 Vialva et al evaluated the potential utility of an Achillea millifolium, Yero, extract in the control of H. Pylori infection. The Agarwell diffusion's bioassay was applied to determine the antimicrobial activity of Yero extracts. The supercritical anti-solvent fractionation process of Yero extract was made to give two different fractions, with polar phenolic compounds and monitorpenes and sesquiterpenes, respectively. Phenolic compounds were identified by HPLC-SMs by using the accurate masses of M-H, minus ions and the characteristic product ions. However, some of the reported product ions seem to be disputable, as described below. This article was authored by Rafl Fransky and Monika Bisturda-Busak.