I guess you "can" but I will tell you this, it's not "sound" medical practice
We never mix oils and water in the medical setting bc the risk of abcess or infection increases.
Im sure you can get away with it, but you are more likely to get bit on the ass by doing this. You are more likely to have a side effect is what I am saying
Water based is very risky overall IM. Even if you are sterile, you are asking for issues. I am saying this based on thousands of clients over the last 25+ years and also patients in the hospital. IM shots with water based compounds can cause issues and fast.
Ur best off separating them and also going subQ when you can. Of course BPC and Alpha Thymosin respond better IM. I also will say that it is my personal expereince that shooting HCG, IM, instead of Subq works better. I have no study or medical proof of that, I just know over the last 20 years how I respond. You may or may not respond the same.
Consider that some water based products will indeed work better then subq, though most of them are very much similar.