The natural products studied, along with vitamin C, were silibinin — derived from milk thistle seeds — and
caffeic acid phenyl ester — or CAPE — derived from honeybee propolis.
Focusing on energy - transfer, they measured the impact on cell lines in a laboratory of 7 substances, the clinically - approved drug stiripentol, 3 natural products —
caffeic acid phenyl ester (CAPE), silibinin and ascorbic acid — and experimental pharmaceuticals, such as actinonin, FK866 and 2 - DG.