reviews b12 lipotropic injections Vitamin Injection How Long to See Results
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That said, if you do get side effects, they can influence when you inject your dose

2010 Sep;95(9):4291-304

Rai et al

Vitamin B12 deficiency can occur for a range of reasons, including reduced dietary intake, impaired absorption, gastrointestinal conditions, and autoimmune causes

When your B12 is low, you may crave red meat, eggs, dairy products, and other animal-based foods because these are the richest dietary sources of vitamin B12