That's an easy one to answer. Ostarine and S4 are research chemicals, not intended to be sold for human consumption. For that reason they must be manufactured and sold as such. The last time I checked rats didn't take capsules too well. I would question any companies selling Ostarine in capsule form, as they are seriously riding the legality line there. I would be willing to bet many are underdosed or don't have legitamite Ostarine in them at all.
That's why it is important to go with a trusted and reputable company like sarmssearch for your needs.