Educational information, not medical advice — ask your doctor or midwife.
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Murex purpurea is a homeopathic remedy. It is made from the purple fish, a sea snail. Its Latin name is Bolinus (Murex) brandaris, and it is also called murex shellfish.
Homeopaths give it on its own, as a single drug, not in a blend. They use it mostly for women's complaints. These take in heavy periods, a dragging feeling low in the belly, and mood swings.
The snail is watered down over and over. At 30C, none of it is left in the pill. Long use in homeopathy is not proof of effect, and trials do not tell this remedy apart from a dummy pill.
Homeopaths work from an old rule they call 'like cures like'. They say a dose that would bring on signs in a well person can ease those same signs in a sick one.
At 30C the snail is gone from the pill. So there is no known way for it to act on your body.
When people feel better, the likely causes are time, care and hope. That is the placebo effect, which means feeling better from a dummy pill.
Sugar pellets are the most common form. You let them melt under the tongue.
You may also see liquid drops in alcohol, small tablets, or a mother tincture, which is the strong first mix.
Labels show strengths such as 6C, 30C, 200C or 1M. A higher number means more watering down, not more power. Shops sell 30C most often.
The purple fish has been prized for a very long time. Dyers around the old Mediterranean boiled these snails to make Tyrian purple, a royal dye.
Homeopaths took the snail up in the 1800s. They gave it to healthy people and wrote down what those people felt. From those notes came its use for women's complaints.
It has stayed a small, side remedy. It is known in homeopathic books, but it is not one of the main ones.
See a doctor if your periods soak through a pad or tampon every hour, if you pass large clots, or if you bleed between periods or after the menopause. Get help too for pain that stops you doing daily things, for a lump you can feel, or if you feel faint, short of breath or very tired.
Go to urgent care if you get a rash, swelling of the lips or face, or trouble breathing after a dose. That can be an allergic reaction.
And see a doctor if low mood is deep or lasting, or if you think about harming yourself.
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 Murex purpurea 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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