Nutrition
T4 to T3 Conversion Basics
T4 to T3 conversion turns stored thyroxine into active hormone in tissues—food minerals and recovery support it; illness and deficit can slow it temporarily.
T4 to T3 conversion basics: most circulating T4 becomes active T3 in liver, muscle, and other tissues via selenium-dependent enzymes—levothyroxine supplies T4, not finished T3. Illness, low calories, and heavy training can slow conversion temporarily.
Adequate selenium and iodine from food support the pathway; megadoses do not shortcut fatigue. Some people on T4 alone still feel flat until clinicians adjust therapy—never add T3 without medical oversight.
Common questions
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Can you boost conversion with supplements alone?
Fix adequacy from food first and remove extreme deficits or overreaching. Supplement stacks without labs and clinician guidance can worsen thyroid balance.
Related terms
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