A long-acting, nonhormonal contraceptive for men, with thousands of men on the waitlist.

Dogs & Cats

Calcium chloride (“Calchlorin”), a low-cost, nonsurgical neuter shot available to vets now.

Breast Cancer

What if hormones aren't fuel for the fire after all? Surprising results point to benefits of hormones.


Veterinarians open to offering ovary-sparing spay, vasectomy and other alternatives to traditional spay/neuter

iStock_4516712_MegaPhone_BlueOur Mission

Parsemus Foundation works to create meaningful improvements in human and animal health and welfare by advancing innovative and neglected medical research. The foundation’s focus is on supporting small proof-of-concept studies and then pursuing press coverage of the results, so that the advances change treatment practice rather than disappearing into the scientific literature. Many of the studies we support involve low-cost approaches that are not under patent. When supporting development of technologies under patent, Parsemus Foundation coordinates with larger funders to make sure support is contingent upon strong public-sector pricing agreements.

Current areas of focus are contraceptive development (particularly long-acting nonhormonal male methods); nonhormonal, nonsurgical sterilization for animals; and noninvasive treatment for benign prostatic hyperplasia. And that’s not all — additional projects are listed in the page links above. Applications for support are by invitation only except where specifically noted. Please see Our History page for selected highlights and milestones.

Recent News

Featured Studies

Success! Publication of Vasalgel reversal study

Successful reversal of Vasalgel male contraceptive in rabbits For immediate release: Vasalgel’s prevention of sperm transport in the vas deferens for 14 months was reversed through an injection of sodium bicarbonate. Sperm concentration and motility returned to baseline. Results of a study of a promising new male contraceptive called VasalgelTM were published today in Basic… Read more

Successful application of Vasalgel™ male contraceptive in monkeys

Press Release Monday, Feb. 6, 2017 20:00 EST New contraceptive Vasalgel provides effective birth control in rhesus monkey groups for more than one year: report from California National Primate Research Center Results of a study of Vasalgel in rhesus macaques were published today in Basic and Clinical Andrology. Vasalgel is being developed by a social… Read more