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You should get B12 shots weekly to monthly for maintenance and IV infusions monthly to quarterly for broader wellness support, though frequency depends on deficiency severity, health goals, and your providers recommendation

Medical consulting and lab testing are recommended before use to monitor hormones and fertility markers

Long-term metformin use clearly associates with increased b12 deficiency rates

How to Get Enough B12 Through Diet and Supplements Dietary sources of vitamin B12 are exclusively animal-based or fortified products

The 0.9% benzyl alcohol content serves a dual purpose: it prevents microbial proliferation and it extends the usable life of the vial after the first puncture