I have read a few things about various supplements helping increase total testosterone, including boron, DHEA, horny goat weed, fenugreek, and arginine. If I were to google it, I'd find more. But I've never read that any affect Free-T levels. Some websites say to avoid fenugreek. Who knows...I haven't found any sort of doctor who even wants to speak about supplements vs. testosterone, they just shove me out the office door when it comes up in conversation. Good luck to all of us with this....