Let X be a simply connected a(p)-space. The mod p cohomology rings of Omega X are studied. When these rings are finitely generated as algebras, Omega X has the mod p homotopy type of a generalized Eilenberg-MacLane space. If X is just an H-space with H*(Omega X; Z(p)) finitely generated as an algebra, H*(Omega X; Z(p)) is still primitively generated free commutative.