It concludes in this regard that the credibility of the megavitamin proponents is low. It also criticizes established science showing that Megavitamin therapy lack any health benefit. Vonnegut first attributed his recovery to orthomolecular megavitamin therapy and then wrote "The Eden Express". Megavitamin therapies were also publicly advocated by Linus Pauling in the late 1960s. Berger advocated dangerous megavitamin supplements for different ills which were unsupported by scientific evidence. Megavitamin doses are far higher than the levels of vitamins ordinarily available through western diets.