We can agree to disagree on the extent of the impact of environmental chemicals. Recent research has certainly been heading that way as a way to explain the increasing epidemic of endocrine issues. I think the larger point I was trying to make was that we are not talking about just "getting older" and decreasing T levels. This is a disease process that lowers T far below what is considered normal for a given age.

You keep repeating the same thing over and over again, and yet I don't think you've offered a single reference to a journal article or anything else to support your position (my apologies in advance if you have and I just missed it). Every article I've found on the subject has not identified a single "disease process" that is causing lower T levels. And, across the population, it would appear that T levels are about 17% lower or so, not exactly what I would call "far below."

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Taco cat spelled backwards is....taco cat.

So the solution to chemicals (such as discarded pharmaceuticals) in our environment damaging our health is putting more chemicals into our body? Interesting, I hadn't considered that option. My approach is to try to avoid putting anything artificial into my body, drink organic milk, do not eat farmed fish, eat limited meat and poultry, only hormone and antibiotic free. The low sperm count seems like a bonus, at my age I don't want to accidentally have a kid.

No peer reviewed paper will be found.

Unless you have primary hypogonadism you should not be taking testosterone supplementation over the longer term. In the setting of testosterone supplementation and sports competition it is banned and rightly regarded as cheating.

Just so that everyone is on the same page here is a link to a succinct summary.

https://www.mayoclinic.org/...-causes/syc-20354881

My point is that primary causes are infrequent. From what I've read on this thread people seem surprised that obesity and sleep apnoea (itself associated with obesity and alcohol) can cause low testosterone. They are listed as secondary causes, in other words reversible either by lifestyle changes or medication (pituitary/hypothalamus causes). Secondary causes should always be addressed before testosterone is prescribed. Unfortunately with pervasive quick fix medicine testosterone is often the first treatment offered to patients. That's not good medicine and there's no way around it you will be regarded as cheating in competition if caught.

For people genuinely in this position and taking testosterone is the only thing that gives them more energy to attempt to change their lifestyle then that's the best of a bad situation. I support that as a pragmatist but don't enter competitive races until your secondary cause has been addressed and you no longer need testosterone.

The rest is cheating. Full stop.

Ride in SoFL with fast riders and you'll quickly conclude that the whole field is juiced (or at least most of it).