Educational information, not medical advice — ask your doctor or midwife.
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Mokjeok is the dried stem of a plant called Equisetum hyemale. In English it is called scouring rush or horsetail. Korean medicine uses it as a single drug, which means it is given on its own rather than mixed into a formula.
Healers have used it to soothe sore, red eyes, to cool what old texts called heat, and to check light bleeding. Modern sellers also push horsetail for puffiness from extra body water, and for hair, nails and bones.
The proof is thin. We could find no human trial on Mokjeok itself. Long use shows that people trusted the herb for centuries, but it does not prove the herb works, and that gap is the honest starting point for this page.
No one has shown how Mokjeok acts in the body. The ideas below are untested guesses drawn from lab work and from the related field horsetail.
The stems hold a lot of silica, a hard mineral much like sand. That is why the plant was once used to scrub pots, and it may be why the herb feels gritty and drying.
Animal work suggests horsetail can make the kidneys pass more water. The stems also hold tannins, plant compounds that pull tissue tight, which could explain the old use on weepy eyes and small bleeds. None of this has been confirmed in people.
You will most often see cut, dried stems sold loose for a decoction, which is a tea made by simmering the herb in water.
Other forms include powder, capsules, tinctures (alcohol drops) and eye or skin washes made from the cooled tea.
Check the label. Many products sold as horsetail use a different species, Equisetum arvense (field horsetail), not the Mokjeok plant.
Mokjeok appears in classic East Asian herb books, where it is written as mu zei in Chinese. Korean texts, including the 17th-century Donguibogam, list it for eye complaints and light bleeding.
It has stayed a modest but steady part of Korean herbal practice ever since, usually in small amounts and for short courses.
Stop taking it and see a doctor if you get muscle cramps, weakness, a pounding or uneven heartbeat, or you feel faint. These can be signs that your potassium has dropped too low.
Get medical help the same day for tingling or numbness in your hands or feet, confusion, or new trouble walking. These can be signs of a vitamin B1 shortage.
See a doctor rather than treating yourself if you have bleeding you cannot explain, eye pain or changed vision, blood in your urine, or burning urine with fever or back pain. Also check in if swelling in your legs or face keeps coming back.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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