Horny Goat Weed (Epimedium spp.)

What is it?

Horny Goat Weed, also known as Epimedium, is a traditional Chinese medicinal herb used for centuries to enhance libido, improve erectile function, and boost overall vitality. It is also known by other names such as Yin Yang Huo or Barrenwort. The plant contains active compounds that support sexual health and improve energy levels.

How does it work for medicinal purposes?

Horny Goat Weed works by increasing blood flow and enhancing sexual function. The primary active compound, icariin, inhibits the enzyme phosphodiesterase type 5 (PDE5), similar to how certain medications for erectile dysfunction work. Additionally, it has antioxidant and anti-inflammatory properties, which contribute to overall health and vitality.

What are the active ingredients that are important for its medicinal properties?

The primary active ingredients in Horny Goat Weed include:

• Icariin: A flavonoid that enhances nitric oxide synthesis, improving blood flow and sexual function.
• Flavonoids: Provide antioxidant benefits.
• Polysaccharides: Support immune function and overall health.
• Sterols: Contribute to hormonal balance and health.

What forms does it come in?

• Dried leaves (for making tea)
• Capsules or tablets
• Powdered extract
• Tinctures and liquid extracts

What if I have an imbalance or deficiency?

Horny Goat Weed is primarily used to address issues related to sexual health, energy levels, and overall vitality. It is not typically used to address specific nutrient deficiencies, but it can support hormonal balance and improve symptoms related to low libido and erectile dysfunction.

When was it first used for medicinal purposes?

Horny Goat Weed has been used for medicinal purposes for over 2,000 years in traditional Chinese medicine. It has been traditionally employed to enhance sexual health, boost energy levels, and support overall well-being.

What does Horny Goat Weed (Epimedium spp.) help with?

Horny goat weed is a herb from Chinese medicine, known in Latin as Epimedium. Its best-studied plant compound is called icariin. It has long been used for low sex drive, tired limbs and weak bones.

• Bone loss after menopause
  Good evidence — clinical trials in women past menopause; sizes, doses and journals not recorded on file. The library holds clinical trials in women past menopause. In those trials, Epimedium helped hold or raise bone mineral density. The file does not record how many women took part, the dose, or where the trials were published.
  Evidence grade B · Traditional tier T2
• Hot flashes and other menopause symptoms
  Early evidence — some clinical trials in women past menopause, no sizes or doses on file. Some trials in women past menopause reported fewer hot flashes, less vaginal dryness and better mood. In lab studies, icariin acted a little like estrogen, without being a true hormone. Trial sizes and doses are not on file.
  Evidence grade C · Traditional tier T2
• Trouble getting or keeping an erection
  Early evidence — clinical research on file, with no trial sizes or doses recorded. Clinical research on file points to better erections, mostly in mild to moderate cases. In lab studies, icariin blocked PDE5, the same enzyme that the drug sildenafil blocks. No trial sizes, doses or journal names are on file.
  Evidence grade C · Traditional tier T2
• Low sex drive in men and women
  Early evidence — human studies on file plus long traditional use; no sizes or doses recorded. Studies on file point to better sex drive in both men and women. In lab work, icariin raised nitric oxide and supported testosterone activity. The file does not record how many people took part or what dose they took.
  Evidence grade C · Traditional tier T2
• Feeling tired and run down
  Long traditional use · not yet tested in trials — tradition and user reports only; no large human trial on file. In Chinese medicine, this herb is a classic tonic for what is called kidney yang weakness. That pattern covers deep tiredness, cold limbs and low drive. Users often report more energy, but the file holds no large trial for fatigue.
  Evidence grade insufficient · Traditional tier T2
• Low testosterone in men
  Long traditional use · not yet tested in trials — laboratory research only; no human trial on file. Lab research suggests icariin may act on the hormone signals that control testosterone. The idea is support for your own output, not a hormone being added. No human trial on file has measured testosterone levels in men.
  Evidence grade insufficient · Traditional tier T2
• Sore, stiff or swollen joints
  Long traditional use · not yet tested in trials — laboratory research and traditional use only. In lab research, icariin and related flavonoids lowered markers of swelling. Traditional use covered joint pain, and what we now call arthritis. The file holds no human trial for joint pain.
  Evidence grade insufficient · Traditional tier T2
• Memory and thinking as you age
  Long traditional use · not yet tested in trials — early lab research only; no human trial on file. Early research, done outside of people, suggests icariin may shield brain cells from oxidative stress. Some of this work touched memory pathways. The file holds no human trial on memory or aging of the brain.
  Evidence grade insufficient · Traditional tier T2
• Cold hands and feet, poor circulation
  Long traditional use · not yet tested in trials — laboratory mechanism work and traditional use only. Lab work suggests icariin raises nitric oxide, which helps blood vessels relax. This is the same mechanism studied for erections. Tradition used the herb for cold limbs, but no human trial on circulation is on file.
  Evidence grade insufficient · Traditional tier T2

