Educational information, not medical advice — ask your doctor or midwife.
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Sandarus is a pale yellow tree resin. It is the dried sap of a small North African conifer, Tetraclinis articulata. It is also sold as sandarac resin.
In Persian and Unani medicine it is used as a drying, binding remedy. Healers put it on wounds and sore gums. They also gave it by mouth for loose stools and for piles (swollen veins around the back passage).
Outside medicine it is best known as a varnish and as an incense. Woodworkers and old-time dentists both used it.
Long use is not proof of effect. No human trials support any health use of this resin, so the evidence grade here is the lowest one we have. This point is made once, here, and applies to the whole page.
The short answer is that no one has shown how it works in people.
Sandarus is full of sticky plant acids. These may dry and tighten the surface of skin or a sore. Herbalists call that an astringent (drying, tightening) action.
That idea comes from lab work and from the way the resin behaves. It does not come from tests in people.
Unani texts explain it their own way. They call it hot and dry, and use it to dry up damp problems such as loose stools. That is an old model of the body, not a test result.
You may meet sandarus in these forms:
Whole lumps, called tears, sold as incense or as raw resin.
Coarse powder, used in Unani mixtures and tooth powders.
Alcohol tincture, since the resin melts into alcohol but not water.
Ointments, pastes and plasters for use on the skin.
Varnish-grade resin sold for wood and art. This is not a food or medicine and may hold solvents. Never swallow it.
Sandarus is an old trade good. Greek and Roman writers knew the resin, and it was burned as incense across North Africa and the Middle East.
Persian and Unani doctors listed it as a single drug, or mufrad. They used it to dry wounds, firm the gums and settle loose bowels.
European pharmacies later stocked it, mainly as a varnish and as a dental glue. Its standing rests on long use in one main tradition, not on modern testing.
See a doctor if loose stools last more than two days, or if you see blood in the stool, have a fever, or feel faint and very thirsty. Get help the same day for a wound that is red, swollen, hot or leaking pus. Call for emergency help straight away if your face, lips or tongue swell, if a rash spreads fast, or if you find it hard to breathe. Go to an emergency department at once if anyone swallows varnish-grade resin.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Sandarus is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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