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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
Neurochemical Research 36 (6): 10121016
How Long Does It Take Vitamin B12 Injections to Work
Intramuscular Vitamin B12 Injections Wash your hands with soap
No, taking vitamin B12 does not directly lead to weight gain
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