b12 injections and proteinuria is high levels of protein in your urine. Causes may include relatively harmless conditions, including dehydration or intense exercise, or more serious, including kidney disease or immune disorders. Testing can confirm B12 Shots: Benefits, Uses, Safety,
Description
Diuretics : May deplete potassium, magnesium, and zinc

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Usually, vitamin B12 shots are only available by prescription and are administered monthly, unless otherwise recommended by the doctor

Unfortunately, the staff spoke zero English & I dont speak French, so it was a bit of a struggle

Elevated serum B12 levels may indicate underlying conditions such as liver disease, kidney dysfunction, or myeloproliferative disorders requiring medical evaluation

It is also from a company I trust
