Eumyanggwak
Quick Facts
- What it is: Eumyanggwak is the dried leaf of Epimedium koreanum, a Korean herb also sold as horny goat weed.
- Main uses: Low sex drive and erection trouble, Bone thinning after menopause, Tiredness with weak, sore knees, Joint aches
- Best for: People who want to know what tradition says about it, Short, watched trials under a trained practitioner
- Active ingredients: Icariin, Icariside I and II, Epimedins A, B and C, Plant sterols, Polysaccharides (plant sugars)
- Forms: Dried leaf for tea, Powder, Capsules and tablets, Tincture or herbal wine, Part of a mixed formula
- Time to effect: Not known; tradition assumes weeks, and there is no trial to confirm it.
- Side effects: Dry mouth, fast heartbeat and poor sleep are common complaints; rare reports link it to liver harm.
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What is Eumyanggwak?
Eumyanggwak is a dried herb used in Korean medicine. It is the leaf of the plant Epimedium koreanum. In English it is sold as Korean epimedium, or horny goat weed.
It is a single herb, not a blend. Korean and Chinese texts group it with herbs for low sex drive, weak knees and sore joints. Most shops today sell it in pills and powders aimed at energy, sex drive and bone health.
The honest verdict on proof is short. Lab and animal work looks busy, but good human trials on this plant are very few. A long past of use is not proof that a herb works, and that gap matters here.
This herb is not a mild food-type plant. Reports link products made from Epimedium to liver harm, a fast heartbeat and more bleeding. Read the safety part below before you try it.
How does Eumyanggwak work?
No one can say for sure how it works in people. The lab story is clearer than the human one.
The main plant chemical is icariin. In test tubes and in rats, icariin blocks an enzyme called PDE5 (a body chemical that controls blood flow in the penis). That is the same target that the drug Viagra hits, but the plant is far weaker and far less exact.
Icariin also acts a little like estrogen (a female sex hormone) in lab cells. Animal work suggests it may slow bone loss and may help blood vessels relax. None of this has been shown to hold true in good human trials.
Treat the above as a lead, not a fact. A plant that works in a dish often does nothing in a person.
What forms does Eumyanggwak come in?
You may meet it in these forms:
Dried sliced leaf, boiled into a strong tea (a decoction).
Raw powder, loose or packed into capsules.
Extract capsules and tablets, often labelled by icariin percent.
Tinctures and herbal wines, where the leaf is soaked in alcohol.
Leaf fried in lamb fat, a classic Korean and Chinese prep step.
As one herb inside a larger formula written by a trained practitioner.
Where it comes from:
The herb has a long past across East Asia. Chinese texts list it as yin yang huo, going back to the Shennong Bencao Jing, an early herb classic.
In Korea it appears as eumyanggwak in the Donguibogam, the great Korean medical work of 1613. Japanese Kampo uses it too.
Old texts place it in the group of herbs said to warm the kidney and lift yang energy. Those are tradition terms, not lab findings.
Who should avoid Eumyanggwak?
- Do not use if you are pregnant, breastfeeding or trying for a baby.
- Do not use if you have any liver disease (an illness that harms the liver), or if past liver tests came back high.
- Do not use if you take warfarin or any other blood thinner.
- Do not use if you take aspirin or clopidogrel to stop clots.
- Do not use if you take sildenafil (Viagra), tadalafil (Cialis), or nitrates for chest pain.
- Do not use if you have a heart rhythm problem (a heartbeat that is too fast or uneven).
- Do not use if you have high or low blood pressure that is not under control.
- Do not use if you have, or have had, a hormone-driven cancer such as breast, ovarian or womb cancer.
- Do not use if you take estrogen, the contraceptive pill, or tamoxifen.
- Do not use if you take drugs that are hard on the liver, such as methotrexate or a statin.
- Do not use if you have surgery or dental surgery booked in the next two weeks.
- Do not use if you are under 18 years old.
- Do not use if you cannot check with your doctor first while on any prescription drug.
When should you see a doctor?
Stop the herb and get medical help the same day if your skin or the whites of your eyes turn yellow, your urine goes dark, or you have pain under your right ribs. These can be signs of liver harm.
Call emergency services for chest pain, fainting, a racing heartbeat that will not settle, bleeding you cannot stop, or swelling of the face, lips or throat. An erection lasting more than four hours is also an emergency.
Book a normal appointment if you get a rash, ongoing dizziness, changes in your periods, or new breast tenderness. Also see your doctor rather than self-treating if erection trouble, deep tiredness or bone pain is new, since these can point to a problem worth finding early.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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