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\begin{document}
\title{$^{57}$Fe hyperfine parameters in vitamins and dietary supplements}
\author{\underline{Marlena Michałowska}}
\affiliation{Institute of Physics, University of Silesia, Katowice, Poland}
\author{M. Kądziołka-Gaweł}
\affiliation{Institute of Physics, University of Silesia, Katowice, Poland}
\begin{abstract}
M\"ossbauer (nuclear gamma-resonance) spectroscopy was used to study various industrial samples of vitamins and dietary supplements containing iron ions which are use in treatment of anemia.. Determination of the iron state (Fe$^{2+}$ or Fe$^{3+}$) in medicaments is important for evaluation of pharmaceuticals quality. The investigated samples containing ferrous bisglycinate, ferrous fumarate, ferrous gluconiate and ferric diphosphate are non magnetic in room temperature. $^{57}$Fe hyperfine parameters of studied pharmaceuticals indicate on existing of major iron ferrous compounds. However, M\"ossbauer spectra of investigated samples demonstrated presence of additional ferrous and ferric components probably related to impurities or to partially modified main component.


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