Weltmine is a form of Phentermine, as far as we can tell manufactured and sold in Korea. Phentermine first received approval from the American FDA in 1959, and since, it has been used and sold by multiple pharmaceuticals and companies under a number of different names ranging from King Pharmaceuticals to SmithKline Beecham. Under certain names, it was removed from the American market in 1998. There have been virtually no studies performed since those conducted in 1959. The most recent study was conducted on its possible interaction with fenfluramine or dexfenfluramine, otherwise known as Fen-Phen. However, Fen-Phen was removed from the market in 1997 after 24 cases of heart valve disease were reported. Weltmine is only to be dispensed through prescription for short term use as an appetite suppressant, and it should be closely monitored by your doctor.