sandoz b12 injection monograph vitamin 10 000mcg/10ml Sandoz presents an effective solution for iron deficiency anemia with Ferumoxytol B-12 Compliance Injection: Package Insert
Description
Coadministration of warfarin should be monitored carefully

Thin skin with minimal subcutaneous fat provides less cushioning for blood vessels, increasing the chance of capillary damage during needle insertion

New York, NY: McGraw-Hill Medical Publications
There is no risk involved with treatment with any amount of B12 with any frequency