Nature-Throid™ is a natural, hypoallergenic alternative to synthetic thyroid medications. Most synthetic thyroid drugs often contain only T4 hormone. Nature-Throid™ contains two thyroid hormones, T4 and T3 to stimulate your body’s natural processes and is available in 13 strengths. Discover the Nature-Throid™ difference! RLC Labs also manufactures a-Drenal, a comprehensive adrenal support formula and i-Throid™, (iodine 12.5 mg and 6.25 mg) which can be used alone or in conjunction with Nature-Throid™ for lasting symptom relief.