Vidalista CT 20 contains tadalafil 20 mg and is a product of Centurion Laboratories. The publicly available product information identifies Centurion Laboratories as the manufacturer of Vidalista CT 20 mg. Regarding who funds Vidalista CT 20 research: I could not find any publicly available record showing a separate research grant, university study, government funding, or named external sponsor specifically funding Vidalista CT 20 research. Like many generic medicines, it appears to be based on the already-established active ingredient tadalafil rather than a new drug discovery program. Research and development, formulation work, quality testing, and manufacturing activities are typically carried out by the manufacturer or its affiliated laboratories, but a specific funding source for this product has not been publicly disclosed. If you mean clinical trials proving tadalafil works, those were mainly conducted during the development of the original tadalafil medicine, before generic brands such as Vidalista CT entered the market. If you want, I can explain who funded the original tadalafil (Cialis) research and trials.