Bisphenol A (known as BPA) is an industrial chemical used to make plastics. It's often found in epoxy resins. BPA has been known to mimic Estrogen inside of humans. This can cause many adverse and damaging effects on us, even in the small doses leaked through plastic bottles into your water. ‍ While there are countless things linked to BPA, there are three that we find most pressing: heart problems, lower testosterone, and higher risk of cancer.