# Icariin (3-O-alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranoside)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/icariin-beta-d-glucopyranoside
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-28
**Evidence Score:** 4 / 10
**Category:** Compound
**Also Known As:** Horny goat weed extract, Epimedium flavonoid, Yin Yang Huo extract, Barrenwort extract, ICA, Epimedium glycoside, 3-O-rhamnosylicariside, Icariside II precursor, YinYangHuo active compound

## Overview

Icariin is a prenylated flavonoid glycoside extracted from Epimedium species that acts as a phosphodiesterase-5 (PDE5) inhibitor. This compound modulates nitric oxide pathways through enhanced endothelial nitric oxide synthase (eNOS) activity, primarily supporting vascular and reproductive health.

## Health Benefits

• May support erectile function by modulating eNOS activity (preclinical evidence only)
• Shows potential for kidney protection in diabetic nephropathy models, reducing creatinine and blood urea nitrogen (animal studies only)
• May enhance [testosterone production](/ingredients/condition/hormonal) and sperm counts at 50-100 mg/kg doses (rat studies, no human trials)
• Demonstrated [bone mineral density](/ingredients/condition/bone-health) improvements in osteoporosis patients as part of Epimedium Total Flavonoid Capsule (limited human data)
• Exhibits antioxidant properties by increasing SOD/GPX and reducing [lipid peroxidation](/ingredients/condition/antioxidant) at moderate doses (animal models)

## Mechanism of Action

Icariin functions as a phosphodiesterase-5 (PDE5) inhibitor, increasing cyclic guanosine monophosphate (cGMP) levels and promoting nitric oxide-mediated vasodilation. The compound enhances endothelial nitric oxide synthase (eNOS) activity while modulating calcium channels and protein kinase pathways. Additionally, icariin demonstrates antioxidant properties by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) and activating nuclear factor erythroid 2-related factor 2 (Nrf2) pathways.

## Clinical Summary

Current evidence for icariin is limited to preclinical animal studies and in vitro research, with no published human clinical trials available. Animal studies using 50-100 mg/kg doses showed improved erectile function markers and increased [testosterone levels](/ingredients/condition/hormonal) in rodent models. Diabetic nephropathy studies in rats demonstrated reduced creatinine and blood urea nitrogen levels with icariin supplementation. Human efficacy, optimal dosing, and safety profiles remain unestablished due to the absence of clinical trial data.

## Nutritional Profile

{"macronutrients": {"protein": "Not applicable", "carbohydrates": "Not applicable", "fats": "Not applicable", "fiber": "Not applicable"}, "micronutrients": {"vitamins": "Not applicable", "minerals": "Not applicable"}, "bioactive_compounds": {"icariin": "Concentration not specified; icariin is the primary bioactive compound in the compound", "bioavailability": "Icariin has low oral bioavailability due to poor absorption and rapid [metabolism](/ingredients/condition/weight-management); often modified or combined with other compounds to enhance absorption"}}

## Dosage & Preparation

Human dosing data is sparse; one phase 1 trial tested oral icariin in escalating doses (specific amounts not detailed). Animal studies used 20-150 mg/kg/day for diabetic nephropathy and 50-200 mg/kg for reproductive effects, with optimal results at 50-100 mg/kg. No standardized human equivalent doses have been established. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Safety data for icariin in humans is extremely limited due to lack of clinical trials. Theoretical concerns include potential interactions with PDE5 inhibitor medications (sildenafil, tadalafil) due to similar mechanisms of action. Animal studies suggest possible mild gastrointestinal effects at high doses, though specific adverse events are poorly documented. Pregnancy and breastfeeding safety is unknown, and individuals with [cardiovascular](/ingredients/condition/heart-health) conditions should exercise caution due to the compound's vasodilatory effects.

## Scientific Research

Human clinical evidence for icariin alone is extremely limited, with only one phase 1 safety and pharmacokinetics trial (N=24 healthy adults) examining tolerability and [cognitive](/ingredients/condition/cognitive) effects over 24 hours. A 2021 protocol for a systematic review of RCTs on icariin for knee osteoarthritis was registered but no completed results are available. Most evidence comes from preclinical animal studies on diabetic nephropathy, reproductive function, and [oxidative stress](/ingredients/condition/antioxidant).

## Historical & Cultural Context

Icariin from Epimedium species (horny goat weed) has been used in Traditional Chinese Medicine for many years, particularly for treating erectile dysfunction. It is also incorporated into formulations like Epimedium Total Flavonoid Capsule for [osteoporosis](/ingredients/condition/bone-health) symptom relief.

## Synergistic Combinations

L-arginine, Panax ginseng, Tribulus terrestris, Zinc, Maca root

## Frequently Asked Questions

### What is the effective dosage of icariin for erectile dysfunction?

No established human dosage exists for icariin as clinical trials have not been conducted. Animal studies used 50-100 mg/kg doses, but this cannot be directly translated to human recommendations without proper safety and efficacy studies.

### Can icariin be taken with Viagra or other ED medications?

Icariin should not be combined with PDE5 inhibitors like sildenafil (Viagra) or tadalafil (Cialis) due to similar mechanisms of action. This combination could potentially cause dangerous drops in blood pressure and requires medical supervision.

### How long does icariin take to work for testosterone benefits?

Animal studies showed testosterone increases within 2-4 weeks of supplementation, but human timeframes are unknown. Individual responses may vary significantly, and testosterone effects in humans remain unproven without clinical trial data.

### What is the difference between icariin and horny goat weed extract?

Icariin is the primary active compound within horny goat weed (Epimedium) extract, typically comprising 10-60% of standardized extracts. Pure icariin provides more concentrated and consistent dosing compared to whole plant extracts with variable icariin content.

### Does icariin help with kidney disease in diabetes?

Animal studies suggest icariin may reduce kidney damage markers like creatinine and blood urea nitrogen in diabetic nephropathy models. However, no human studies exist, and individuals with kidney disease should consult healthcare providers before use.

### Is icariin safe to take during pregnancy or while breastfeeding?

There is insufficient clinical evidence regarding icariin safety in pregnancy or lactation, and animal studies have not specifically evaluated reproductive toxicity at typical supplement doses. Due to icariin's potential effects on hormone levels and vascular function, pregnant or breastfeeding women should consult a healthcare provider before use. No human safety data exists to establish safe dosing in these populations.

### Does icariin interact with blood pressure medications or anticoagulants?

Icariin may interact with blood pressure medications and anticoagulants due to its potential effects on nitric oxide pathways and vascular function, though clinical interaction studies are lacking. Individuals taking antihypertensive drugs (ACE inhibitors, beta-blockers) or blood thinners (warfarin, aspirin) should consult their healthcare provider before adding icariin supplementation. No systematic drug interaction trials have been conducted in humans.

### How strong is the clinical evidence for icariin's health benefits in humans?

Most evidence for icariin comes from animal and laboratory studies; human clinical trials remain extremely limited or absent for all claimed benefits including erectile function, testosterone, and bone health. The few small human studies that exist are preliminary and often lack rigorous methodology such as double-blinding or adequate control groups. Current evidence is insufficient to definitively establish efficacy or optimal dosing in humans, and more well-designed clinical research is needed.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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