Hermetica Superfood Encyclopedia
The Short Answer
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.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelModerate
Primary Keywordicariin benefits
Synergy Pairings5
Icariin (3-O-alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranoside) — botanical close-up
Health Benefits
Origin & History
Natural habitat
Icariin is a flavonoid glycoside (3-O-alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranoside) primarily extracted from Epimedium species, commonly known as horny goat weed. It is obtained through solvent extraction or purification from the aerial parts of the plant and belongs to the chemical class of prenylated flavonoids.
“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 symptom relief.”Traditional Medicine
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 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.
Preparation & Dosage
Traditional 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.
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; often modified or combined with other compounds to enhance absorption"}}
How It Works
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 and activating nuclear factor erythroid 2-related factor 2 (Nrf2) pathways.
Clinical Evidence
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 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.
Safety & 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 conditions should exercise caution due to the compound's vasodilatory effects.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Horny goat weed extractEpimedium flavonoidYin Yang Huo extractBarrenwort extractICAEpimedium glycoside3-O-rhamnosylicarisideIcariside II precursorYinYangHuo active compound
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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