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Intramuscular (IM) vitamin injections bypass the gastrointestinal system entirely, achieving 70 to 80% greater bioavailability than oral supplementation
These may include excessive thirst, skin conditions, blurry vision, abdominal cramps, nausea, vomiting, and increased risk of severe side effects for individuals with existing health conditions
Immune system disorders, such as Graves' disease or lupus, are also linked to vitamin B12 deficiency
Both share similar research applications
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