Are my numbers right

[enean1]

Is 50 units the equivalent to 1/2 cc

[Bonaparte]

As far as the tick marks on an insulin syringe: yes.
Other than that: no. This is because the IU is not a measure of volume, but of biological effect and will vary in mass from one compound to the next.

[enean1]

so will a insulin syringe be ok to use for decatest 500?

[Bonaparte]

Probably not. Most oils are too thick to flow through a slin pin (unless you have all day).