b12 im injection dose Cyanocobalamin USP 1000 mcg/mL B12 Injection Dosage and Frequency:

If you experience significant energy decreases that do not improve, consider whether other factors might be involved

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So, we recommend using SL vitamin B12 rather than oral and IM, especially in patients who do not tolerate IM injection and patients who need prolonged vitamin B12 supplementation, such as patients with long-term metformin use and patients with pernicious anemia or with gastro-duodenal resection [51,52,53,54]

A robust immune system supports your overall health and helps you stay well

(20) Intestinal problems: Because B12 is absorbed in the intestines, any disease that impairs intestinal function can interfere with B12 absorption