A list of foods that can cause hyperovulation:

Increase Cholesterol – can be good for fertility but bad for your heart

Whole grains

Wild yams

Wheat germ

Maca

Tofu

Soy isoflavoes

Walnuts

Full fat dairy products

What is Cassava:  Cassava is a type of Yam that is eaten in parts of Africa.  One tribe that eat the yam as a staple of their diet have a high number of natural multiple pregnancies.  The tribe intake is believed to be around 900 to 1,000mg per day.  The yam is believed to cause hyper-ovulation   

What is hyper-ovulation:  this is when you body releases more than one egg at the time.  

Pro:  More eggs means you have more chances to get pregnant.  

Con:  However, more eggs means you also could be more likely to conceive twins (or more). This con doesn't put me but I understand that some people might be.

Is it dangerous:  The cassava yam is dangerous if eaten raw as it produces cynaide.  However, if prepared correctly it is perfectly safe. It must to be cooked correctly and people in Africa have been doing this for years.  

Apparently, the yam doesn't taste very nice even if you manage to cook it safely.   I've tried cassava crisps and liked them (BBQ flavour from Ocado).  A lot of Americans eat a pudding called tapioca which is made from cassava.  

However, I wouldn't trust myself to cook the yam and be safe so I'd opt for a supplement that has been prepared by someone who knows what they are doing.

Article by Time Specials listing Cassava as number 8 in a list of top ten deadly foods:  http://www.time.com/time/specials/packages/article/0,28804,1967235_1967238_1967250,00.html

How much to take:  Based on the tribes intake, it would appear to be safe to take 900 to 1,000mg.  However, a number of women have reported taking a lot more than this.  I guess it is up to your personal preference and to make your own judgement.  You can start eating cassava or taking supplements at any stage of your cycle and take it throughout your pregnancy.

I've decided to give this a go.  I've ordered my cassava supplements from the site below.  When they arrive, I plan to take a 500mg capsule, two to three times a day.  

Where to get it and get 10% off:

The website is:  www.cassavashop.com