Some, semi-common conditions that affect a good portion of society, and more who are non optimal excercisers: methylation problems (active folate, B12, b6 issues pyrroles (zinc, active b6, gla and some magnesium) (see Walsh protocols for a wide range of conditions from variouse malfunction, including sulphication issues, includes methylation) these are issues common in autism spectrum disorders, with Asperger’s being part of the disorder, I suspect trials on University students that be skewed by this), nor-adrenalin, copper vitamin C, iron or zinc and other issues, and people with ATP dysfunction, such as from the virus associated with chronic fatigue. Either a supplement addresses issues, or the underlying physiology might have to run smoothly to maximise it’s affect.
When your body has enough testosterone, the brain does not send the LH signal to your testicles. Therefore, you will not make any testosterone until your levels drop to below normal and the signal returns, stimulating production. Since you are getting testosterone from an outside source, your brain is most likely not sending that signal to your testicles. Over time, the old adage of “use it or lose it” comes into play and your testicles will shrink in size. The time is different for every man and the amount of “shrinkage” is different for every man. Fortunately, the HCG will quickly restore the size and function.