Test + Progestin as Male Birth Control?

It's commonly known that after being 'on' a moderate Test cycle for a while, you are much less likely to have a child. I have seen contraceptive effectiveness rates from 90% all the way up to 99.2% as in this clip from a google search :

"'A few years ago, the Lancet Medical Journal of England reported that they found testosterone (the proto-type anabolic steroid) to be a remarkably effective form of male birth control. Researchers conducted a 12 month study which included 270 men and determined that weekly injections of the hormone testosterone were 'safe, stable, and effective.' They dis-covered that weekly testosterone injections had a success rate of 99.2% as a birth control method. That makes it more effective than the birth control pill (97%) and much more effective than condoms (88%). The study also revealed that the effects of the contraceptive injections were entirely reversible upon discontinu-ing administration of the drug and that the testosterone injec-tions produced minimal side effects."

With the wide variation I've seen, as well as anecdotal reports of conception while 'on', I think it would be foolish to rely on test alone as a primary means of birth control. However, recently I have seen reports of studies that show that adding progestin to a testosterone program, increases the effectiveness of testosterone as a contraceptive agent to the point where it could be relied on as a primary means of birth control. If you google 'male birth control pill' you can see what I mean. Some of the studies talk about a pill that includes testosterone and progestin which may hit the market in a few years. One of the others described a weekly injection of 400 mg Test as well as a daily dose of progestin. I don't remember the dose of progestin, but it was in line with that found in a typical female birth control pill.

I would love to find a way to keep my wife off of the pill since I don't like what it does to her. I've also been seeing that many are starting to question the validity of cycling testosterone in favor of staying 'on' for longer periods of time. The logic goes like this :

Once your natural systems are shut down, as happens during a typical 10-12 week cycle, it doesn't make that much difference if they stay down for a longer period of time. You are going to need to kick your natural systems into gear and with proper PCT, this is not much harder if you have been on for much longer periods of time. In fact, the logic goes, it is harder on your body to turn your gonadal systems on and off repeatedly as happens when cycling.

I'm not currently wanting to have children, but I definitely want to keep that option open in the future. At the same time, I love just about everything about being 'on' a moderate dose of test, and if I could, in good conscience, stay on for longer than ten weeks at a time, I'd jump at the chance. Add to this the possibility of not needing to worry about birth control while 'on' and I am looking at a really appealing proposition. So, the questions I need to answer are :

1. How long can I be on a dose of 400 mg/ week of Test without endangering myself.

2. What kind of side effects would I see by adding a daily dose of progestin? I know progestin is a synthetic variant of progesterone and that progesterone is generally something to be avoided as a man. The studies out there on its use of a male birth control agent are reporting no signifiant side effects.
 
progestins increase prolactin which, when high enough, will make a man lactate.

400mg/week reduces your health.

The studies or whatever can say whatever they want but it happens all the time that men on hard cycles (which often include very high doses of testosterone and progestins) get women pregnant.

Maybe you wife should investigate a non-hormonal IUD.
 
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