When Estradiol Gets Banned
While it is easy to block testosterone - just remove or damage testicles, boosting estrogens is harder
Bisphenol-A (BPA), a widely used chemical in the production of polycarbonate plastics and epoxy resins, can be estrogenic.
when the animals' diet was exclusively comprised of a mixture of BPA, peanut butter, and powdered chow during days 1-4, an average daily intake of 68.84 mg BPA terminated all pregnancies.
https://pubmed.ncbi.nlm.nih.gov/17070006/
The main difficulty is extracting it from plastic in a pure injectable form.
Hopefully, distillation column and home made centrifuge could help filtering out heavier particles that can clog veins.