I see some people are using castor oil. What kind are people using? I see swiss temples mentions topic and oral. What kind are you supposed to get for oral consumption?
Go for whatever is food grade and 100% pure and maybe cold pressed.
I don't know if oral or topical works better. But if you take it oral make it no more than ~2 ml/day, as in half a teaspoon. If you go above that it starts to have significant laxative effects.