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The vitamin has gotten some buzz in the past decade or so after celebrities including Rita Ora, Justin Timberlake, and Madonna were reported to have tried injections to boost their B12 levels

You can expect an initial test about a week to ten days after you start your injections to see how your body is responding

Your bloodstream will rapidly absorb it, giving you a fast-acting boost of energy and cognitive function

The third on our 3 Different Types of B12 list is Hydroxycobalamin is another form of vitamin B12 that is used in injections to treat vitamin B12 deficiency

NNMT inhibition significantly increases energy expenditure, reduces body weight and white adipose mass, and improves insulin sensitivity

Methylcobalamin, on the other hand, is a naturally occurring form of B12