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A healthcare professional uses a thin needle to deliver the concentrated B12 solution directly into the muscle tissue, usually in the upper arm or thigh

Researchers can experiment to find what works best for their situation

Given that absorption through the gastrointestinal tract can be impaired in some individuals, injections provide a reliable alternative to oral supplements

Compared to GLP-1 agonists GLP-1 receptor agonists like semaglutide and tirzepatide have become extremely popular for weight loss

Some researchers do adjust doses based on body composition, using higher doses for subjects with greater fat mass

And if you're allergic to cobalt, B12 injections aren't for you