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For more in depth information on potential side effects, read this article from WebMD

Try keeping track of exactly how much vitamin B12 you are consuming on a weekly basis and promptly consult your primary care physician if you start experiencing any adverse symptoms, like trouble sleeping at night or gastrointestinal discomfort you might want to lower your dosage if nothing else but your weekly vitamin B12 consumption has changed

If you're deficient in B12, injections can increase your energy and well-being (which may lead to weight loss)

This distinction allows researchers to explore upstream metabolic regulation and cellular signaling mechanisms through a different experimental approach