The concentration for every compound is different. GW is 20mg per ml which is a full dropper, and S4 is 50mg per ml which is also a full dropper. The dropper is ml of liquid. You have to do the conversion with basic math to get your ml required for the,dose you wantWouldn't the gw be just under half being the dropper is based on 50? And Dylan's dosage rec says 20 all at once