bigdaddyandfriends
Member
If primo or a metabolite is in fact an aromatase inhibitor then this would make perfect sense.Not at all. It crashes it when I run primo at 600mgs even with 750 test. Maybe as time goes on it will but I’m about 5 weeks in. Great results and libido with this stack and dosages.
At some threshold dose of AI, essentially all aromatase gets deactivated and no aromatization of testosterone (or trestolone/nandrolone) occurs. These are the doses of prescribed AI drugs to knock out essentially all (~99%) aromatase:
Exemestate/Aromasin - 25mg/day
Anastrozole/Arimidex - 1mg/day
Letrozole/Femara - 2.5mg/day
Not surprisingly, these are the doses for breast CA hormonal therapy where total E2 deprivation is the clinical goal. Primo is obviously not nearly as efficient/potent, but let's say for discussion it is 100mg/day = 700mg/wk.
At 350mg/wk primo, if half the aromatase gets deactivated, a test dose of 300mg/wk will still convert to half the E2 it would w/o primo, so similar E2 as 150mg/wk test - which is still far more than the body produces naturally and therefore more than sufficient to provide physiologic estradiol.. some need a little AI support even at a 'low' TRT dose of 140mg/wk test to keep E2 in range.
Now double to 700mg/wk and all the aromatase becomes deactivated, so E2 conversion from testosterone is halted, regardless of how much test is available. Ultimately the absolute dose of primobolan is far more important than the test to primo ratio.
Nandrolone may indeed offset these effects somewhat as it seems to either upregulate aromatase production and/or sensitize estrogen receptors to estradiol - which is why adding it to a cycle often results in high E2 symptoms ie gyno, water retention, acne, etc despite itself being a very poor candidate for aromatase. Hence why nandrolone-only cycles require extremely high doses to achieve physiologic E2 levels.
