I am a Crystal Healing & Herbalism Practitioner. Baldwins has a comprehensive list of supplements for various conditions and interactions between any herbal or prescription medications http://www.baldwins.co.uk/perl/go.pl/healthnotes.html?%2fuk%2fassets%2fhealth-condition%2ffemale-infertility%2f%7edefault
No caffeine and Vitamin E and checking the iron are recommended. Floradix tablets or liquid are a gentle way to supplement if additional iron is needed, it also comes without iron and includes Vitamin B and is a very useful tonic.
I would agree about the supplements. Holland & Barrett often have a buy one get one free offers http://www.hollandandbarrett.com/
and are high quality.
There are also herbal supplements that can be made into a tea (the most gentle way to take a herbal remedy) and if an improvement is made, supplements can be taken for convenience. I have written an article on fertility that includes herbal supplements http://cara-moore.suite101.com/herbal-remedies-for-fertility-and-menopause-a296647
Once pregnant there are certain herbs to avoid and that will help. http://cara-moore.suite101.com/herbal-remedies-for-pregnancy-and-childbirth-a297020
Hope this helps.
Cara E. Moore, BSYA (Crys.) (Herb.)http://www.crystalartsandhealth.org.uk