I think doing the hCG protocol too many times too close together can be damaging in many ways, mostly because the very low calorie diet itself is a taxing protocol on the body- this can drain/strain hormone levels.
That said, the use of hCG by itself in moderation I don’t think presents a problem – hCG in much larger doses is actually used a fertility treatment for women trying to get pregnant at fertility clinics all the time. And the other kind of trippy thing is- this isn’t a medical study that proves anything of course, but it’s worth saying, we have heard quite a few times of ladies accidentally becoming pregnant while on the hCG protocol, even in cases where they had been trying for years to pregnant and couldn’t. So it has made me wonder if even in these small dosages if it actually increases fertility a little!
I hope this helps!