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LAMINARIA

Other Names:

Algue Brune, Brown Algae, Brown Seaweed, Hai Dai, Kelp, Kombu, Kun Bu, Laminaire, Laminaire Digitée, Laminaire Japonaise, Laminaria digitata, Laminaria japonica, Laminariae stipites, Limu, Makombu Thallus, Sea Girdles, Seagirdle Thallus, Thallus...
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LAMINARIA Overview
LAMINARIA Uses
LAMINARIA Side Effects
LAMINARIA Interactions
LAMINARIA Dosing
LAMINARIA Overview Information

Laminaria is a type of seaweed that is native to Japan. Laminaria contains iodine, an element that the body needs to make thyroid hormones. It is also a rich source of iron and potassium. Despite serious safety concerns about laminaria, some people use laminaria as medicine.

Laminaria is used for weight loss, high blood pressure, as a bulk laxative for constipation, and for treating radiation sickness. It is also used for preventing cancer.

Sometimes healthcare providers use laminaria to expand the cervix, the mouth of the uterus, before certain medical procedures. They place a layer of laminaria directly inside the cervix, the “neck” of the uterus. This layer of laminaria is sometimes called a “tent.” The purpose of the tent is to enlarge the cervix before “D&C,” also known as dilation and curettage (scraping of the uterus); removal of a medical device that is in the uterus; diagnostic procedures; placement of radium for cancer treatment; and other gynecological procedures. Laminaria tents are also used in pregnant women to “ripen” (expand) the cervix to make labor and delivery easier, and also to cause abortions during the first three months of pregnancy.

How does it work?

Laminaria seems to be able to form a thick, sticky gel when it comes into contact with water. This allows laminaria to work as a bulk laxative. It also allows laminaria “tents” that have been placed inside the cervix to expand the cervix for procedures or to “ripen” the cervix and speed up the onset of labor. These laminaria tents absorb water, gradually swelling to a diameter of 1/2 inch over 4-6 hours. This swelling causes the cervix to expand, and that can bring on labor.

LAMINARIA Uses & Effectiveness What is this?

Possibly Ineffective for:

  • Preparation ("ripening") of the cervix in women, such as during childbirth or procedures. Although laminaria might speed up childbirth, it doesn't seem to reduce the number of women who need Cesarean sections to deliver. Laminaria also increases the chance of infection in both mother and infant.

Insufficient Evidence for:

  • Weight loss.
  • High blood pressure.
  • Cancer prevention.
  • Heartburn.
  • Other conditions.
More evidence is needed to rate the effectiveness of laminaria for these uses.


LAMINARIA Side Effects & Safety

Laminaria is POSSIBLY UNSAFE when taken by mouth. It contains iodine in amounts that are high enough to harm the thyroid, the gland that uses iodine to make hormones. The average laminaria-based supplement might contain as much as 1000 mcg of iodine. Taking in more than 150 mcg of iodine per day can cause a normal thyroid to become overactive or underactive, or make an overactive thyroid worse. Some laminaria products also contain significant amounts of arsenic, a chemical element that is poisonous.

Special Precautions & Warnings:

Pregnancy and breast-feeding: The use of laminaria directly on the cervix during pregnancy or childbirth is UNSAFE. It can cause serious side effects for both mother and child, including infection, rupture of the cervix, and infant death. Taking laminaria by mouth during pregnancy is also UNSAFE because laminaria can affect hormones.

Taking laminaria by mouth during breast-feeding is LIKELY UNSAFE because laminaria might contain some poisonous chemicals.

If you are pregnant or breast-feeding, it’s best to avoid laminaria.

Kidney problems: Laminaria might cause dangerously high potassium and iodine levels. Don’t take laminaria if you have kidney problems.

Thyroid problems: Laminaria contains significant amounts of iodine, which might make thyroid problems worse.

LAMINARIA Interactions What is this?

Moderate Interaction Be cautious with this combination

  • Digoxin (Lanoxin) interacts with LAMINARIA

    Laminaria contains large amounts of potassium. Large amounts of potassium can increase the effects and side effects of digoxin (Lanoxin). Do not take laminaria if you are taking digoxin (Lanoxin).

  • Medications for high blood pressure (ACE inhibitors) interacts with LAMINARIA

    Laminaria contains large amounts of potassium. Some medications for high blood pressure can increase potassium levels in the blood. Taking laminaria along with some medications for high blood pressure might cause too much potassium in the blood.

    Some medications for high blood pressure include captopril (Capoten), enalapril (Vasotec), lisinopril (Prinivil, Zestril), ramipril (Altace), and others.

  • Potassium supplements interacts with LAMINARIA

    Laminaria contains large amounts of potassium. Taking potassium supplements along with laminaria might cause too much potassium to be in the body. Do not take laminaria if you are taking potassium supplements.

  • Thyroid hormone interacts with LAMINARIA

    The body naturally produces thyroid hormones. Laminaria might increase how much thyroid hormone the body produces. Taking laminaria along with thyroid hormone pills might increase the effects and side effects of thyroid hormones.

  • Water pills (Potassium-sparing diuretics) interacts with LAMINARIA

    Laminaria contains large amounts of potassium. Some "water pills" can also increase potassium levels in the body. Taking some "water pills" along with laminaria might cause too much potassium to be in the body.

    Some "water pills" that increase potassium in the body include amiloride (Midamor), spironolactone (Aldactone), triamterene (Dyrenium), and others.


LAMINARIA Dosing

The appropriate dose of laminaria depends on several factors such as the user’s age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for laminaria. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.

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Conditions of Use and Important Information: This information is meant to supplement, not replace advice from your doctor or healthcare provider and is not meant to cover all possible uses, precautions, interactions or adverse effects. This information may not fit your specific health circumstances. Never delay or disregard seeking professional medical advice from your doctor or other qualified health care provider because of something you have read on WebMD. You should always speak with your doctor or health care professional before you start, stop, or change any prescribed part of your health care plan or treatment and to determine what course of therapy is right for you.

This copyrighted material is provided by Natural Medicines Comprehensive Database Consumer Version. Information from this source is evidence-based and objective, and without commercial influence. For professional medical information on natural medicines, see Natural Medicines Comprehensive Database Professional Version. © Therapeutic Research Faculty 2009.

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