In 2004, my pituitary stopped secreting LH which resulted in low testosterone level, so I was prescribed 1/2 sachet Testogel (25mg trans-dermal testosterone) per day.
In 2016, I stopped using it after deciding that solitude was preferable to being in a relationship. I thought "What do I need testosterone for?"
I gradually developed pains in joints that had been damaged over the years and my left shoulder became frozen for a while. I also felt very slightly unwell, but not enough to do anything about it. I thought it was just symptoms of psoriatic arthritis and didn't associate the deterioration with me stopping using Testogel as it was gradual.
Then, on March 15th 2019, I read https://mobile.twitter.com/nick_krontiris/status/1106498415565914113
I started using Testogel again. Now I know what I need testosterone for! My joint pains have decreased and I'm feeling better & more relaxed.
EDIT: The decrease in joint pains was temporary.
EDIT: Feeling great relief was accompanied by an increased tolerance to loud music & dazzling headlights. I think my cortisol level has dropped and I've experienced this before! See Supplement Alert! Carlson Labs Vitamin K2 MK-4 (Menatetrenone).
If you're on Twitter and you're interested in studies on diet, nutrition, training etc, follow Nick Krontiris as he posts lots of them each day, along with analysis commentary.