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Its cryptic retraction notice states: Due to the lack of agreement on affiliation format between authors and the owner of the journal, this article has been retracted at the request of all authors, the Editors-in-Chief and the owner of the journal

Given the range of independent labs involved, the former is more likely

Serum and liver vitamin B12 concentrations were found to be significantly elevated for 24 days in lambs treated with a single 2 mg subcutaneous vitamin B12 injection, compared to untreated controls ( There have also been a few case series published reporting the general efficacy of the subcutaneous route at normalising plasma B12 levels

A., Willhoite, A

It is typically reconstituted with 1ml of water for a 5mg/ml solution