So far, there is no evidence that natural breast enhancement supplements are truly effective. While breast enlargement can be a side effect of certain medications, such as estrogen, birth control pills, and antidepressants, there are no published studies supporting the same effect for natural breast enhancement supplements.
Additionally, some natural breast enhancement supplements on the market may contain phytoestrogens, which can increase the risk of certain types of breast cancer. They may also interact seriously with other medications, especially anticoagulants like warfarin.