The best replacement for t-3 is t-4.

The best alternatives to t-3 are rated as following:
★★★★★  t-4
★★  cytomel t-4
★  ds 3
★  t-7
  t-1

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No companions for t-3 have been suggested so far.
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Google Trends

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t-3
t-4
cytomel t-4