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Vitamin C is one of the best known nutrients of all and it contributes to a variety of tasks in the body, e.g. for the immune system and energy metabolism or collagen formation. Vitamin C also contributes to the protection of cells from oxidative stress. However, it cannot be produced by the body itself, but is mainly obtained from fruit and vegetables.1
Vitamin C is a water-soluble vitamin, also known as ascorbic acid.1
Selenium is an essential component of selenoproteins. To date, 25 selenoproteins have been identified in humans. Many selenoproteins are involved as enzymes in redox reactions. However, other selenoproteins also function independently of enzymes.2
Selenium contributes to the protection of cells from oxidative stress. This is because the trace element acts as a co-factor for various enzymes. A healthy immune system and thyroid are also dependent on a sufficient supply of the micronutrient.
Quercetin (from the Latin quercus, oak) is a secondary plant substance and belongs to the group of flavonoids.3
The average daily intake of quercetin in the diet is estimated to be around 10-20 mg/day. However, it can vary greatly depending on the diet and the quality of the food. Apples (approx. 4-5 mg/100 g), berries (3-4 mg / 100 g), grapes (2 mg/100 g), broccoli and onions (1.5-2 mg /100 g) contain a lot of quercetin.3
OPTAMINS Quercetin + Vitamin C + Selenium does contain Quercetin from natural, purely plant-based extract of the Japanese string tree (Sophora japonica L.) with at least 95% quercetin.
1 DGE FAQ Selected questions and answers about Vitamin C www.dge.de/gesunde-ernaehrung/faq/vitamin-c/
2 Schurgast, H., & Zimmermann, M., Burgerstein’s Handbook of Nutrients, 14th edition, p. 365ff.
3 Schurgast, H., & Zimmermann, M., Burgerstein’s Handbook of Nutrients, 14th edition, p. 228ff.