38TERA is a gut health supplement company founded by leading gastroenterologist and New York Times bestselling author Dr. Will Bulsiewicz. Every formula expertly combines cutting-edge microbiome science with Dr. Bulsiewicz’s clinical expertise to craft exceptional supplements. We build around premium ingredients proven by clinical trials and provide them in evidence-based amounts. We only use clean, carefully sourced ingredients, manufacture in FDA- and GMP-accredited facilities, and subject every batch to rigorous third-party testing — with results that are available for download. At 38TERA, we’re setting a new standard for gut health supplements by delivering superior formulations and unmatched commitments to safety, quality, and transparency.