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However, if youre already getting enough of the vitamin from your diet, its unlikely that youll notice any changes to your energy levels by taking a vitamin B12 supplement
Low B12 causes fatigue, so correcting it gives deficient people more energy to stay active
Where to Inject B12 First, decide whether youll inject subcutaneously or intramuscularly
A single B12 shot continues to deliver benefits for roughly two to four weeks, with peak effects in the first week and a gradual taper after
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