What should I do if the injection site is red or sore
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One of the possible reasons that anaemia is much less prominent in B12 deficiency than lets say 30 years ago, is that many countries have started mandatory fortification of food with folate
Also, sadly enough, there also are many types of (chronic) diseases that require B12 injections, such as Pernicious Anemia, people with Crohns, celiac, and people with intestinal imbalances, such as intestinal tapeworms and excessive bacterial growth
Takeaways It can take years to see the effects of vitamin B12 deficiency anemia