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  1. #1
    tice1212's Avatar
    tice1212 is offline Productive Member
    Join Date
    Feb 2014

    How much does T3 increase metabolism?

    I know this is a hard question to answer but I'm just wondering if someone's tdee is 3000 at normal thyroid production (25mcg)
    What percentage is the metabolism boosted if someone was to run 50mcg?
    15%? 30%? 50%?

  2. #2
    thewarrior8845 is offline Junior Member
    Join Date
    Jan 2011
    Im on thyroid replacement and I take 10 mcg t3 and 50 mcg t4. This is enough to bring on levels into optimal range. I really dislike taking the meds but I have to. If I dont get the calories in I flatten out quick. Im sure the boost in metabolism varies from person to person. Do you like t3?

  3. #3
    PT1982's Avatar
    PT1982 is offline Knowledgeable Member
    Join Date
    Feb 2017
    Home of the Braves
    It doesn't body metabolism in the sense you're thinking. It does burn fat (and muscle) through over stimulating the thyroid, but the metabolism boost is actually more of just a thermogenic feature of the t3 itself.

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