Powdered newt supplement

From Memory Alpha, the free Star Trek reference

Powdered newt supplements were commodities.

In 2373, Quark's investments in antimonium options, quadrotriticale futures and powdered newt supplements were wiped out, leaving him "up to his lobes in debt." (DS9: "Business as Usual")

Powdered newt supplements were likely nutritional supplements made of ground-up newts, which were small amphibians.