In a conversation on Triggernometry, Dr. Rhonda Patrick identified personal hygiene products used daily by millions of men as major sources of hormone-disrupting chemicals that contribute to declining testosterone levels and reduced fertility.
While much attention focuses on plastics in water bottles and food packaging, Patrick emphasized that shaving cream, lotion, shampoo, and other grooming products contain phthalates, chemicals deliberately added to extend the shelf life of fragrances.
These compounds appear on ingredient labels under the vague terms “perfume” or “fragrance,” masking their presence in proprietary blends.
“Phthalates are in shampoos, shaving cream, lotion, makeup, hair products,” Patrick explained. “Women are definitely consuming a lot of these through their hygiene products, but men as well.”
The evidence connecting these chemicals to hormonal disruption operates on multiple levels. Phthalates directly interfere with testosterone production in the testes and affect the hypothalamic-pituitary-gonadal axis, the regulatory system controlling hormone production throughout the body.
Research consistently shows associations between higher phthalate levels and lower testosterone at every life stage.
Patrick explained: “Men with higher levels of phalates have much lower levels of testosterone. So again, we’re seeing this trend of these chemicals that are put into plastic. They’re put into our personal hygiene products, and they’re affecting hormone levels. And so I think that’s just a recurring trend.”
The consequences extend beyond individual health. Pregnant women with elevated phthalate levels face dramatically increased risks of their sons developing serious reproductive abnormalities, including undescended testicles, the primary risk factor for testicular cancer in young men.
These developmental disruptions also affect fertility and hormone production throughout life.
Patrick noted that phthalates represent just one category in a broader chemical assault on male hormones. Bisphenol A (BPA) and its cousin BPS, found throughout plastic products and even thermal paper receipts, bind to both estrogen and androgen receptors, confusing the body’s hormonal signaling. Studies of adolescent males show that for every logarithmic increase in BPA levels, testosterone drops by nearly 50 percent.
Global sperm production has declined by 50 percent over recent decades, while testosterone levels continue falling with each generation.
Patrick pointed to large-scale nutritional surveys involving hundreds of thousands of participants that consistently find men with higher phthalate levels have significantly lower testosterone.
Unlike the brief presence of BPA, which exits the body within hours, some chemicals persist far longer. Forever chemicals known as PFAS, found in water-resistant and stain-resistant products including nonstick cookware, remain in human bodies for four to five years.
Patrick described the contamination as pervasive, with even organic dairy products showing elevated levels because cows excrete these chemicals through their milk.
The researcher outlined practical steps for reducing exposure. Installing reverse osmosis water filters removes 99 percent of microplastics and associated chemicals.
Avoiding heated plastics, particularly to-go coffee cups lined with BPA-containing plastic, prevents the 55-fold increase in chemical leaching that occurs with hot liquids. Reading ingredient labels on personal care products to avoid items listing “fragrance” or “perfume” eliminates a major source of phthalate exposure.
“It’s totally a public health crisis,” Patrick stated. “These chemicals are everywhere. They’re in our water. They’re in our food. They’re in our personal hygiene products. We need to be talking about this.”
