You're right Joe, that NDF is expensive. But i'll give you an example. NDF Plus, which has added support ingredients, is being used regularly in the autism community, and a lot of parents are finding that their childrens behaviour etc has been positively altered by a single drop once a day! That's not the case for everyone, but it's something i plan to use for my own depression and anxiety once i'm able to hack it. El-Essawy will give you Environ, i know virtually zilch about it, but the best mercury detox doctor here in Ireland is using it, and he's been sending a lot of patients to El-Essawy, with impressive results i've heard.