FDA does not review compounded medications for safety, effectiveness, or quality before they are marketed
Another possibility is that obesity could lower serum vitamin B12 levels through decreased dietary intake or absorption, increased catabolism, and sequestration in adipose tissue, or changes in the gut microbiota profiles which could affect the metabolism of vitamin B12
Biweekly B12 shots are often given to athletes or individuals with high-stress lifestyles who burn through nutrients more quickly
The choice depends on the patients specific needs and the doctors evaluation
If you have a significant deficiency, you might start to notice an improvement in your energy and mental clarity within the first few days or after a couple of injections
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