Herbots Zell Oxygen 250 MLZell Oxygen is a natural vitaminized yeast preparation Has already for a long time been used as a recovery means in the medical world and as an energy activator in the sports world It is composed of living yeast cells, in which enzymes and coenzymes are the most important building stones Enzymes are substances which enable human, animal and vegetable cells to realise biochemical processes Provides the best source of B complex vitamins