Marketed as a thyroid formula, Biotest T2 claimed to provide a natural alternative to prescription medications designed to treat an underactive thyroid. Whatever companies may tell you, the natural diet industry has not actually found a proven or effective alternative to these prescriptions, and in severe cases, it could be extremely detrimental for an individual to stop taking said prescriptions. However, unlike some of its thyroid based competitors, Biotest T2 has been discontinued at this time.