Basic multivitamin (very difficult to get the full RDA every day through diet, plus vitamin D is key as I work indoors and wear spf 50 facial sunscreen daily)
Omega 3 capsules (as above, don't religiously eat two portions of oily fish a week, so supplements help as an insurance policy)
Probiotic (Bio acidophilus forte or Optibac, as recommended to me by a consultant gastroenterologist)
When I was doing IVF I was rattling with supplements (most of which I'm sure I just pissed straight out!)
10,000iu vitamin D3, 1000iu vitamin E, high dose omega 3, extra selenium, 5mg prescription folic acid, 6g l-arginine, resveratrol, CoQ10 ubiquinol, melatonin, n-acetyl cysteine, 4g inositol - and probably more I can't remember! Total waste of money I'm sure.
DH took vitamin C, zinc and selenium as recommended by the fertility specialist, and the selenium made his nails grow ridiculously quickly, and cleared up any patches of dry skin! Makes sense as selenium is the active ingredient in anti dandruff shampoo - he had the silkiest elbows while he was taking it (and constantly trimming his nails!)