I've got some info i'll post on it. but off the top of my head, what is known is that all 4 sarms so far that are in full swing are suppressive to some degree.
But I havn't seen any human studies done to know what that degree is, or whether it's enough to matter.
taken from "the anabolics book" ch. 20 "s.a.r.m.s"
"We will have a closer look to the SARM's that nowadays are under clinical trial.
Some members of the group of aryl propionamides are already on the market as anti-androgens. Based on their structures, the SARM's S1, S4, C6 and later S22 are developed.
They show good anabolic activity and have only a partly androgenic effect on the prostate. They do suppress the secretion of LH and FSH. Especially C6. shows this effect, and pharmacists consider application of this compound in male contraception."
"It will not necessarily lead to problems when the body’s own production of testosterone will be down to a low level due to the application of a SARM. The SARM itself will take over the anabolic function of testosterone. When there is very little testosterone also the production of dihydrotestosterone will be low. That is an advantage because then also the androgenic effects of dihydrotestosterone will be prevented. The body does need the small quantity of estradiol, but in most cases there will be enough testosterone produced, to take care of that. "
"The perfect SARM has to fulfill all these conditions. But just as with anabolic steroids, one SARM does this in a better and different way then the other. Untill now four groups of SARM's with promising properties have been published. These four groups are mentioned in Tabel 1. All these SARM's are androgen receptor agonists with good bonding to the receptor. The SARM-androgen receptor complexes show good anabolic activities in animal tests"
S1, S4, C6 and BMS 564929 are presently under clinical trial.
Some members of the group of aryl propionamides are already on the market as anti-androgens. Based on their structures, the SARM's S1, S4, C6 and later S22 are developed. They show good anabolic activity and have only a partly androgenic effect on the prostate.
They do suppress the secretion of LH and FSH. Especially C6. shows this effect, and pharmacists consider application of this compound in male contraception.
A SARM with high anabolic activity that is attractive for sportsmen and bodybuilders, still has to be found. When this will happen, the makers of designer SARM's and illegal supplements have a problem.
It is not that easy to change the structure of a SARM a bit, to enhance its anabolic activity or to circumvent patents. Any minor change in its chemical structure may change an agonist into an antagonist. This last remark should be a warning for chemical sportsmen that are offered designer SARM's. They just as well may have an opposite effect.
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to read the write up in full, click on the link below. but be warned, it's a lot of info.........................
20. Selective Androgen Receptor Modulators (SARM's)