The best replacement for free t3 is total t3.

The best alternatives to free t3 are rated as following:
★★★★★  total t3
★★★  free t4
★★  t3 uptake
★★  t3
  reverse t3

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Speaking about free t3, one probably shouldn't forget about low free t4.

Other search terms related to free t3 and their ratings are:
★★★★★ low free t4
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