Comparison guide

Which boron should you take?

All three deliver the same element, and at their usual doses they supply about 3 mg of boron a day. The evidence for boron itself is limited, a few small metabolic-ward studies and no trials on bone, arthritis or testosterone outcomes, and no chelated or complexed form has been shown to work better.

The options, compared

Option	Evidence	Best for	The honest note
Boron	Limited evidence	Anyone set on trying boron	The human studies used 3 mg/day as sodium borate; testosterone products at 6–10 mg/day exceed anything tested for long-term safety. Boron has no RDA and no known deficiency disease.	View
Boron Glycinate	Limited evidence	Not worth a premium	Sold as a chelated form, but it has not been shown to work differently from other boron salts. The hormone claims trace back to one study of 12 boron-depleted women.	View
Calcium Fructoborate	Limited evidence	Knee discomfort, at most	Two small trials from the ingredient's developers reported knee pain relief at 110 mg twice daily, about 3 mg of boron; nobody has independently replicated them.	View

Our verdict

If you want to try boron, any form at about 3 mg a day is effectively equivalent, and there is little reason to go higher. Do not pay extra for glycinate or fructoborate on absorption claims. Skip boron entirely if you are pregnant, a man trying to conceive, have kidney impairment or have a hormone-sensitive condition.