howtosupplement
Mobility/Inflammation

Boron

Trace mineral from prunes, avocado, and nuts that may modestly ease knee osteoarthritis symptoms and lower some inflammatory markers.

Boron

Boron

48
score
C
evidence
Safe
risk

Proven Benefits

01Improves knee OA pain/function
02May lower inflammatory markers
03May support bone density

Chemical Forms

Recommended
  • Calcium fructoborate
  • Boron glycinate
  • Boron citrate
Avoid
  • Borax / sodium borate (not a nutritional supplement)
  • Boric acid (not a standard oral nutrition form)
Expert Note

Calcium fructoborate has the most direct human data for joint symptoms and inflammatory markers. Glycinate and citrate are common delivery forms that simply supply elemental boron; they have not been shown to outperform calcium fructoborate for outcomes. Borax and boric acid are not appropriate oral nutrition forms.

Protocol

Amount
3-6 mg
Frequency
Once daily
When
With food; consistency matters more than timing.

Condition-Based Dosing

Adults trying boron for knee OA symptoms
3-6 mg/day of elemental boron for 4-8 weeks
Postmenopausal adults focused on bone health
3 mg/day with adequate calcium, magnesium, and vitamin D
Healthy adults without joint symptoms
No routine supplement needed; prioritize boron-rich foods

Safety & Limits

Upper Safe Limit
20 mg/day (IOM UL for adults)
Cycling
Safe for continuous use

Contraindications

Severe kidney disease — reduced excretion may increase boron accumulation
Pregnancy or breastfeeding — avoid supplemental doses above usual dietary intake unless clinician-guided
Hormone-sensitive conditions or hormone therapy — limited human data suggest boron can alter estrogen or testosterone levels

Synergies

Vitamin D3

Boron may influence vitamin D activity and calcium handling, so adequate vitamin D status may strengthen any bone or joint-related effect.

Magnesium

Boron appears to reduce urinary magnesium loss and interacts with mineral balance, so low magnesium status may blunt any benefit.

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