Evidence-based medicine has shown for many years that homozygous mutations of the HFE gene H63D are by no means negligible. Not only can it provoke, usually after a second hit, rather mild classical hemochromatosis, but it can also cause numerous other disorders of iron metabolism, such as Oslo-Syndrome. The latter is a severe disease which leads to multiple organ damages and is - for reasons that remain in the dark - not as known as Wilson's disease which is a very similar syndrome caused by copper.