can vitamin b12 injections cause side effects and Folate Side Effects of Vitamin B12

Quality and regulation : Most oral B12 supplements are regulated as food supplements under food law, while injectable B12 and some oral preparations are licensed medicines regulated by the MHRA

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No human trial has characterized the side-effect profile of the blend specifically

(25) Interestingly, the bioavailability of vitamin B12 in dietary supplements has been found to be around 50% higher than from food sources