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If you feel drained no matter how much you sleep, and losing weight is harder than it should be, low vitamin B12 could be playing a role
There are several factors that are taken into consideration, such as your age, your activity level, your body-fat ratio, your weight loss goals, your metabolic rate, and your overall energy levels
This is the most common route for B12 in a clinic, usually into the deltoid muscle of the upper arm
As with any supplement or medication, individual responses vary
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