THE presence of a saponin in the seeds of Trigonella Foenum græcum (Leguminosæ) was first reported by Wunschendorff 1, who had subjected the defatted seeds to a process of extraction with alcohol.

For example, recent studies show that certain saponins are highly effective ... They are toxic compounds typical of solanaceous plants and are also found in potatoes, tomatoes and eggplants.

The ASPCA warns that these popular plants are dangerous to pets. Aloe vera is safe for pets in certain forms, like gel, but the saponins and anthraquinones found in the plant leaves are poisonous.