Can a man take an estrogen blocker to increase slightly low t levels, or is testosterone the only true way to raise levels?do some men take only that?

Only testosterone: Man should stay with testosterone at this point if really needed, majority of men make enough testosterone to function.

Yes, no, yes: There are many ways to increase testosterone if it's proven necessary. It's our job to understand your specific needs and thus develop a regimen that works for you. Testosterone supplementation can render you infertile so if you want more kids, i wouldn't recommend it. In someone w/higher estrogens, an aromatase inhibitor is a consideration but only after you review risk vs benefit w/your provider.