Rippere V
Med Hypotheses. 1981 Jun;7(6):819-23. doi: 10.1016/0306-9877(81)90092-x.
Placebo-controlled studies of effects of monosodium L-glutamate (MSG) and mixed synthetic food dyes in humans which have led to claims that these additives are safe in general use may be questioned on 3 methodological grounds: both active substance and placebo may be inadequately specified in published reports and potent common food allergens are used as placebos.