T4 links: Thyroid Hormones reference: 4-11-2021 T4 (Thyroxine) # T3 and T4 can be inhibited by many processes, so “free t3” or “free t4” doesn’t say much. (4/12 I got 1.30) Hans says 1.3-1.4 is ideal. Backlinks Acetylcholine Deiodinase Selenium TSH Thyroglobulin Thyroid Supplementation Thyroxine-Binding Globulin Interactive Graph