Ferrdrakon, Ferrdrakon K, KramerDrak and Daydrakon can be kept unopened for at least 2 years after production^*.
Eudrakon N and P can be kept unopened almost indefinitely, Eudrakon P also when opened.

After opening, the solutions should be used up within six months if possible (exception Eudrakon P). If possible, please buy containers which you can use up within this time.
If this is not possible, fill your daily requirement in smaller containers and open the storage container as infrequently as possible.

A darkening in the colour of the solutions and even blackening is not a sign of spoilage but a normal ageing process of the solutions and has no influence on the effect of the compounds.

The combination of chelator with EDTA structure and iron salt is sensitive to light. The energy consumption through light absorption destroys the EDTA structure with a loss of chelator properties (this process is known as photochemical decarboxylation).

^*Stored correctly, i.e. as dark as possible and at room temperature or cooler.

The new plastic labels contain a unique serial number. With this serial number you can find the relevant use-by dates of every individual bottle here.