oligodynamic

adjective

oli·​go·​dy·​nam·​ic -dī-ˈnam-ik 

1

: active in very small quantities

an oligodynamic germicide

2

a

: produced by minute quantities

oligodynamic action of silver in disinfecting water

b

: of or relating to the action of such quantities

3

: of, relating to, or being produced by the specific activity of an oligodynamic substance

oligodynamic effects of metals on bacterial growth