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An intramuscular injection (commonly 1,000 mcg , given in the upper arm, hip or thigh) sidesteps the gut entirely and delivers a near-complete dose into circulation within minutes

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Weight-based dosing considerations Some protocols adjust dosing based on body weight

However, some potential side effects may include pain, redness, or swelling at the injection site, as well as allergic reactions in rare cases

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The frequency and dosage of these shots depend on your need and your reaction to these injections