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Hypervitaminosis is possible with prolonged uncontrolled intake
There are side effects from taking Vitamin B12 supplements, like any supplement or tablet
Experimental doses in humans have ranged from 2-5mg administered twice weekly subcutaneously
Importantly, treatment did not negatively impact markers such as bone mineral density (BMD) or body weight in a manner inconsistent with healthy controls (Fawcett 2010)
Optimal B12 absorption depends on selecting the right injection site
Some people get a weekly shot during periods of high stress or fatigue, while others schedule monthly maintenance injections
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