Switching from Test + Primo to Test only

[UtopiaSoon]

I’m currently running Test E 500 mg/week + Primobolan 400 mg/week, but I can’t get Primo anywhere at the moment.

I want to avoid Masteron because it gave me hair issues before. I’m also on finasteride 1 mg/day, so I’m trying to be careful with my hair.

I’m thinking about running Test E only until Primo is available again. If I drop the 400 mg/week Primo, how much would Test E usually need to be increased to get roughly a similar overall effect to Test E 500 mg/week + Primo 400 mg/week?

I know it’s not a perfect 1:1 conversion, but I’m looking for a practical approximate equivalent.

+ How would you manage estrogen in this case? I have Anastrozole 1 mg on hand, but I don’t want to take it blindly.

 

[Donvitosharkone]

I’m currently running Test E 500 mg/week + Primobolan 400 mg/week, but I can’t get Primo anywhere at the moment.

I want to avoid Masteron because it gave me hair issues before. I’m also on finasteride 1 mg/day, so I’m trying to be careful with my hair.

I’m thinking about running Test E only until Primo is available again. If I drop the 400 mg/week Primo, how much would Test E usually need to be increased to get roughly a similar overall effect to Test E 500 mg/week + Primo 400 mg/week?

I know it’s not a perfect 1:1 conversion, but I’m looking for a practical approximate equivalent.

+ How would you manage estrogen in this case? I have Anastrozole 1 mg on hand, but I don’t want to take it blindly.

Hi mate!

I wouldn’t try to “replace Primo with more Test”.

500 Test + 400 Primo is balanced because Primo improves the overall quality of the cycle: cleaner look, less water, easier estrogen management, more stable feel. If you remove it and suddenly push Test to 700–800, you’re not recreating the same cycle, you’re creating a much more estrogenic and harsher environment.

In your case, especially with hair sensitivity and already using finasteride, I’d simply keep Test around 400–500 max and run Test-only until Primo is available again.

Yes, progress may feel a bit “softer”, but you’ll avoid:

more water retention
higher BP
more AI dependency
worse lipids
and a less polished physique overall

About estrogen, don’t take Adex blindly just because Primo is gone. Watch symptoms, get bloodwork, then adjust calmly if needed.

Honestly, the smartest move here is stability, not forcing an “equivalent mg replacement”.

Shark

 

[xccdf]

To match the anabolic load of 400mg Primobolan, you need to add about 350mg of Testosterone for an 850mg weekly total. That is a lot.

Be careful, as dropping Primo removes its natural estrogen control.

Additionally, since finasteride blocks 5 alpha reductase, your massive testosterone surplus will heavily aromatize into estradiol instead of converting to DHT. Avoid blindly taking a full 1mg of Anastrozole to prevent crashing your estrogen.

A much safer clinical approach is to wait for high E2 symptoms to appear and cautiously introduce just 0.25mg on injection days, ideally verifying your exact needs with sensitive bloodwork a few weeks in.

I personally responded well to dropping Primo. It's a love hate relationship. I can drop it and not carry the E2 water, but that is my own genetics. Primobolan does cost and raws from China are picking back up after the bust awhile back.

Can you get bloodwork or post more details so we can help further my friend?