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Hold the skin taut to prepare the muscle for injection
Extended intervals are the weakest layer
Do not freeze reconstituted solution
Office of Dietary Supplements - Vitamin B12. Nih.gov, 27 Feb
At clinical doses under supervision, the most common side effects are mild nausea in the first week (typically resolves by day 7 to 10), injection site reactions (redness, minor swelling, localized soreness lasting 24 hours), and occasional transient fatigue or mild headache in the first few days
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