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For these individuals, vitamin B12 injections are often the most effective way to restore healthy B12 levels because they bypass the digestive system entirely, delivering the vitamin directly into the bloodstream for maximum absorption (around 95% compared to 25-50% for oral supplements)
A deficiency in B12 can lead to a significant decrease in energy and exercise tolerance, along with fatigue
By assisting in metabolizing fats, carbs and proteins, your metabolism speeds up and allows you to burn calories and lose weight quicker
Interestingly, while you absorb 40 to 50 per cent of vitamin B12 from foods, including fortified foods, the absorption from supplements depends on the dose (EFSA, 2015
Reusing them increases the risk of infection and contamination
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