Some say yes men should take prenatal vitamins, they have different nutritional needs than women — so couples can’t share the same supplements. There are key ingredients men should look for in prenatal or fertility vitamins, including antioxidants, zinc, and folate.
But even more so I think they should like women look at physical & mental health, maintain a healthy weight, reduce exposure to toxic substances, stop smoking, drinking alcohol or taking street drugs.

My partner was told to take zinc while we were struggling to conceive. Not long after he started we got pregnant, not sure if it was coincidence but worth a try. Please speak to your doctor before starting any natural remedies

There’s the male version of Elevit called Menevit. Not sure how much of a difference it makes because if there were more serious issues there’s not much you can take for that.

Yes, there are particular supplements for men, though I can’t remember the name. Check a chemist.