervous system abnormalities. Additionally, B12 can improve energy, mood, and stress levels throughout pregnancy.

Growlife Medical Are Pregnancy Experts

We provide expert community care of pregnancy, with doctors, midwives and dieticians ready to help you through your pregnancy. Please chat to us at Growlife Medical.


We are also Brisbane's leader in Telehealth Consults, Growlife Medical now provides easy and secure Telehealth Consults with your doctor. You can easily book online or over the phone, for a video or phone consult with your GP. All Growlife Medical Doctors in all or our general practice locations are available for Telehealth consults.

Other Articles On Pregnancy

Pregnancy Nutrition and Exercise | Growlife Medical
October 13, 2022
Growlife Medical explores recommendations around exercise and nutrition during pregnancy, Avoiding Food Contaminants and Gestational Diabetes.
LGBTGIA Lactation Induction
By Dr Sonja Morgan August 24, 2021
Lactation induction is encouraging one's body to produce milk without carrying a pregnancy, and is becoming more common in surrogacy or adoption situations.
Hand Therapist Brisbane | Growlife Medical
By Sauhin Ng June 16, 2021
Our hands connect us with the world; we use them to work, communicate and to care for not only ourselves, but others. With the welcoming of baby
Motherhood Reimagined | LGBTIQ+ Author - Educator - Advocate | RJ Miles | Growlife Medical
By RJ Miles October 23, 2020
The birth of my son split me in two. It happened gradually, then suddenly. As far as children go, he was dearly wanted and now that he is here, he is dearly loved.
Low Iron in Pregnancy | Growlife Medical
September 25, 2020
What is Anaemia in Pregnancy? This article explores low iron in pregnancy including symptoms, causes & treatments Growlife Medical Anaemia experts can provide.
Your Guide to Contraception | Growlife Medical
By Annabel Chau September 1, 2020
Thinking about contraception but not sure where to start? Sick of taking a pill every day and want to know what else is out there? This article is your guide
Guide to Gestational Diabetes | Growlife Medical
By Dr Aaron Chambers May 24, 2020
Growlife Medical's guide to gestational diabetes explores high blood sugar when pregnant, gestational Diabetes risk factors, symptoms, treatments and more
Guide to Coronavirus and Pregnancy | Growlife Medical
April 1, 2020
Our guide to Coronavirus and pregnancy explores pregnancy risks associated to the Coronavirus. Dr Aaron Chambers details how to reduce risks for unborn babies.
By Katie Barry December 6, 2019
It’s a common misconception that reaching the 6 week milestone means that one should be back to their pre-pregnancy clothes, running, attending exercises
Show More

Share this article