What Horny Goat Weed (Epimedium spp.) has not been shown to do

• No human trial on file shows it lifts energy or eases long-term tiredness.
• No human trial on file shows it raises testosterone levels in men.
• The bone studies on file measured bone density only, not broken bones.
• It has not been shown to match or replace prescription erection drugs such as sildenafil.
• It has not been shown to work as hormone replacement therapy.

How to read this:

The grades rate the human evidence, not how strong the herb is. A means steady results across randomised trials in people. B means at least one good trial in people. C means small, mixed or early human studies. D means the human evidence is weak or clashing. Insufficient means no human study on file, only lab work, animal work or tradition. This page lists options and what studies found. It is not medical advice, and it does not cover dosing, drug interactions or who should avoid it. Talk with your own clinician before you start.

Which conditions and symptoms does it help prevent?

Horny Goat Weed can help prevent:

1. Sexual Dysfunction (Men)

• Maintains healthy erectile function, preventing erectile dysfunction.

1. Low Libido (Men and Women)

• Supports healthy sexual desire and function.

1. Menopausal Symptoms (Women)

• Helps balance hormone levels, preventing severe menopausal symptoms.

1. Bone Density Loss (Both)

• Supports bone health, preventing osteoporosis.

1. Chronic Fatigue (Both)

• Boosts energy and reduces fatigue, preventing chronic low energy.

1. Arthritis (Both)

• Anti-inflammatory properties help prevent joint pain and inflammation.

1. Cardiovascular Issues (Both)

• Enhances blood flow, preventing circulatory problems and supporting heart health.

1. Stress-Related Health Issues (Both)

• Reduces cortisol levels, preventing stress-related conditions.

1. Immune Deficiency (Both)

• Boosts immune function, preventing infections and immune-related conditions.

1. Cognitive Decline (Both)

• Antioxidant properties support brain health, preventing cognitive decline.

Which foods are rich in it?

Horny Goat Weed itself is not found in foods and is primarily consumed as an herbal supplement. However, maintaining a diet rich in nutrients that support overall health and vitality can complement the effects of Horny Goat Weed. Such foods include:

• Lean proteins (e.g., chicken, fish)
• Leafy greens (e.g., spinach, kale)
• Nuts and seeds
• Whole grains
• Fruits and vegetables

What are possible side effects?

Horny Goat Weed is generally safe for most people when used appropriately, but possible side effects include:

• Common (10-30%): Mild gastrointestinal issues (e.g., stomach upset, nausea)
• Less Common (1-10%): Dizziness; Dry mouth
• Rare (<1%): Rapid heartbeat; Severe allergic reactions

What’s the recommended daily dose?

The recommended daily dose of Horny Goat Weed varies depending on the form and individual health needs, but a common dose is:

• Capsules or tablets: 250-500 mg of standardized extract per day, containing at least 10% icariin
• Powdered extract: 1-2 grams per day
• Tincture: Follow the dosage instructions on the product label, typically 1-2 ml taken 1-2 times daily

How many days does it take to work?

Some benefits of Horny Goat Weed, such as improved energy levels and enhanced sexual function, can be noticeable within a few days to weeks. Long-term benefits, such as increased bone density and improved cardiovascular health, may take several weeks to months of regular use to become apparent.

What time of day is best to take it?

Horny Goat Weed can be taken at any time of day. It is often recommended to take it in the morning or early afternoon to avoid potential restlessness or insomnia at night due to its stimulant effects.

Is it best to take it with or without food?

Horny Goat Weed can be taken with or without food. Taking it with meals may help minimize any potential gastrointestinal discomfort. For optimal absorption and efficacy, follow the instructions provided on the product label.