Thyroid Genes & Biomarkers — Summary Table Gene / Biomarker Bad Score / Variant Free Actions Supplement / Equipment GENES TPO rs2268458 A allele Selenium diet; manage stress Selenium 200 mcg/day DIO2 rs225014 T/T genotype Optimize zinc & selenium intake Liothyronine (T3) TSHR rs179247 risk allele Avoid excess iodine Dose review with MD BIOMARKERS TSH > 4.5 mIU/L Sleep hygiene; limit stress Levothyroxine (T4) Free T4 < 0.8 ng/dL Iodine-rich foods (seaweed, fish) T4 dose titration Free T3 < 2.3 pg/mL Iron, zinc, selenium diet T3 or NDT therapy Anti-TPO Ab > 35 IU/mL Gluten-free / AIP protocol Selenium + LDN