IMO, the Swisse men's ultivite. I know this because it's helped to improve DH's sperm quality (judging by the tests he's done).

The acupuncturist/TCM/naturopath I've been seeing (she's specialised in fertility for 30 years) thinks menevit is a waste of money. Her opinion only, of course. She's also had DH on a naturopath supplement (Metagenic's Paternal Plus) and Omega-3 Plus capsules.