Vitamin C is water-soluble and has a hydrophilic character, which limits its absorption from the intestine into the bloodstream due to the intestinal lipid barrier and specific transporters. For example, with a single oral dose of 1000 mg, up to 80% may be excreted without being effectively utilized by the body. The goal of liposomal technology is to "lend" vitamin C a lipophilic character, enabling liposomal absorption, which is less limited by the capacity of intestinal transport molecules and allows significantly higher amounts of vitamin C to be absorbed. Liposomal absorption thus helps maintain much higher levels of vitamin C in the body, enhancing its availability for antioxidant protection of healthy cells—especially for the immune and nervous systems. At the same time, gradual and efficient absorption is gentler on the kidneys and the digestive tract.

The key factor in evaluating the quality of a product is not so much the production technology itself, but rather the evidence that the product ensures a sufficiently high level of bioavailability, specifically the plasma concentration of vitamin C in the blood. This issue was addressed in a published study (Boženský et al., 2021), which evaluated plasma concentrations of vitamin C after a single dose (1 gram). The results confirmed the high bioavailability of liposomal absorption of vitamin C in the case of RosaCelip-LD (Lipo C Askor Forte).

Vitamin C is an essential physiological active substance for the human body, which it cannot synthesize on its own. Therefore, we rely on its daily supplementation.

Vitamin C is necessary for antioxidant protection against oxidative stress, for the proper functioning of the immune and nervous systems, for reducing fatigue and exhaustion, and for collagen production, which is crucial for the strength of tissues such as blood vessels, cartilage, bones, skin, and hair. Without vitamin C, basic immune cells (leukocytes), including phagocytes that eliminate foreign substances (such as viruses and bacteria), would not function. Additionally, the lymphocyte-based arm of the immune system—responsible for defense against viruses, bacteria, and even tumor cells—would also be impaired. High concentrations of vitamin C are maintained in nerve cells, especially in the brain, and its role in supporting the nervous system has been demonstrated not only in adults but also in school-age children.