posted Sun, 05/24/2026 - 10:50
642
+ 2 Question About Primo
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I’m getting ready to run a Test/Primo cycle and wanted some advice on ratio’s that worked best for experienced Primo users.
My previous bulk cycle largely consisted of Test/EQ and I ran EQ at 60% of my Test dose. I tolerate EQ pretty well and it never crashed my E2. I prob could’ve raised it even further.
I’ll probably start out at about 300 test to wet my beak and titrate up over the weeks.
Thanks for the help.
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For me 1:1 ratio tanked my e2 which sucked ass.
I’m a high e2 converter - but I liked it at about 80% of my test . 750test 600 primo was gold for me . So like 1.25:1 , I can do 1.3:1 as well . Favorite secondary compound of mine by far .
I ran eq similar ratios and I was converting too much e2 unless I ran eq high along with high test .
Low test low eq my e2 starts to rise .
Wouldnt say im an experience primo user but ive run 10-15 vials of it or so. Ive yet to complete a full primo bulking cycle. I got to week 9 or so and didnt notice much at 700ish mg a week. I bet if I ran it longer id notice results. I probably stopped right as it started kicking in. Life got in the way. Haven't had the funds to give it another go yet.
I dont wanna half ass it again.
I ran my test at 500mg a week. I felt really good the whole way through. Next time Ill probably try to run it at 1000mg a week and the test at 750mg.
People arent exaggerating at how mild/slow it is. I found that out. I did notice how well it works for cutting and mainting muscle in a caloric deficit. Nothing works better imho.
Oh wow. Yeah I’m using it for a cut. The EQ worked great for the bulk. I decided to start 1:1 test to primo and see from there. After I get bloodwork done I’ll move stuff around. Thanks for the reply man
Its amazing for cutting. There were a couple weeks during my half ass attempt at bulking where I barely at any food. I got addicted to stimulants for a week, its dont think I had more than a small meal every day. Missed the gym the whole time. I never saw ANY loss in muscle tissue. Very little loss in strength, if any.
I kept taking my doses of primo but I completely neglected my diet/training for a week, maybe a couple days more.
I ran a smaller dose another time (350mg a week) to see how little id need to maintain muscle in a caloric deficit and that dose seemed as effective to me.
Ive been stocking up on some for the summer. Im gonna run 350mg all summer. Im sure there will be a couple days/weekends im slacking off. Its incredible how well it works. I have a fast metabolism. I lose mass quick if Im not constantly eating/training. Its like a "muscle preservative"
I’m a high test > e2 converter. I started at 1.5/1 Test/Primo ratio to test how my body reacted. Ended up at 1.25/1 ratio and that had my e2 in the 50s where I like it.
Ok, I appreciate the feedback. Good getting others experience.
I would replicate your EQ ratio then make adjustments from there.
This makes a lot of sense and still keeps me under 1:1. Good idea
Exactly ^
Gainz411It’s really not black and white because everyone aromatizes estrogen differently. Some guys run Primo 1:1 with test and feel great, while others need Primo closer to 50% of their test dose or they start feeling low E2 sides.
A lot of it comes down to how you personally respond, your body fat %, total androgen load, and bloodwork.
Also, there’s a professional bodybuilder named Paul Barnett that sells a cycle design cheat sheet for like 30 bucks. Might honestly be worth grabbing if you want a better understanding of ratios, compounds, and how different people structure cycles.
Thank you, yes I have the cheat sheet. Really trying to get a rough estimation of others ratio’s. Experiment then get bloods done.
Primo needs to be ran pretty high. While everyone is different and you need to figure out what works for you I would suggest test at 500 mg/ week and primo at 500 to 600 per week. I would not suggest starting low and working your way up. Primo needs to be ran for at least 16 weeks for it to really shine and it takes longer to see the results, starting low first will only prolong the results you seek
Yeah I’m leaning this the is ratio. Thanks man.
I’d do 2:1 Test to Primo.
I agree with this. I would start the cycle with the doses you would like to use, also. I am on my second primo cycle, so I cannot say I have a lot of experience. My first time using it, I went 1:1 with 700 test and 700 primo, and I was around 12% body fat at that time, and I found out the hard way that 1:1 would crash my e2 down to 12 with an ultrasensitive e2 test. SO, I went to 2:1 and that did the job just fine, but how much muscle that put on me, it's hard to say, really. My newest cycle, I went with 850 test and 280 primo with 450 Deca. I'm only on week three of that setup, but I can tell that everything is setting in nicely at this point. I plan on running this for as long as possible, with 24 weeks being the goal. Unless I want to run my test at a really high amount, primo is always just kind of a safer choice for an AI for me, and it adds a little bit of anabolism into my stack.