You are under no obligation to purchase nutritional supplements using the third-party links in this site. As a service to you, Dr. Janine only used reputable manufacturers who have gained her confidence through considerable research and experience. Quality by considering: (1) the quality of science behind the product; (2) the quality of the ingredients themselves; (3) the quality of the manufacturing process; and (4) the synergism among product components. The brands of supplements that are linked to this site are those that meet the above high standards and tend to produce predictable results. Keep in mind that these supplements are not recommendations that are not based on your individual situation.