Antronex contains Yakriton, a bovine liver fat extract discovered in the 1920's by Japanese researchers. Yakriton has been shown to help maintain a healthy liver via its blood filtering and affect on histamine. Histamine is released when tissues become damaged, inflamed, or are the subject of an allergic reaction. Histamine is involved in a myriad of physiological conditions.
Its supposedly taken for allergies and related anti inflammatory stuff. But if one searches for a little "evidence" all one comes up with is pseudo science and anecdotes. Most of the references are links to places selling the product containing Yakriton, derived from beef liver fat. Its been around for a while, sold mostly by alternative health professionals. Until there's some more substance to the claims, I'll pass.