why do you take b12 injections Benefits of for Optimal Health The Truth About B12 Injections:

Medical Disorders People who have liver disorders often have difficulty storing vitamin B12, so it is quickly absorbed into the body rather than stored for later use

(March 2018)

There are also certain drugs and health conditions that can increase the likelihood of developing a B12 deficiency, such as: alcohol abuse, antacid use, smoking, celiac disease, other digestive concerns, pregnancy, a strict vegetarian or vegan diet, and even natural aging

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It also is not the case that every one with liver problems will have high B12 levels

Even if you eat a diet rich in animal protein, its still possible to be deficient in vitamin B12, which is where the shots come into play