is it in a vial or an amp......... if vial you will open amp of water and inject it into vial roll it around in your hand to mix and when ready to use, 100iu slin pin and every 10 iu's liquid is 500 ius hcg
You don't need to 'roll' it, it mixes instantly.

If you do store it in the fridge and use the single amps, use bacteriostatic water instead of the water that is included. It's good for 6 weeks in the fridge this way.