Very interested in these discussion

I have a decent amount of experience at this point with both and can say that I fiind them to be completely different compounds. Primo is a slow (I call it boring jokingly, but it is) compound that really allows me to use more test than I could tolerate on its own. It lowers SHBG, leaves my cholesterol unchanged, controls my estrogen well around 2:1, doesn't spike my blood pressure, and it builds muscle on me steadily and predictably. I notice virtually no change in my drive or personality. It may just slightly push me towards being slightly edgy, but I have a generally stressful life haha, so it's hard to say if that's really contributing. For reference, my current cycle is 840 test, 400 primo, 350 npp, and I'm on the last 10 weeks of a long 24 week bulk. Every blood marker is absolutely perfect currently, and I pulled bloods at the start of September.

My masteron experience (always used enanthate, btw, never tried prop) has always been very positive. My girlfriend loves when I'm on masteron because I have a spike in libido that's very noticeable. It has a lot more "drive" for me, and gives me that "I'm the boss, get out of my way" attitude, but it's not ragey or asshole, it's just confidence. Love that shit. I use it when I'm cutting for that drive, and it dries me right the hell out so my water weight is minimal when I get down around 10% bodyfat or lower. The problem with masteron for me is that if i overdo it, it gives me low estrogen sides that really fucking take a toll on my joints. Not fun, but it's easy to avoid. Just start at like 3:1 ratio with your test and push up from there. My favorite cutting cycle (and many people would agree) is test, mast, and tren. It puts the look on that we all strive for. Dense, grainy, vascular, ripped.

There ya go. Good luck.

They go hand and hand for me test mast primo is my go to all year long. Primo keeps my e2 perfect at 2:1 ratio and the mast dries me out a little more and the libido/well-being increase is beautiful

Primo all the way for myself. Lowers the e2 considerably and leaves my skin feeling tighter and younger almost :p(minus follicleitis)

Mast leaves me shedding in week 3 obviously that’s person specific but I did notice a drop in libido as well for both.

I tend to operate better at higher estrogen and since stopping the primo my folliculitis on my chest has improved drastically.

Higher amounts of gear ain’t for me either my first and probably last blast left me pretty much fucked after dropping back down to trt.

I’m thinking health conscious side of things now like yourself. With the addition of wee doses here and there of compounds.

Most likely the drop in libido is the e2, 24 is pretty low. I'm also thinking since you mentioned Reta, it obviously means you are cutting right now. When you diet for long enough or when energy expenditure gets to high with low energy intake your body starts to shift what it deems as a necessary use of energy exertion. Pretty much your body is saying, "hey I need the energy we would like to give to you for fucking, but we need your sexy time energy to be used to going out and bagging us some Elk so we can fucking eat".

Primo if im cutting or not hitting my diet goals. If i know its gonna be hard to hit my calories/protein, ill use 300mg and thats enough to retain all my muscle in a caloric defecit. Ive never seen mast work as well in that way.
I usually run mast if im running higher testosterone doses. I think it pairs well with mast for bulking.
Primo didnt impress me as a bulking agent at all. It was actually dissapointing. Although, ive never gotten past week 9, running 8/900ish mg a week.
I just think for the cost, its a real dissapointment. If you can afford it... I mean... whats your health worth to you. If I could afford id, id run primo hands downs over everything besides test. Its just not realistic for me financially. Ive gotta be conservative with it so I use it when I can.

I would like to see how Mast works after cutting with Primo. I think thatll be my next experiement.

Primo is gonna effect you bw less than mast.

If youre only talking about adding in 100mg or so of mast a week... I dont think you have to worry much about your blood work. Mast will probably improve your libido more than Primo.

I ran primo at the start of my cut and it worked great for lowering e2. However, I transitioned to EQ and much prefer it over primo. The appetite boost from EQ helps me hit my macros with ease whereas before I struggled due to reta.

Now that I am much leaner and my cut is over in ~6 weeks I decided to add mast prop. I am loving it. It feels really good mentally and the aesthetic effects are great. I am gonna run Masten during my growth phase too.

I can't speak to the aesthetic effects of primo because I was tubby when I was on it... but I'm sure had I been as lean as I am now I would be impressed.

One is expensive ASF and the other is really really expensive ASF.

Masteron works better for me because I’m sensitive to the E2 lowering effects of primo.