What a fantastic thread. Great info here. Let me add my experience as well.
I took 15mg of Osta for 3 months. Made super awesome gains and fell in love with the product. Infact, put on 20kg's, although this was post surgery and I think a lot of this weight was my body coming back to normal.
Stopped seeing gains a little after 2 months, and stopped the Osta in my 3rd month. After about 2 weeks of no osta, I started to feel depressed, and suspected my test levels were low.
Got my bloods done and sure enough they were down to about 50% of normal. Don't know the actual numbers, this is what the doc told me.
Went back on the osta to stop feeling depressed. This worked, felt fantastic, but still not making any gains, even though training and diet were good.
Now I ordered some S-4 thinking I could stop the osta, and use the s4 instead to let my boys come back. So I have been taking s4 @50mg/day for 5 days now. Stopped the osta 5 days ago when I started the s4. I also bought a natty test booster (bulbine) and have been on that for 5 days as well. Today (fifth day off osta) was the first day I felt crappy again, had a bit of a cry over some not so bad news, but haven't lost any weight or strength.
Infact, I think these may have gone up. My boys actually feel smaller, and my next blood level isn't until April. Interestingly enough though, the shitty depression I get from being suppressed goes away when I take Craze. Craze makes me feel normal and not all shitty and sad and emotional.
So my question to you boys out there, should I stop the S4 and start some pct, or just keep doing what I'm doing and continue the s4 and bulbine? (IronMag Labs - Ultra Male RX) I really want to stay on the S4 to see if my levels come up whilst taking it. If my test levels come back to normal, my plan is to cycle osta and S4 alternating them in 1 month intervals. If my levels do NOT come back up, then I will just do osta 1 month on, 1 month off @15mg/day as everything was normal for the first couple of months on the osta.