Boron may increase free testosterone temporarily in some men, but current evidence does not show that it reliably increases total testosterone or treats low testosterone. The positive evidence comes mainly from one small, short-term study. A separate randomized trial found no testosterone benefit. Boron is not a proven testosterone booster.
Boron and Testosterone: At a Glance
| Question | Evidence-based answer |
|---|---|
| Can boron increase testosterone? | It may increase free testosterone for a short period. |
| Does boron reliably increase total testosterone? | No convincing evidence shows that it does. |
| Does boron treat testosterone deficiency? | No. |
| Strongest positive evidence | One study involving 8 healthy men for 7 days. |
| Strongest negative evidence | A 7-week randomized trial involving 19 male bodybuilders. |
| Is boron essential for humans? | No clear essential function has been established. |
| Adult tolerable upper intake level | 20 mg per day from food, drinks and supplements combined. |
What Did the Positive Boron Study Find?
A 2011 study gave 10 mg of boron daily for one week to eight healthy male volunteers. After seven days, the researchers reported an increase in mean free testosterone. They also reported lower estradiol and changes in sex hormone-binding globulin, or SHBG. Dihydrotestosterone, cortisol and vitamin D increased as well.
That result is worth noting, but it does not establish boron as an effective testosterone supplement. The study:
- Included only eight men
- Lasted just seven days
- Measured hormone changes, not symptoms, muscle gain, fertility or sexual function
- Did not show whether the changes continued after the study ended
- Did not prove that boron increased testosterone production by the testes
The result also involved free testosterone, not necessarily a meaningful increase in total testosterone. Free and total testosterone are related, but they are not interchangeable measures when assessing testosterone deficiency.
What Did the Negative Study Find?
A 1993 randomized controlled trial studied 19 male bodybuilders aged 20 to 27. Ten participants took 2.5 mg of boron daily, while nine took a placebo for seven weeks.
Boron produced no significant effect on total testosterone, free testosterone, lean body mass or strength. Both groups improved during the bodybuilding program. That suggests the exercise program, rather than boron, explained the increases in testosterone and performance.
This study does not show that boron can never affect testosterone. It does show that boron did not consistently raise testosterone in these healthy men.
Why Might Boron Change Free Testosterone?
Boron may affect SHBG, the protein that binds testosterone in the bloodstream. A change in SHBG can alter the proportion of testosterone measured as free testosterone without causing a similar rise in total testosterone.
That distinction matters. A short-term change in a blood measurement does not show that boron corrects testosterone deficiency or improves libido, energy, fertility or muscle growth. The American Urological Association states that total and free testosterone should not be treated as interchangeable diagnostic measures.
Is Boron Worth Taking as a Testosterone Booster?
No, not specifically to raise testosterone. The evidence is too small, inconsistent and short-term to support buying boron as a dependable testosterone supplement.
Boron occurs naturally in foods such as fruits, vegetables, nuts, beans and other plant foods. The National Institutes of Health states that boron is not classified as an essential human nutrient and that no recommended intake has been established.
Boron Is Not a Substitute for
- Medical testing for suspected low testosterone
- Adequate sleep and sufficient calorie and protein intake
- Resistance training and a healthy body composition
- Treatment for obesity, sleep apnea, thyroid disease or other conditions that can affect testosterone
- Clinician-prescribed testosterone therapy when genuine hypogonadism is diagnosed
How Much Boron Is Safe?
The adult tolerable upper intake level for boron is 20 mg per day from all sources, including food, drinks and supplements. This is not a recommended testosterone-boosting dose. It is a safety threshold based largely on reproductive and developmental effects observed in animal research.
Do not use household borax or boric acid as supplements. These substances can cause poisoning, including vomiting, diarrhea, skin symptoms, kidney injury, seizures and, at extremely high exposures, death.
What Should You Do If You Suspect Low Testosterone?
Arrange a medical evaluation rather than relying on boron or a single testosterone test. The Endocrine Society recommends assessing compatible symptoms alongside consistently low testosterone results and confirming low levels with repeat morning testing.
Boron is therefore an unproven option for raising testosterone. If low testosterone is a concern, testing and evaluation are more useful than adding a supplement with limited and conflicting evidence.