The best replacement for free testosterone is total testosterone.

The best alternatives to free testosterone are rated as following:
★★★★★  total testosterone
★★★★  total
★★★  testosterone
★★  serum testosterone
★★  dht
★★  bound testosterone
★★  bound
★★  serum
★  bioavailable
★  total testosterone levels
  free androgen index

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Speaking about free testosterone, one probably shouldn't forget about normal total testosterone.

Other search terms related to free testosterone and their ratings are:
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