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This article explains the benefits of vitamin B12 and how to reach your daily needs

A three way crossover study in 25 fasting healthy subjects was conducted to compare the bioavailability of the B12 nasal spray to the B12 nasal gel and to evaluate the relative bioavailability of the nasal formulations as compared to the intramuscular injection

You probably don't need to take a B12 supplement or get a B12 injection if you eat foods with the vitamin

While facilities making compounded medications are strictly regulated for certain quality practices, the compounded medications themselves are not approved or evaluated by the FDA for safety, effectiveness, or quality

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