after taking b12 injection urine color This is what happens when Vitamin itamin Recate with Water : r/Science_India Hydration Status | 360 Bariatrics:

Are there specific dosing requirements for patients with certain medical conditions

Sub q should in theory give close to 100% bioavailability, but we really dont know the one PK study never tested it, so theres no measured number and no dosing conversion behind it

To give a subcutaneous injection : Pinch the skin to make a fold

The article is consulted with Master, Doctor Nguyen Thi Ngoc - General Internist - Endocrinologist - Department of Outpatient and Internal Medicine - Vinmec Times City International Hospital

These ranges come from allometric scaling of the animal work plus anecdotal reporting not human trials so anchor your expectations to that