The present invention relates to the use of individual fumaric acid derivatives or mixtures thereof for preparing a pharmaceutical composition for treating mitochondrial diseases, especially for treating Parkinsons syndrome, Alzheimers disease, {HEAD ~ Chorea Huntington disease}, retinopathia pigmentosa and {TAIL ~ mitochondrial encephalomyopathy} 
The present invention relates to the use of individual fumaric acid derivatives or mixtures thereof for preparing a pharmaceutical composition for treating mitochondrial diseases , especially for treating Parkinsons syndrome , Alzheimers disease , { HEAD ~ Chorea Huntington disease } , retinopathia pigmentosa and { TAIL ~ mitochondrial encephalomyopathy }
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