The CEDR Report

The CEDR Report - Issue #9
The CEDR Report - Issue #9
Spermatogenesis requires the scrotum to run 2 to 4°C cooler than core body temperature. Synthetic fabric closes that gap. Three decades of peer-reviewed studies measure exactly what it costs -... Read more...
The CEDR Report - Issue #8
The CEDR Report - Issue #8
A 2017 IUCN report identified the largest source of primary microplastics in the world's oceans - and it is not tire dust, not industrial pellets, not paint. It is synthetic... Read more...
The CEDR Report - Issue #7
The CEDR Report - Issue #7
In 2013, the C8 Science Panel concluded that perfluorooctanoic acid had a probable link to testicular cancer. In 2019, a study of 212 young men identified the mechanism - these... Read more...
The CEDR Report - Issue #6
The CEDR Report - Issue #6
A study in Environmental Science & Technology found that wearing polyester releases 900 million microfibers per year - three times more than washing. A 2024 Lancet-published study on 113 men... Read more...
The CEDR Report - Issue #5
The CEDR Report - Issue #5
Deep inside the male reproductive system sits one of the tightest biological barriers in the human body. The blood-testis barrier separates the bloodstream from developing sperm cells. A 2025 study... Read more...
The CEDR Report - Issue #4
The CEDR Report - Issue #4
A 2024 study published in Environment International provided the first experimental evidence that chemicals from synthetic microplastics leach into human sweat and absorb through the skin. A second study found... Read more...
The CEDR Report - Issue #3
The CEDR Report - Issue #3
A 2023 meta-analysis of 53,000 men across 53 countries found sperm counts have dropped 51.6% since 1973 - and the rate of decline doubled after 2000. A landmark Harvard study... Read more...
The CEDR Report - Issue #2
The CEDR Report - Issue #2
In 1992, Egyptian surgeon Ahmed Shafik fitted 14 healthy men with a polyester scrotal sling and monitored their sperm for 12 months. Within an average of 140 days, every single... Read more...
The CEDR Report - Issue #1
The CEDR Report - Issue #1
A July 2025 study found that polystyrene microplastics - the same type shed by synthetic clothing - caused significant sperm DNA fragmentation within 30 to 90 minutes of exposure. Combined... Read more...