It’s a solid mild growth cycle. But whether you stay lean is 100% about your diet, not the gear. Lower test and primo will help you not blow up like a water buffalo though, but fat gain comes down to diet.The biggest thing is tracking your estrogen levels as one of primos metabolites is an AI. How strong the effect is and how low it makes your estrogen go is highly individual. On a bulk I wouldn’t want my estradiol below 40. I personally like it even higher than that but 40 works. Estrogen is also important for the conversion of GH to IGF-1 so you don’t want to tank it. So id do blood work after week 4 and see where everything is at and if your estradoil isn’t low id bump the primo up a bit.

Most will say its 95% food and gym

Body fat comes down to your diet and training protocol … not how high you run your doses. The drugs don’t decide your leanness, your body’s response to the whole setup does.

End of the year last year did a long blast of test e @500 npp @400 and primo @400 and 5 ius of growth for about 20 weeks - great lean size, I posted a small log about it in my pics.

Iin hindsight I wouldn’t have ran the primo, at least at that dose. I would have saved it to run during a cut or recomp at a higher dose. Maybe it wasn’t the best batch, maybe it was counterfeit. I just didn’t think it enhanced my appearance much. Could have saved some money and gotten more size out of EQ.

Primo works great for some as an AI but not all.

I gained roughly 20lbs (while dropping body fat)
NPP did the heavy lifting imo. I’m running primo currently at a much higher dose than above and can say it’s a totally different compound once you go over a certain threshold.
If your dead set on the primo give it a go, that was just my personal antidote.
Do your research, get bloods done, no one knows your body better than you bro