I know this isn't totally the original point of this topic. But, I wanted to give a little feedback on SARMS. There have been studies done, clinical trials etc. Old folks, who didn't train were given 3 mg per day of s4 for 6 months (or was it 3?) and gained around 3-5 lbs of lean muscle mass. If it affects prostate, hairline, estrogen levels etc. it is a minute amount.
I am not an experienced or committed enough competitor to stay on all the time. But, I am about 40-50 lbs over my natural muscular weight. I have found out the hard way that I cannot continue to progress to any great degree past this size point without changing something in the way of drugs. I'm not giving up, I'm just acknowledging that I've been diligent and this is where I'm at.
To make regular size gains without getting fat I need some kind of solution such as Wulfgar outlined. My solution for us "intermediate" guys (those at the point of genetic limit but not big competitors yet) is to cycle for 8 weeks aas, pct including products such as Nelson's AND Sarm s4 extended past the regular pct period (several weeks past)to nearly the next cycle or straight into the next aas cycle if needed.
I'm on sarm s4 right now and I am getting some encouraging results. I did 5 weeks of a keto diet without it and am now on week 3 with it. Fat burning has increased- unlike normal at this point in my diet where it would be slowing down. In fact it had all but halted before I went on s4. I have gained and maintained more muscle fullness- which is hard to do when on very little carbs, working a job (or two) and training. No bloat, no testicle shrinkage (I wouldn't have any 3 weeks in anyhow), no noticeable sides (my dose is 75 mg daily, so the eyesight issues have not shown up). I'm up 2 lean lbs by my estimation, and down a half inch on my waist (aprox 2.5 lbs- a good fat loss for me!-even over 3 weeks). Some say s4 makes you crave protein, I'd agree as I am taking in plenty without even thinking about it, around 350-400g per day.
Obviously I can't speak for anyone else and I am not being rigorously scientific, nor can I know the full end results at this point. But, from the research, input from others and my small experience I think we may be looking for that elusive "bridge" drug. Or, at least a base from which to work off of.