1. The effect of dietary intake of coenzyme Q10 on skin parameters and condition : results of a randomised, placebo-controlled, double-blind studyKatja Žmitek, Tina Pogačnik, Liljana Mervic, Janko Žmitek, Igor Pravst, 2017, izvirni znanstveni članek Povzetek: Coenzyme Q10 (CoQ10) is a natural constituent of foods and is also often used in both functional foods and supplements. In addition, it is a common ingredient of cosmetics where it is believed to reduce the signs of skin ageing. However, the existing data about the effect of dietary intake of CoQ10 on skin parameters and condition are scarce. To gain an insight into this issue, we conducted a double-blind, placebo-controlled experiment with 33 healthy subjects. Our objective was to investigate the effects of 12 weeks of daily supplementation with 50 and 150 mg of CoQ10 on skin parameters and condition. Study was conducted with a water-soluble form of CoQ10 with superior bioavailability (Q10VitalVR ). While the results of some previous in vitro studies showed possible protection in UVB response, we did not observe significant changes in the minimal erythema dose (MED). On the other hand, the intake of CoQ10 limited seasonal deterioration of viscoelasticity and reduced some visible signs of ageing. We determined significantly reduced wrinkles and microrelief lines, and improved skin smoothness. Supplementation with CoQ10 did not significantly affect skin hydration and dermis thickness.
Ključne besede: coenzyme Q10, CoQ10, antioxidant, skin health, anti-ageing
Objavljeno v DiRROS: 27.11.2025; Ogledov: 101; Prenosov: 48
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2. Effects of a combination of water-soluble coenzyme Q10 and collagen on skin parameters and condition : results of a randomised, placebo-controlled, double-blind studyKatja Žmitek, Janko Žmitek, Mirjam Rogl-Butina, Tina Pogačnik, 2020, izvirni znanstveni članek Ključne besede: skin, coenzyme Q10, collagen peptides, skin health, dermis density
Objavljeno v DiRROS: 18.11.2025; Ogledov: 152; Prenosov: 77
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3. 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, izvirni znanstveni članek Ključne besede: lutein, minimal erythema dose, photoprotective activity, viscoelasticity, dermal density, carotenoids
Objavljeno v DiRROS: 18.11.2025; Ogledov: 141; Prenosov: 54
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4. The effect of a 12-week dietary intake of food supplements containing collagen and MSM on dermis density and other skin parameters : A double-blind, placebo-controlled, randomised four-way study comparing the efficacy of three test productsTina Pogačnik, Janko Žmitek, Hristo Hristov, Petra Keršmanc, Mirjam Rogl-Butina, Katja Žmitek, 2023, izvirni znanstveni članek Povzetek: Dietary supplementation with collagen has been gaining popularity as an anti-ageing remedy. The aim of this randomised, double-blind placebo-controlled four-way study was to investigate and compare the effects of 12-week daily dietary supplementation with products containing 10 g hydrolysed fish collagen (HC) or a combination of 5 g or 10 g HC with 1.5 g methylsulphonylmethane (MSM) on dermis density in healthy human subjects. The secondary objectives were to investigate the effects on a variety of other skin parameters. The study results showed improved dermis density, skin texture and reduced wrinkles for all the active products. However, products containing MSM were superior in the improvement of skin thickness and roughness, and a higher dose of HC combined with MSM was crucial for improvement in hydration. On the other hand, no significant effects of the supplementation on viscoelasticity and transepidermal water loss were determined with any of the products.
Ključne besede: collagen, MSM, ageing-skin, density, texture, wrinkles
Objavljeno v DiRROS: 10.11.2025; Ogledov: 164; Prenosov: 79
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5. The effects of dietary supplementation with collagen and vitamin C and their combination with hyaluronic acid on skin density, texture and other parameters : a randomised, double-blind, placebo-controlled trialKatja Žmitek, Janko Žmitek, Hristo Hristov, Mirjam Rogl-Butina, Petra Keršmanc, Tina Pogačnik, 2024, izvirni znanstveni članek Objavljeno v DiRROS: 07.11.2025; Ogledov: 220; Prenosov: 78
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