The packaging OptiMSM Plankton consists of 240 capsules of each 550 mg. Each capsule contains 300 mg OptiMSM and 250 mg Marine Phytoplankton powder. The OptiMSM is of a Flake quality. These crystals are coarser than powder and do not stick together. However, because of the crystals, dissolving takes longer if you take the content of the capsule, for example, to dissolve it in water or fruit juice. This MSM quality is 100% pure.