Expert Answered Primo and Test E

[Rock089]

Hello,
I’m 33 years old, 180 cm tall, currently weighing around 89 kg with approximately 16-17% body fat.
I’ve been training for many years and have experience with testosterone, but I’ve never used Primobolan before.
I’m currently taking 250 mg of Testosterone Enanthate per week since 18.07.2026
My coach has recommended adding 100 mg of Primobolan per week.
My main goals are to build more lean muscle mass, improve overall symmetry and muscle definition, and eventually achieve a stage-ready physique with very low body fat.
Before introducing Primobolan, I’d appreciate a second opinion.
Would adding 100 mg of Primobolan per week offer meaningful benefits alongside my current testosterone use 125mg x2 weekly ? What are the potential risks, and what health markers should I monitor?
I currently feel healthy and have no known health issues.
Thank you for your advice!

 

[Sam Bjorn]

Hi and welcome to the community.

Speaking in terms of general recommendations, Primo is one of the most popular compounds. It potentially comes with fewer side effects and is often used with testosterone to build lean muscle mass. As for the test-to-Primo ratio, 250 and 100 are quite commonly used dosages.

I like that your coach initially chose a minimalist approach — it’s better to build muscle with minimal dosages and increase them gradually if necessary. Of course, competitive athletes don’t step on stage with such a minimalist approach, but it definitely makes sense to start low.

One thing that’s especially important when using Primo is that it lowers estradiol. This is good because you may not need to use aromatase inhibitors, but to make sure your estradiol doesn’t get too low, you’ll eventually need to find the right Primo-to-test ratio to keep estradiol at optimal levels for you. This is determined through blood tests. In any case, 250 and 100 is a good starting point. After 2 weeks, it makes sense to test your estradiol and check it. If you already have estradiol bloodwork from when you were on 250 mg of test, you can send it here and then we can compare the difference.

Besides that, I always recommend checking other blood markers as well to monitor them and make adjustments if necessary. I can send you a list.

Blood pressure is also extremely important. Do you measure it?

 

[Sam Bjorn]

attached a picture of my current progress actually 89kg i lost 40 kg since 12/2025 with Reta.

40 kg is awesome, bro, you’ve done a lot of work on yourself

 

[Rock089]

Hi and Thank you for the informations and quick response.
i had bloodwork done before starting with Test and next week Monday im doing it again so i will be able to send it to you next Wednesday.
and after starting with primo i will also do it after 2 weeks of using as you recommend, but i will wait your reply regarding my bloodwork next week before starting with primo.

thank you for your time this really means a lot

kind regards

 

[Sam Bjorn]

You’re welcome, bro! Send your bloodwork here when you get the results, and we’ll definitely go through it.

 

[Rock089]

Dear Sam,
Attached are my latest blood test results. The blood was drawn on Monday morning, right before my 125 mg Testosterone Enanthate injection. My next 125 mg dose is scheduled for tomorrow, Wednesday. For the past two weeks, I was injecting a bit extra—125 mg on Monday, 125 mg on Wednesday, plus an extra 50 mg on Friday or Saturday. However, I am now back to my standard protocol of 250 mg per week, split into two 125 mg doses on Mondays and Wednesdays.
I am incredibly grateful for all your help and advice regarding Primobolan and keeping my estradiol levels under control if needed (though right now, I don't have any side effects or issues). I am also considering adding HCG to wake things up, since I’ve been running this cycle since July 18th of this year and am thinking about extending it.

thank you​