B12: What Is It & Do We Need to Supplement?

After ‘Where do you get your protein/calcium/iron from?’ most vegans will sooner or later have to face the B12 question.

It is an important topic, but not just for vegans: B12 deficiency can occur in meat-eaters (farm animals are often deficient and require supplementation),  as well as pregnant women and breast-fed infants whose mothers are vegan, whilst the over-50’s can be deficient due to poorer absorption.

So what is B12, why do we need it, where do we find it, how much do we need and in what form?

B12 is a water-soluble vitamin that is one of the compounds required by the body to convert food into energy. It is required for a healthy nervous system, good bone health and in the development and protection of nerve cells and red blood cells.

B12 deficiency can have severe effects on adults, babies and children, long-term vegans, raw food and macrobiotic vegans, the breast-fed infants of vegan mothers and can lead to serious complications in pregnancy such as pre-eclampsia and neural tube defects.

Symptoms of deficiency can be fatigue, anaemia, poor concentration, gastrointestinal disorders, tingling in hands and feet, and irritability. Severe deficiency can lead to nerve damage, Alzheimer’s disease, pernicious anaemia, spinal cord degeneration and heart disease. There is a also a higher risk of bone fractures.

B12 is produced by micro-organisms and is present in the soil in which we grow our food – or at least, it used to be. A combination of demineralisation through modern farming methods and our concerns about hygiene and bacteria – resulting in the cleansing of soil from vegetables – means we can’t just rely on normal food sources: we are advised to include fortified foods or take supplements.  Well, some experts do and some aren’t too sure! More on this later.

Non-vegans routinely obtain B12 from animal sources: cooked liver, fish/seafood, poultry, eggs, milk amd cheese. However, as I said earlier, these sources are becoming less reliable and older people whether omnivores or vegans are less able to absorb the amounts necessary for healthy bodily functions.

Recommended daily amounts tend to vary from country to country, so you may need to do a little research to find out if you are getting enough.

The Vegan Society in the UK recommends eating fortified foods such as breakfast cereals, plant milks, yeast extract or nutritional yeast with every meal to obtain 3 mcg (micrograms) per day OR a daily supplement of at least 10 mcg OR a weekly supplement of at least 2000 mcg. Good quality organic Aloe Vera juice is also a good source of B12.

It is best to take little and often but the less often you have it the more your body needs, so a higher dose weekly supplement should also provide enough protection.

Traditionally, vegans have relied on sea vegetables and algae such as spirulina, nori and so on, as well as barleygrass, but there is now some doubt as to their efficacy:  recent studies have concluded that these sources are unreliable and possibly dangerous due to contamination. They are believed to contain B12 analogues which can interfere with B12 absorption and metabolism.

Most experts seem to advise supplementation.

But even this is not without controversy! Here comes the science bit: Many supplements are in synthetic form which is not as bioavailable and the general consensus seems to be that Methylcobalamin is the most bioavailable source and ideally a supplement should be a combination of Methylcobalamin and Adenosylcobalamin.

imageSublingual sprays are often preferred to tablets. Global Health Centre recommends VeganSafe B12.

I found it very hard to find an organic B12 supplement and they are very expensive. However, they do last a long time. I had to buy mine from Mykind Organics in the US. I have been taking a weekly spray of 5000 mcg for about 6 months now and my B12 levels are fine. It is raspberry flavoured and very easy to use.

I hope this has helped clarify this issue, it is difficult to be sure of getting the right information when even those trained in this area aren’t even in full agreement!  Watch the short video of a debate on the subject by a panel of experts in nutrition at the end of this article.

Sources: The Vegan Society

Forks Over Knives

Global Healing Centre

Dr Steven Lin

Copyright: Chris McGowan

7 thoughts on “B12: What Is It & Do We Need to Supplement?

  1. Totally agree. I take B12 supplements (well a multivitamin and occasional spray of B12) and give them to my older child. My younger child is just under a year and is breastfed, so he is probably fine for now.
    Better to be safe. 🙂

    Liked by 1 person

  2. Reblogged this on The Richness of a Simple Life and commented:
    Spreading the blog love on this beautiful Good Friday. A great post explaining what vitamin B12 is and why we need it. This blogger participated in my original meet and greet and I’m glad because I love all of the information available. Check out the original post and be sure to share your love over there! Happy Friday! I’m off for a family adventure so I’ll see you Saturday!

    Liked by 1 person

      1. You bet! You have so much great stuff going on on your blog I didn’t know which to pick. I think a lot is covered by fitness and health and I thought it would bff interesting to highlight something other than exercise or food for a change. Glad I found this 🙂


  3. I had no idea that B12 was so difficult for vegans to obtain. As a non-vegan….I think (hope) my diet is pretty well rounded. Can vegans eat that brown stuff in a jar….whatsit called…*googles* marmite? ( I was going to say Bisto for a second, ha!)


    1. Yes, yeast extract is rich in B vitamins, but B12 is added to Marmite and some experts and others don’t like the high salt content or other additives. The Danish government banned it.


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