Progesterone is made in the testes, as these are not removed in a vasectomy, you should have no worries. But a vasectomy is the equivalent to tying the tubes in a woman. Both prevent the sperm or an egg travelling to where they should. For more info on vasectomy please see here. And here. Please consider your partner having a copper T IUD instead, but not one of the IUD's which have a progestin impregnated in them. As this leaks into the body, not a good thing. A new paper has just been published on male contraception. Interestingly testosterone suppresses spermatogenesis and has been tried in male contraceptives, please see here. Update on Male Hormonal Contraception: Is the Vasectomy in Jeopardy? Take care, Wray
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Although this web site is not intended to be prescriptive, it is intended, and hoped, that it will induce in you a sufficient level of scepticism about some health care practices to impel you to seek out medical advice that is not captive to purely commercial interests, or blinded by academic and institutional hubris. You are encouraged to refer any health problem to a health care practitioner and, in reference to any information contained in this web site, preferably one with specific knowledge of progesterone therapy.