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Vitamin K is a cofactor for carboxylation reactions that add a CO2 to the amino acid, glutamic acid (glutamate), in certain proteins
Vitamin B12 deficiency means your body is not getting enough to stay healthy, and as a result you can experience symptoms such as tiredness, headaches, shortness of breath and heart palpitations
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In fact, its thought that up to 88% of people following these diets have a deficiency ( This is because B12 is only found naturally in animal foods
Acta Physiol (Oxf) 219:382408
, 25 , 4787-4792, doi: Han, C., Liu, Y., Dai, R., Ismail, N., Su, W., and Li, B
