Calcium fructoborate

Tier 2 — promising · Bone · Joint · Testosterone

A naturally occurring plant-sourced compound that delivers boron complexed with fructose. Multiple trials show it significantly reduces joint pain and inflammation markers in knee osteoarthritis. Also shown to modestly raise free testosterone and DHEA in men. Better absorbed and more bioavailable than inorganic boron forms. Delivers around 3 to 6 mg boron per studied dose.

Dose: 110–220 mg/day calcium fructoborate (providing ~3–6 mg boron); better absorbed than boron glycinate