prescription for b12 injections where they are from How to Give a Injection: Step-By-Step Instructions π Vitamin B12 Injections β
Description
The formula to convert mcg to mL is: mL = mcg / concentration (mcg/mL)
If this is the real reason then why dont they prescribe pre-loaded syringes like they do when you have an operation

However, elite sports organizations that follow WADA guidelines may prohibit any substance that enhances NAD or mimics metabolic regulation

Sun et al., 2019)

doi: 10.1177/15648265080292S107
