Cholesterol is indispensable for a regular function of blood vessels in the human body, which it helps process fats, and plays an important role in the construction of cell membranes. Without cholesterol it would be difficult to maintain a normal level of hormones and even to regulate the quantity of vitamin D which is generated naturally in the body. Two basic types are distinguished – LDL, the “bad” cholesterol, and HDL, the “good” one. The LDL is characteristic for its ability to build up on artery walls if overproduced. We refer to an increased LDL level if its quantity exceeds 3.4 mmol/L. In contrast, the HDL cholesterol assists in rerouting excess cholesterol back to the liver thus preventing its deposition in blood vessels. The HDL value should possibly be high, at least 1.2 mmol/L in men and 1.0 mmol/L in women. Natural biomaterials, such as those taken from garlic (or, even better, from its fermented black form), from the leaves of the silver birch (Betula pendula), from boswellia, and from green tea, are highly conducive to maintaining an optimal cholesterol level.