1. Iron extracts obtained by extraction with water or water-alcohol solvents, for use in the treatment or prevention of neurodegenerative diseases, where the specified neurodegenerative disease is a disease associated with accumulated proteins / peptides. 2. Iron extracts for use according to claim 1, wherein said neurodegenerative disease is Down syndrome, Huntington’s disease (BH), spinal cerebellar ataxia (SCA), especially SCA2, or amyloidosis, especially Alzheimer's disease (BA). 3. Iron extract according to any one of the preceding claims, wherein said disease is an initial / early form of dementia, such as mild cognitive impairment (UKI) in Alzheimer's disease. 4. Iron extract for use according to claim 1 or 2, wherein said extract is obtained from a herb of Sideritis spp. 5. Iron extract for use according to claim 3, wherein said extract is obtained from a herb of Sideritis spp. 6. Zheleznitsa extract for use according to any one of claims 1, 2 or 5 in the form of a medicine, food product, biologically active food supplement or an enriched balanced diet. Iron extract for use according to claim 3 in the form of a medicine, food product, dietary supplement or an enriched balanced diet. Iron extract for use according to claim 4 in the form of a medicine, food product, dietary supplement or an enriched balanced diet. Iron extract for use according to any one of claims 1, 2, 5, 7 or 8, further comprising St. John's wort extract, preferred1. Экстракты железницы, получаемые экстракцией водой или водно-спиртовыми растворителями, для применения при лечении или при профилактике нейродегенеративных заболеваний, где указанное нейродегенеративное заболевание является заболеванием, связанным с накапливаемыми белками/пептидами.2. Экстракты железницы для применения по п.1, где указанное нейродегенеративное заболевание является синдромом Дауна, болезнью Хантингтона (БХ), спинально-церебеллярной атаксией (СЦА), особенно СЦА2, или амилоидозами, особенно болезнью Альцгеймера (БА
