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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
Office of Dietary Supplements - Vitamin B12. Nih.gov, 27 Feb
Common side effects include injection site reactions, gastrointestinal disturbances, headache, and chromaturia
Chronic conditions may warrant 6 to 8 week cycles with 4 to 8 week breaks between
Extended intervals are the weakest layer
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