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Supplements and injections should be used as part of a broader weight management strategy that includes a balanced diet and regular exercise
For example, a gastrectomy (a surgical procedure where part of your stomach is removed) increases your risk of developing a vitamin B12 deficiency
How well the body absorbs B12 depends on age, gut health, and medical conditions
Though the link isnt well understood, scientists have linked the vitamin to serotonin and depression in people with a deficiency
Half-life (t) is the time for plasma concentration to fall by half
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