Originally Posted by Pikey

Depends on the Lab and product some test mixes are 400mg per ml, I know of one which is 500mg or at least it claims to be, all depends on the solvent – the heavier dosage densities do tend to be more painful. So there’s no direct answer to how many ml you need for a given dosage, it depends on the strength of the suspension.
The dosage density per ml differs hugely with differing products