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Si Miao Pian
An All Natural Chinese Herbal Supplement
Si Miao Pian (Si Miao Wan, Dampclear™, Si Miao San, 四妙片) is a classic Chinese herbal remedy that clears away Heat and eliminates Dampness. This formula is used for the Damp-Heat TCM syndrome that includes weakness of the knees and leg along with red, painful swelling, and scanty urination with darkish urine.
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    What does it do?

    Relieves Aches, Swelling & Weakness in the Legs

    Think what it would be like to be able to go for brisk walks again, free of discomfort. Or go up and down a flight of stairs with vigor. Think what it would be like just to go get the mail without the experience feeling like a trek up Mt. Everest. And think what a relief it would be going to the bathroom and having a strong urination without stopping and starting in fits.

    Many people believe living with body aches, swelling and weakness is just a part of the normal aging process. But if you have joint discomfort and your achy, lower extremities prevent you from living life to the fullest, our classic formula, DampClear™ may help.

    Ancient TCM Formula Clears away Heat and Removes Dampness

    DampClear is an herbal traditional Chinese medicine (TCM) remedy. Chinese medicine doctors have historically dispensed this formula (known as Si Miao San in TCM) to regulate blood flow in the lower extremities; metabolize fluids; and manage aches, numbness and joint swelling.

    Although Damp-Heat theory dates back several centuries, it applies more than ever to modern lifestyles. One major reason Damp-Heat develops is diet. Too much sugar, greasy and fatty foods (and sometimes spicy food, depending on your constitution) can lead to internal Damp-Heat.

    When Damp-Heat accumulates in the body, according to TCM theory, it particularly affects the sensitive, hollow spaces, i.e. the joints. That's because Damp-Heat impedes the flow of Qi. Think about when you're on a cross-country or international flight. Your joints get stiff and achy from sitting for so long. Your circulation and life energy force--Qi--is impeded. (Just as you feel stiff in the lower body from flying, Damp-Heat first affects the lower extremities.) The result of this can manifest as swelling or redness around the feet, ankles or knees.

    Dampness is the pathogenic factor that obstructs harmonious Qi flow and causes stiff joints and heavy limbs. As for Heat, it dries up the fluids and injures Yin. When fluids dry, it causes a vicious cycle, leading to more Dampness.

    How Does DampClear Work?

    The first herb in the formula, Huang Bo (Amur Cork Tree Bark) purges fire and resolves toxicity. Cang Zhu (Atractylodes Rhizome) dries dampness and strengthens the Spleen.

    Next in the formula is Niu Xi (Achyranthes Root), which tonifies the Liver and Kidneys, and dispels stasis and unblocks the Channels. Yi Yi Ren (Coix Seed) clears heat and strengthens the Spleen and leaches out dampness.

    These four herbs work synergistically to help regulate the swelling process and promote problem-free urination, among other benefits. There's good reason that the classic formula for this is known as "four marvels pill."

    Does Research Support DampClear?

    Today in China a common application of the Dampclear formula is gout as the display of gout in many cases fits the description of damp heat in TCM. Many clinical studies have been conducted to evaluate the usefulness of the Si Miao San formula for gouty arthritis with positive outcomes.1-3. In an analysis of 24 such studies, it was found that it significantly lowered serum uric acid, an indicator of gout (p < 0.00001), ESR (erythrocyte sedimentation rate) (p < 0.00001), and CRP (C-Reactive Protein) (p = 0.03). Apparently, the result of Si Miao decoctions in the treatment of gouty arthritis is mediated by its anti-inflammation and urate reduction effect.2

    What is the formula composition?

    A proprietary blend of

    Cortex Phellodendri Chinensis
    Rhizoma Atractylodis Lanceae
    Radix Achyranthis Bidentatae
    Semen Coicis Lachryma-Jobi
    (Huang Bo)
    (Cang Zhu)
    (Niu Xi)
    (Yi Yi Ren)
    What is Available?
    Guang Ci Tang® Si Miao Pian (Dampclear™) 40 grams in 200 mg 200 tablets @ 5:1 strength.

    At a true 5:1 concentration, this product represents the most potent form of Si Miao Pian (San/Wan) on the market. One tablet is equal to 1 gram of raw herb.

    Please note that Guang Ci Tang® Si Miao Wan in the pill form, which has the same formulation as the tablet, is discontinued.

    Si Miao Pian tablets are made with 100% natural herbs that are tested for authenticity, quality, and potency. A traditional water decoction is prepared with the herbs to reproduce the time-tested efficacy of the formula, and this water decoction is concentrated with our proprietary technology to form a potent extract that is made into easily absorbed tablets, which are remarkably effective, easy to use, and safe. The tablets are produced by Guang Ci Tang® in our state of the art cGMP-certified facility and imported in accordance with U.S. FDA guidelines. When you choose Guang Ci Tang® products, you are taking advantage of a wonderful fusion of science and tradition that incorporates the highest standards in the field of Chinese medicine today.

    Guang Ci Tang® Advantages
    Effective. Safe. Affordable
    • True 5:1 concentration
    • Double the strength of other brands
    • Minimal or no fillers and binders
    • No pharmaceuticals, sugar, or dyes
    • Comprehensive lab testing (e.g., heavy metals,etc.)
    • Made in a cGMP certified facility
    • Unbeatable value
    • Safely used in the USA since 1995

    Check for an independent US lab test report.

    How do I use it?
    The standard dosage for Dampclear™ is 5 tablets each time, taken 2 to 3 times daily with or before meals. One bottle lasts 11 to 17 days. The dose may be doubled for a quicker and stronger response as needed (e. g., in an acute phase). Consult your practitioner for precise dosage recommendations based on body weight and other factors.

    Dampclear™ has a mild action and therefore it usually takes time before its effects become apparent. It may take one month or more before symptoms begin to improve. An initial course of treatment is suggested as 4 - 6 bottles taken at the full dose.

    Differentiation in Usage

    Side Effects
    Si Miao Pian (Wan) has been safely used with few adverse effects when used as directed.

    1. Not for use during pregnancy.

    Allergy Info
    Dampclear™ is gluten free

    In the Media

    1. Use with caution in conditions due to Yin deficiency.
    2. Not suitable for arthritis pain with chilly sensation.
    3. Consult your herbalist or physician before use if you are taking other medicines.
    4. Keep out of reach of children.


    1. Qiu R et al., Treatment of 60 cases of gouty arthritis with modified Simiao Tang. J Tradit Chin Med. 2008 Jun;28(2):94-7.
    2. Shi XD et al., Randomized and controlled clinical study of modified prescriptions of Simiao Pill in the treatment of acute gouty arthritis. Chin J Integr Med. 2008 Mar;14(1):17-22. doi: 10.1007/s11655-007-9001.
    3. Liu YF et al., The Effects of Modified Simiao Decoction in the Treatment of Gouty Arthritis: A Systematic Review and Meta-Analysis. Evid Based Complement Alternat Med. 2017;2017:6037037. doi: 10.1155/2017/6037037. Epub 2017 Mar 8.
    Dampclear™ (Si Miao Pian) is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from Surprising results I have had localized scleroderma in my left foot and leg since 2001. There is to my knowledge only one drug of "western" medicines that I was given 13 years ago, which made me ill, so I quite taking it after 6-8 months. I found Dampclear after doing some research in TCM. It is helping with the extreme swelling and redness, pain and lack of movement of my foot when it is swollen. This kind of swelling is not the kind of swelling that a diuretic pill can take care of. Dampclear seems to be helping keep the swelling under control and so far this summer, I've been having a better "go of it" because of that. I've been more comfortable.
    Date published: 2014-07-09
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