Just Relaxin
I have been intrigued by Relaxin since I first read about it, and I had hoped that it could possibly become a viable PE supplement. This thread today has prodded me to do some research and I think I can safely conclude that Relaxin will not be the magic bullet for PE. Even if it were to work, I think there are some potential drawbacks:
Why it won't work
1) See the study here.
Two parts of the study speak to PE
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Furthermore, this study provides evidence that both the vagina and uterus contain specific and saturable relaxin-binding sites in epithelial cells, smooth muscle cells, and cells associated with blood vessels. We conclude that these cells probably initiate relaxin’s effects on the vagina and uterus of the pregnant pig.
Or in English, relaxin will only work on body parts that are designed to work with it.
The study also says:
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Relaxin is secreted, but has no verified effects in humans.
2) In addition, Relaxin might not work except in the presence of high levels of female hormones. See here for a pig study indicating that Relaxin by itself might not do the trick.
The study concludes in part:
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Relaxin alone had no effect on either uterine length or wet weight…. Combined treatment with progesterone, estrogen, and relaxin increased both uterine length and wet weight maximally.
3) Dosage. In the above study the gilts (female pigs) were given .5mg four times per day, for a total daily dosage of 2.0 mg. The study does not state it, but the average weight for a gilt is 250 pounds. The Vitalaxin pills are 20mcg each, so it would take 100 of the pills to equal the daily dosage given to the gilts. On a per pound of bodyweight basis it would take 80 tablets per day to give the equivalent dosage to a 200 pound human. In addition, the relaxin administered in the study was almost certainly injected. Since the relaxin pills must pass through the digestive tract, it is likely that a good bit of it or even all of it would be broken down in the stomach and not reach the bloodstream. This would increase the amount required to be taken by a factor of 2 to 10 times. Thus you would need somewhere between 160 and 800 pills per day (or possibly even more) to get to the dosage used in that study.
Drawbacks
1) Greatly increased risk of injury. For the sake of argument, suppose that relaxin would work in the body of a human male. Anything that relaxes your ligaments substantially could turn any physical activity into a hazardous endeavor. Think about how easy it would be to turn your ankle, dislocate your shoulder or knee, or cause some other havoc with many other body parts if your ligaments actually stretched too easily.
2) Since high levels of relaxin are not normal in a male’s body, then it’s a totally untested medical concept for a male. Probably no harm here, but it might be a very dangerous thing to try.
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On the other hand if someone gave me some of the pills, I’d probably try them, but just not expect anything.