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You can use the deltoid or gluteal muscles
Poor planning leads to inconsistent use
A 2021 systematic review of 16 randomized controlled trials and 6,276 participants (Markun and colleagues, Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue, Nutrients, 2021) found that B12 supplementation does not reliably reduce fatigue in people who are not deficient
However, sometimes you may experience diarrhoea, headache, nausea, and vomiting
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