Cycle Advice: First time adding Primo to Test E (Ratio & Timing questions)

Back Cycle Advice: First time adding Primo to Test E (Ratio & Timing questions)

Krokei

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Hey everyone,

I’m planning my next cycle and could use some advice and experiences regarding a Test E and Primobolan stack.

My Background:

I previously ran a solo Test E cycle for about a year. After that, I took a full year completely off. Now, I’m planning to go back on Test E for a longer period (around a year), but this time I want to add Primo into the mix for the first time.

I have two main questions regarding the dosage ratio and the timing:
1. Dosage & Ratio:

If I run Test E at 300mg/week, would 500mg/week of Primo be a good baseline? Is that too high, too low, or a solid ratio to start with? I’m aware that Primo can act as a mild aromatase inhibitor (AI) for some people, so I want to avoid crashing my E2 (estrogen) levels.
2. Timing & Duration:

Since the Test E cycle will last about a year, what is the best way to deploy the Primo? Should I run it continuously for a certain number of weeks, or does it make sense to split it into two separate blocks (e.g., 6–8 weeks at the start and another block later in the middle of the cycle)? Given that Primobolan is a long ester, what is the optimal length to actually get the most out of it?

Would love to hear from anyone who has run this exact combo before. Any tips, personal experiences, or adjustments to the ratios/timing would be greatly appreciated!

Thanks in advance!
 
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