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does b12 injection cause chills Do Injections Help with Fatigue and Low Energy? Vitamin B12 Injections Side Effects
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and Tyler et al

The contraindications are due to health concerns

In fact, several scientific studies have noted a link between low vitamin B12 levels and obesity, metabolic disorders, and insulin resistance

It's particularly important for those suffering from B12 deficiency, where regular dietary intake or oral supplementation might not suffice
