I don't know about anything that will help you conceive twins. That is usually a hereditary thing I think.

I dont really know whether there is way to ttc for twins - Sorry

But star is right it do runs in family.

Do you have twins in your family or DHs family?

Identical twins are completely random and fraternal twins run in the mother's family. The woman has to hyper ovulate (give off more than one egg in a month) and them both to be fertilized for fraternal twins.

There is no natural way to have twins on purpose.

Some women have an increased chance of fraternal twins and higher order multiples if they take fertility drugs. However, a doctor will not prescribe those if they are not necessary for a fertility issue.

Natural ways to try and help concieve twins are:

Increase your calcium intake

herbal tablet called "Vitex" helps release more than one egg( have also heard most people have girls who concieve on it)

Agida a wild yam( not sweet potatoe) the country it is grown in has the highest twin rate in the world. It also promotes(like vitex) more than one egg being released.