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Rare systemic effects (hypokalemia, gout exacerbation, or allergic reaction to cobalt) occur in specific populations and require immediate medical attention
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PMCID: PMC11053547
Here's what you need to know: How they work : Injected into muscle (usually shoulder or glutes) for 100% absorption Common types : B12, B-Complex, and Vitamin D3 are most popular Key benefit : Skip digestive issues that can block nutrient absorption Best for : People with diagnosed deficiencies or absorption problems Not for : Weight loss or energy boosts in healthy people Research shows that up to 88% of people following vegetarian or vegan diets have B12 deficiency
