Thioflavin T (ThT) dye fluorescence is used regularly to quantify the for-mation and inhibition of amyloid fibrils in the presence of anti-amyloido-genic compounds such as polyphenols. However, in this study, it was shown, using three polyphenolics (curcumin, quercetin and resveratrol), that ThT fluorescence should be used with caution in the presence of such exogenous compounds.