Estrogen is a hormone synthesized by the human body. So technically no, pea protein is not high in estrogen because it literally can not contain it. However, it is composed of nutrients called phytoestrogens. Phytoestrogens have been found to mimic the hormone estrogen in the human body. When compared to other dietary sources (like soy-based protein), pea protein contains a miniscule amount of phytoestrogen.