I am on 120mgs and feel like a million bucks. Bloods are also perfect. Keeps my total test around 850-950. I am 37 and I do take 2 IU of hgh a day 3 days a week and mk677 2-3 days a week. Kind of a weird protocol but I'm happy with it. I feel amazing and maintain muscle just fine. Strength is a little lower but hell I'm 5'8" 225 pounds and only eating 2500 calories a day with 45 minutes of cardio and I'm happy how I'm holding muscle and losing fat. I'll probably stay at this dose forever with maybe a couple bumps to 300mgs or so for short periods of time during the year.
Edit: I am not gaining though...which is ok. I imagine at this dose I physically cannot and will not gain. I'm ok with that.
double edit: I do think I could gain if (like poster above) I increased calories. I walked around 240-260 for many years and I think I could put some back on with this low of a dose but I would absolutely gain more fat with that muscle, I'm sure.
that's a really good test level for 120mg a buddy of mine is on 75 mg a week and his total test is 1300 but free test is 25pcg/ml he showed me his blood work he said it should be around 30pcg for being 1300, I told him that since he eats keto SHBG is going to be higher so free test is going to be less