Cause of B12 deficiency

B12 deficiency isn't exciting - and there's no money attached.  B12 can't be patented, it has been around for decades and it is cheap to manufacture (90% of the world's manufactured B12 is injected into farm animals).

Hundreds of thousands of people suffer from B12 deficiency in England alone, so it is a serious problem, but with no new research, medical students don't get trained to look for nutritional deficiencies, and doctors don't get it as part of their updates.

Vitamin B₁₂ is essential, but you need to get it from your food "diet", as animals can't make it but get it from bacteria [1] (see “where does B₁₂  come from?”)

  It is the largest food molecule that we absorb, and has amine rings with a cobalt atom in the middle (molecular weight 1355.5).  It's used for many things, and as the molecule is so big, problems can occur getting it in your diet, digesting it, transporting it inside the body, and using it in the right place.  It is completely safe so you can take B12 supplements though we find that many people need injections.