amen's websites market vitamin supplements and a branded range of other dietary supplements. these supplements have been promoted for a number of health benefits, including a claimed ability to prevent or stop alzheimer's disease—there is however no known benefit from taking such supplements except for specific substance deficiencies. neurologist robert burton has written that he was "just appalled" by the things offered for sale on amen's "big business" web sites, and harriet hall has said that amen prescribes "inadequately tested natural remedies" and "irrational mixtures of nutritional diet supplements" as part of his treatment.