A slow metabolism can be a huge roadblock on your weight loss journey, as reduced metabolism keeps your body in fat-storing mode instead of fat-burning load
B12 / B Complex injections can be especially beneficial for vegans, vegetarians, older adults, busy professionals, athletes, and anyone with increased nutrient demands or symptoms of deficiency
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"If you just go person to person, depending on which coupon of the day they have, you may not get the benefit of their prior experience in treating you," Dix said
How long you feel the effects can depend on your starting levels, which is why people with a larger deficiency sometimes notice the benefits over a longer stretch