Biphenyl/Diphenyl Preservatives

Polychlorinated biphenyls (PCBs) were banned in the ’70s for causing severe thyroid damage, but they’re still active in our environment. Today, biphenyls and diphenyls are found in cosmetic moisturizers absorbed through the skin and also in farmed fish. There are multiple points of exposure to this harmful product, so keep your eyes peeled in even uncommon products like hand cream.

Biphenyls are commonly used as a flame retardant, so even trace amounts can disrupt the endocrine system, throwing your hormones out of whack.