Deuterium, a.k.a. heavy hydrogen, is a naturally occurring stable – non-radioactive – variation of hydrogen. The atomic nucleus of hydrogen consists of one proton only, but the deuterium nucleus contains one proton and one neutron. This considerable, twofold mass difference causes significant differences in the physical and chemical properties of hydrogen and deuterium. Preventa, the world’s first drinking water product family with lowered deuterium content, was developed on the basis of an international patent by HYD LLC. Preventa drinking water was licensed by the Budapest Veterinary Health and Food Control Station in 1999, based on expert opinion of Fodor József National Centre of Public Health, Institute of Environmental Health, and National Institute for Food and Nutrition Science.

Deuterium-depleted water is produced by an energy-demanding technology based on differences in the physicochemical properties of normal water (H2O) and heavy water (D2O). Due to a boiling point difference of merely 1.5°C, the concentration of heavy water (with higher boiling point) is lower in the vapour phase and this fact is utilized for producing deuterium-depleted water. By repeating evaporation several times in so-called distillation columns, the deuterium content of water can be reduced to any level.

The numbers indicated in the names of Preventa drinking waters mean the deuterium content of that product in ppm units. Accordingly, Preventa 125 contains 125 ppm, Preventa 105 contains 105 ppm, and Preventa 85 contains 85 ppm deuterium, in contrast to the 140-145 ppm typical for surface waters – and hence, for ordinary tap water – in our geographical zone.

Research shows that decreasing the level of deuterium in the tissues and organs is a natural biological process. However, the body's ability to deplete deuterium decreases as we get older, sicker and get less exercise or sunlight. This natural system is the target of the deuterium depleting procedure. By changing the deuterium level of drinking water below the natural level, the deuterium content in the body can be kept low even if the said natural cell process is faulty. By proper choice and continuous consumption, deuterium depletion in the organism can be maintained for long periods.