There is an old pharmaceutical product that was available in Germany, but can not be obtained anymore. Ouabain /Strophanthin
"Ouabain /wɑːˈbɑːɪn/[1] or /ˈwɑːbeɪn, ˈwæ-/ (from Somali waabaayo, "arrow poison" through French ouabaïo) also known as g-strophanthin, is a plant derived toxic substance that was traditionally used as an arrow poison in eastern Africa for both hunting and warfare."
It was later found naturally occuring in the human body:
Key Paper: Gottlieb SS, et al. "Elevated concentrations of endogenous ouabain in patients with congestive heart failure." Circulation. 1992;86(3):846-849.
Details: Researchers measured plasma EO in 21 patients with severe heart failure (NYHA class III-IV), finding mean levels of 1.59 nM—over 3x higher than in controls. EO correlated inversely with cardiac index (r = -0.62) and positively with mean arterial pressure, but not with atrial pressures, suggesting a compensatory role in cardiac output regulation rather than simple volume overload.
"Ouabain /wɑːˈbɑːɪn/[1] or /ˈwɑːbeɪn, ˈwæ-/ (from Somali waabaayo, "arrow poison" through French ouabaïo) also known as g-strophanthin, is a plant derived toxic substance that was traditionally used as an arrow poison in eastern Africa for both hunting and warfare."
It was later found naturally occuring in the human body:
Key Paper: Gottlieb SS, et al. "Elevated concentrations of endogenous ouabain in patients with congestive heart failure." Circulation. 1992;86(3):846-849. Details: Researchers measured plasma EO in 21 patients with severe heart failure (NYHA class III-IV), finding mean levels of 1.59 nM—over 3x higher than in controls. EO correlated inversely with cardiac index (r = -0.62) and positively with mean arterial pressure, but not with atrial pressures, suggesting a compensatory role in cardiac output regulation rather than simple volume overload.