Nettle Root for Free Testosterone Increase
The SHBG-binding hypothesis is popular but has not been demonstrated to raise free testosterone in humans.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- Studied at 120-600 mg/day of nettle root extract for prostate symptoms; free testosterone did not increase in these trials
- Expected timeframe
- Not established
Protocol
- form
- Not applicable
- duration
- Not applicable
- co factor
- Evidence is insufficient. The claim rests on in vitro work showing nettle root lignans, particularly (-)-3,4-divanillyltetrahydrofuran, bind sex hormone binding globulin and could in principle displace testosterone, increasing the free fraction. That binding is real in a test tube. What has not happened is demonstration in people: human trials of nettle root at 120-600 mg/day, conducted for benign prostatic hyperplasia and lasting up to a year, measured urinary symptoms rather than androgens, and where hormones were assessed, free testosterone, total testosterone and SHBG did not change meaningfully. There is no randomised trial in men showing nettle root raises free testosterone, and the in vitro binding affinity is likely too weak at achievable plasma concentrations.
- titration
- Not applicable
- starting dose
- Not established as a testosterone intervention
Evidence
What the studies say
No studies are yet linked to both Nettle Root and Free Testosterone Increase.
Safety
Caveats
If you suspect low testosterone, get it measured properly - a morning total testosterone on two separate occasions, with SHBG, LH, FSH and prolactin - rather than self-treating. Genuine hypogonadism has causes worth identifying, including pituitary disease, haemochromatosis, obesity, obstructive sleep apnoea, opioid use and anabolic steroid history, and it is treated with prescribed testosterone under monitoring. Symptoms attributed to low testosterone - fatigue, low mood, low libido - are more often caused by poor sleep, depression, alcohol, obesity or thyroid disease. Weight loss, resistance training, sleep and treating sleep apnoea have better evidence than any supplement. Safety of nettle root: generally well tolerated, with mild gastrointestinal upset, and occasional allergic skin reactions the commonest effects. There is no established upper intake level and long-term safety beyond a year is not well characterised. Nettle has diuretic activity, so use caution with diuretics, lithium - where reduced clearance can cause toxicity - and in kidney disease. It may lower blood glucose and blood pressure, relevant if you take diabetes or antihypertensive medication, and may interact with anticoagulants given vitamin K content in leaf preparations. Avoid in pregnancy, where uterine stimulant activity has been reported, and in breastfeeding.
Less likely to help if
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.