of soft extract with a dry matter content of 42 6 this was dried with the aid of maltodextrin in a ratio of 70 native 30 maltodextrin the extract obtained in this way was tested in the in vivo model described in example 1 the results are given in example 7 10 kg ironwort 50 50 mixture of sideritis scardica l and s euboa l was percolated exhaustively at 50 u00b0 c with 300 liters ethanol 20 v v the eluate was drained off from the drug and liberated from drug residues the percolate was gently evaporated in a partial vacuum and all solvents removed by adding water several times this yielded 3 2 kg of soft extract with a dry matter content of 56 this was dried with the aid of maltodextrin in a ratio of 70 native 30 maltodextrin the extract obtained in this way was tested in the in vivo model described in example 1 the results are given in example 7 the mouse strain examined in example 1 is changed in such a way that the amyloid deposits typical for alzheimer 39 s disease are distinct after approx 100 days of life treatment commenced after 50 days of life the sideritis extracts as in examples 4 6 lower the soluble fraction of the u03b2 amyloid compared with the control treatment with water while s scardica produced a reduction.