**5. Acknowledgment**

The authors wish to thank Dr. Magda Kouřilova, PhD. for correction of the English language. Experimental work was supported by grants VEGA 2/0045/11; VEGA 2/0090/08; VEGA 2/0003/10; APVV-51-017905; APVV-3015-07, APVV-21-055205 and

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Imunoglukan® was donated from Pleuran s.r.o. company (Bratislava, Slovak Republic). Glucomannan was isolated by Martin Pajtinka (Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic). Pinosylvin and pterostilbene were prepared by Prof. Jan Šmidrkal (Institute of Chemical Technology, Prague, Czech Republic) and Ing. Juraj Harmatha, PhD (Institute of Organic Chemistry and Biochemistry, Academy of Sciences of Czech Republic). Coenzyme Q10 in the form of Li-Q-Sorb® was purchased from Tishcon Corp., USA and carnosine was purchased from Hamary Chemicals Ltd., Japan. Pycnogenol® was obtained from VULM, s.r.o., Modra, Slovak Republic. All other used plant-related compounds and extracts were provided by assoc. Prof. Daniela Kostalova (Faculty of Pharmacy, Comenius University, Bratislava, Slovak Republic).
