I’ve never heard that it increases cortisol. Where did you hear that? Anyway, I’d think it could be helpful in the short term on PCT due to the increased food intake most experience helping to not lose as much muscle post-cycle. But the other thing is that most also report improved sleep from MK, which would help recovery, which is generally lacking in the post-cycle window. The actual gains from GH tend to take longer to manifest, so you just need to weight out what would benefit you most from short term supplementation.