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A vitamin B12 deficiency affects energy levels and immune health and may cause neurological problems like numbness and tingling in your hands and feet

Supplementation may help improve mood and reduce symptoms of depression, particularly in those with B12 deficiency

In one study, people with obesity who received vitamin D supplements in addition to following a weight loss diet plan lost more weight and fat mass than the members of the placebo group, who only followed the diet plan

The guides below explain the benefits of B12 injections, common signs of deficiency, and what to expect when receiving a vitamin B12 injection at a pharmacy clinic

No claims are made regarding therapeutic, diagnostic, or biological suitability beyond research use

But there are times when you might want to consider poking yourself with a needle