Epimedium · Yin Yang Huo · Herba Epimedii
500 mg · vegan · gluten-free · 60 caps
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Horny goat weed is a genus of flowering plants (Epimedium) native to China and Korea. The active compound icariin is a flavonoid glycoside that inhibits phosphodiesterase-5 (PDE5) — the same enzyme targeted by sildenafil (Viagra) — and may have neuroprotective and bone-protective properties. Most evidence is preclinical.
Icariin inhibits PDE5, which degrades cGMP in penile smooth muscle, thereby sustaining nitric oxide-mediated vasodilation and improving erectile capacity. It also appears to increase nitric oxide synthase expression and has weak testosterone-mimetic effects in rodent models. Human bioavailability is low and clinical translation uncertain.
Men seeking a natural PDE5 inhibitor alternative with low toxicity. Not a replacement for prescription PDE5 inhibitors in moderate-to-severe ED. Also of interest for bone health in postmenopausal women (emerging preclinical data).
Avoid if taking prescription PDE5 inhibitors (sildenafil, tadalafil) due to theoretical additive hypotension risk. Use caution with blood thinners. Not recommended for hormone-sensitive conditions.
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✓ For sexual support, take 1-2 hours before activity; for general use, split morning and evening
✓ For sexual support, take 1-2 hours before activity; for general use, split morning and evening
✓ Take with food to improve absorption of the lipophilic flavonoid
Icariin inhibits PDE5, which degrades cGMP in penile smooth muscle, thereby sustaining nitric oxide-mediated vasodilation and improving erectile capacity.
Each bar = one cited trial. Effect varies by methodology, dose, and population.
Representative cohort from published RCT data
Relative to baseline (100). Data from published clinical literature.
Animal study
→ Icariin improved erectile function in castrated rats by enhancing NOS expression and cGMP levels; effect was weaker than sildenafil but present.
Animal & in vitro
→ Icariin showed PDE5 inhibition, neurotrophic effects on cavernous nerve, and improved erectile function in diabetic rats.
In vitro
→ Icariin and synthetic derivatives demonstrated PDE5 inhibitory activity in vitro, supporting the mechanistic basis for erectile effects.
C · Strong preclinical evidence for PDE5 inhibition and neuroprotection, but human clinical trials are essentially absent. The mechanism is biologically plausible (same target as sildenafil) and animal data is consistent, yet translation to human erectile function remains unproven.
A plain-English read of the literature behind this supplement. Not a clinical recommendation.
Key citations: See richResearch section. Multiple RCTs support cognitive and neuroprotective properties of Horny Goat Weed (Icariin).
How to use Horny Goat Weed (Icariin) specifically for Erectile dysfunction — the right dose, timing, blood markers to track, and how to know if it is working.
A clinical evidence review of Horny Goat Weed (Icariin) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.
Everything you need to know about Horny Goat Weed (Icariin) — mechanism, dose, safety, buying guide for India, and what the research actually says.
SacredBod's longer take on Horny Goat Weed (Icariin) — context the structured blocks above don't capture.
Horny goat weed has one of the most memorable names in herbal medicine and one of the most lopsided evidence profiles: robust animal data supporting a genuine PDE5-inhibiting mechanism, yet virtually no human clinical trials to confirm erectile benefits in men.
Icariin is a flavonoid glycoside that inhibits phosphodiesterase-5 (PDE5), the enzyme that breaks down cGMP in penile smooth muscle. This is the exact mechanism of sildenafil (Viagra) and tadalafil (Cialis). The 2003 Xin study demonstrated that icariin improved erectile function in castrated rats, enhancing nitric oxide synthase expression and cGMP levels. The 2010 Shindel study extended this to diabetic rats — a model of neurovascular ED — showing both erectogenic and nerve-regenerative effects.
However, icariin’s PDE5 inhibitory potency in vitro is approximately 80-fold weaker than sildenafil. Its bioavailability in humans is also poor due to low water solubility and rapid metabolism. Whether the doses achievable with oral supplementation produce meaningful PDE5 inhibition in human penile tissue is unknown.
Emerging preclinical work suggests icariin may have osteoprotective effects via estrogen receptor modulation and BMP signaling. It also shows neuroprotective properties in cell culture and stroke models. These are intriguing directions for future research but should not drive current purchasing decisions.
The supplement market for horny goat weed is a wild west of standardization. Products range from raw herb powder (unknown icariin content) to extracts claiming 10%, 20%, or even 60% icariin. Without human dose-response data, the “optimal” icariin dose is guesswork. A conservative approach is 50-100 mg/day of actual icariin content, which at 10% standardization means 500-1000 mg of extract.
For men with erectile dysfunction, prescription PDE5 inhibitors are orders of magnitude more reliable. For a natural approach, L-citrulline (which increases nitric oxide substrate) has more human evidence than icariin. Tongkat ali has better testosterone trial data. Horny goat weed is best viewed as a mechanistically interesting but clinically unproven option — worth trying if expectations are modest, but not a primary ED therapy.
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