A vitamin B12 deficiency can lead to symptoms including fatigue, weakness, depression and a swollen tongue or bleeding gums
However, if your B12 levels are already healthy, an injection is unlikely to provide a significant energy boost or promote weight loss
Selected Research References Gwyer D, Wragg NM, Wilson SL
Pull the plunger back to the 2mL mark, filling the syringe with air
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While some effects are noticeable immediately, others provide long-term benefits over weeks or months