merck b12 injection Vitamin B-12 5000 mcg Sterile Solution Injection, 100mL This injectable formulation helps restore normal vitamin B Sandoz Vitamin B12 Injectable Solution

If it was anything other than sterile saline, it may have been a preservative that you reacted to, such as benzyl alcohol

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Adult Dosing Dosage may vary based on different medical indications: For the initial treatment of vitamin B12 deficiency, the usual dose is 1000mcg SC/IM, given once a day for 1 week, followed by 1 dose a week for 1 month

If you're taking metformin for diabetes, you're actually at higher risk for B12 deficiency, making supplementation even more important