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l carnitine and thyroid L-carnitine supplementation at doses of 2–4 g/day has been shown in a randomized, double-blind, placebo-controlled trial by Salvatore Benvenga to reverse prevent symptoms of iatrogenic hyperthyroidism in women receiving TSH-suppressive levothyroxine MaryRuth's Liquid Morning Multivitamin Weekend Special Sale GlyNACtive™ — Price:Retail

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doi: 10.1021/tx034157r