Never heard of ppl getting gyno from it, HCG pretty much does the same thing clomid does(brings back up natural test levels)..but it is also used during a cycle to help clean out receptor sites. Clomid is normally only run after a cycle to bring back up natural test and as an anti-e, HCG is commonly used in longer cycles in the middle to help promote gains in the second half when you have shut down and gains have slowed.