The most common side affect associated with HCG is gynecomastia. The concurrent intake of Nolvadex prevents gynecomastia, prevents/minimizes leydig cell desensitization and contiues the stimulation of pituitary LH once HCG has been discontinued. The typically reported sides, if encountered, are emotional unstability and acne outbreaks. I'm not sure how accurate these are since both possible during PCT. In addition, another possible but far less frequent side effect of Clomid are vision disturbances or blurred vision.
Each individual response is different.
Jenetic