We sincerely hope you get the desired effects from the supplements you purchase. However no one can guarantee that this will happen. Each person is unique in their response. One person may notice great benefit from a supplement, while another may have a side effect or an allergy. Yes, natural herbs and supplements, just like medicines, can have side effects. Discuss with your health care provider if a particular supplement is appropriate for you before you purchase. Always start with a low dose, even if it means using a portion of a capsule or tablet. Combining certain supplements together or certain supplements and prescription medicines can sometimes lead to unexpected reactions. Do not purchase multiple bottles of a supplement if you are not sure whether it will work for you. We cannot guarantee a supplement will help you; however, we do guarantee that the products we are offering are of the highest quality available.