This is a clear indication of contamination or a compounding error
While we usually think about low B12 causing anemia, a few case reports describe new or worsened polycythemia - an elevated red cell mass - after B12 administration
In cases of unexplained macrocytic anemia associated with high homocysteine levels and normal B 12 testing results, folate testing may be arranged if supported by laboratory specialist consultation
The right next step depends on the reader's evidence, safety, cost, access, and provider-review needs
Who Shouldnt Take Vitamin B12 Shots If you have certain medical conditions, supplementing with vitamin B12 injections could be dangerous (4)
Visualization of lipid directed dynamics of perilipin 1 in human primary adipocytes