Every now and then I see guys talking about getting blood work done to check testosterone levels and what not. How common is this? Before swallowing the pill, I never really knew that was a thing. What should I look for, and how would I go about getting it done?

On a sidenote I just got off SSRIs for the first time in 2 years. I was told that they could be the reason I don't feel like I have that edge anymore. However, I'm still curious about getting blood work done if that could help.