what does the b12 injection help with Vitamin Injections | Energy Boost Vitamin B12 Supplements and Injections
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Itching or rash

doi: 10.1016/0092-8674(94)90006-x

Stronger Immune System: B12 plays a role in the production of white blood cells
Some people also find that pressing firmly near (but not at) the injection site with a finger for a few seconds before inserting the needle provides competing sensory input that reduces pain perception

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Avoid combining with other stimulants during the initial adaptation period
