Yes, you may use more than one of these energy products at a time. They all work effectively with our line of Harmonizers, so feel free to use them in conjunction with one another any time you feel like it. As for combining story collections with each other, it’s best if you combine only three products together at first, to give your body time to adjust and acclimate to the energy levels in that particular combination of products. But, if you are feeling good and your physical and mental state remain positive, you may add one more product to the combination for a total of four at most. Remember, all of these products should be helping to stimulate your personal energy in a positive and uplifting way.