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(Study: Heffernan et al., 2001) Efficacy: Preliminary studies have shown promise, with some subjects experiencing significant weight loss

Still, side effects from B12 supplements are possible, especially at higher doses, and include: Headache Nausea Vomiting Fatigue Weakness Diarrhea Tingling in the hands and feet Nasal spray Vitamin B12 is also available in a nasal spray

If your levels were very low, the change can feel more obvious during those first couple of days

There is no recommended maximum

They support metabolism and energy, making lifestyle changes and weight loss programs more effective

[23] What signs suggest overdose