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For intramuscular injections , which are common for administering Vitamin B12, needle lengths usually range from 5/8 inch to 1.5 inches

The results showed that while both methods are effective, sublingual vitamin B12 is actually more efficient in raising b12 levels than injections , especially in patients with very low levels

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Many physicians choose to treat B12 deficiency with B12 shots because injections avoid the gastrointestinal tract entirely

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