I haven't seen a premix with HCG tbh, didn't know that was even viable? I have seen them with an AI included, but I would personally avoid that and control estrogenic sides as required. On a TRT dose I'd doubt you would see much aromatizing but everyone's different, would also depend on your current level of fitness, body fat and general health. I can currently run test at 600mg needing very little intervention with an AI, I find there can also be a transitionary period with your body were you may initially need an AI, but this becomes less so as your body becomes accustomed to the change (some initial soreness, gland swelling and water retention). Somewhat anecdotal, but that's my experience. I also don't use HCG anymore, having more children isn't on the cards for me, something to think about too if that's why you're specifically concerned about adding in HCG and doing long term TRT - do you need it? If you're ok with some test atrophy, and potentially being infertile I wouldn't bother as it can exasperate other side effects such as gyno. When I did use it, it had to be reconstituted and stored in a fridge, so again I'm not sure how that works with being added to an anabolic compound for IM injection. As you've said, probably best to just go with pharma if you are going to include it and use it separately. Personally I always go for single compound products, never bother with blends, just buy the compounds you want to use and run them at the doses you want - easier to control.
