TTC Exhaustion

My husband and I have been TTC for a year and a half now but still no luck.

I have two boys previously to marrying my husband and had no conception issues. Is there anything you guys would recommend for him to take (daily supplements, etc.) that could help?

We're desperate and getting extremely discouraged. He will be 29 next year and is getting more and more nervous about if conception will be an option. We have health insurance but as you guys know, health care will almost never touch infertility costs, especially when it comes to male infertility.

Give us any tips/advice, anything would be greatly appreciated!