1. A systematic review of vitamin D status and dietary intake in various Slovenian populationsMaša Hribar, Evgen Benedik, Matej Gregorič, Urška Blaznik, Andreja Kukec, Hristo Hristov, Katja Žmitek, Igor Pravst, 2022, review article Keywords: vitamin D, dietary intake, serum 25-hydroxy-vitamin D, vitamin D deficiency, systematic reviews, Slovenia
Published in DiRROS: 24.11.2025; Views: 149; Downloads: 61
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4. Total and free sugars consumption in a Slovenian population representative sampleNina Mikec, Hristo Hristov, Matej Gregorič, Urška Blaznik, Nataša Delfar, Barbara Koroušić-Seljak, Eric L. Ding, Nataša Fidler Mis, Igor Pravst, 2020, original scientific article Keywords: free sugar, sugar intake, dietary intake, 24-hour recall, nutrition survey, public health, EU Menu, Slovenia
Published in DiRROS: 18.11.2025; Views: 141; Downloads: 63
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5. Nutrihealth study : seasonal variation in vitamin D status among the Slovenian adult and elderly populationMaša Hribar, Hristo Hristov, Matej Gregorič, Urška Blaznik, Katja Zaletel, Adrijana Oblak, Joško Osredkar, Anita Kušar, Katja Žmitek, Irena Rogelj, Igor Pravst, 2020, original scientific article Keywords: 25(OH)vitamin D, biomarkers, dietary survey, public health, EU Menu, Slovenia, Europe
Published in DiRROS: 18.11.2025; Views: 151; Downloads: 106
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7. Comparative bioavailability of different coenzyme Q10 formulations in healthy elderly IndividualsIgor Pravst, Juan Carlos Rodríguez Aguilera, Ana Belen Cortes Rodriguez, Janja Jazbar, Igor Locatelli, Hristo Hristov, Katja Žmitek, 2020, original scientific article Abstract: Coenzyme Q10 (CoQ10) plays a central role in mitochondrial oxidative phosphorylation. Several studies have shown the beneficial effects of dietary CoQ10 supplementation, particularly in relation to cardiovascular health. CoQ10 biosynthesis decreases in the elderly, and consequently, the beneficial effects of dietary supplementation in this population are of greater significance. However, most pharmacokinetic studies have been conducted on younger populations. The aim of this study was to investigate the single-dose bioavailability of different formulations of CoQ10 in a healthy geriatric population. A randomized, three-period, crossover bioavailability study was conducted on 21 healthy older adults (aged 65-74). The treatment was a single dose with a one-week washout period. Three different formulations containing the equivalent of 100 mg of CoQ10 were used: Q10Vital water-soluble CoQ10 syrup (the investigational product-IP); ubiquinol capsules (the comparative product-CP); and ubiquinone capsules (the standard product-SP). Ubiquinone/ubiquinol was followed in the plasma for 48 h. An analysis of the ratio of the area under the baseline-corrected concentration curve (deltaAUC48) for total CoQ10 and a comparison to SP yielded the following: The bioavailability of CoQ10 in the IP was 2.4-fold higher (95% CI: 1.3-4.5; p = 0.002), while the bioavailability of ubiquinol (CP) was not significantly increased (1.7-fold; 95% CI: 0.9%3.1, p = 0.129). No differences in the redox status of the absorbed coenzyme Q10 were observed between formulations, showing that CoQ10 appeared in the blood mostly as ubiquinol, even if consumed as ubiquinone.
Keywords: coenzyme Q10, CoQ10, Q10Vital, ubiquinone, ubiquinol, bioavailability, water-soluble formulations, the elderly
Published in DiRROS: 18.11.2025; Views: 143; Downloads: 67
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8. Dietary lutein supplementation protects against ultraviolet-radiation-induced erythema : results of a randomized double-blind placebo-controlled studyKatja Žmitek, Janko Žmitek, Mirjam Rogl-Butina, Hristo Hristov, Tina Pogačnik, Igor Pravst, 2020, original scientific article Keywords: lutein, minimal erythema dose, photoprotective activity, viscoelasticity, dermal density, carotenoids
Published in DiRROS: 18.11.2025; Views: 170; Downloads: 61
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