Deep breathing is a good way to increase oxygen and so is physical activity. Many like food grade H2O2, but I personally prefer a product called OxyGen when it comes to using supplements for increased oxygen. It comes in both liquid and capsule form. In capsule form, each capsule contains oxygen and the equivalent of 12 drops of 35% food grade hydrogen peroxide derived from a combination of magnesium peroxide and pure anaerocidal oxygen.