Health Guide
Drug Guide


What is it?

Bladderwrack is an herbal medicine that is used for weight loss, low thyroid hormone, atherosclerosis, menstrual problems, and heart disease. It is also used for constipation (difficulty having a bowel movement), upset stomach, high cholesterol, and high thyroid hormone. There are no human scientific studies to verify the use of Bladderwrack at this time.

Other names for Bladderwrack include: Fucus vesiculosus, Kelpware, Black-Tang, Bladder Fucus, Quwecus Marina, Sea Wrack, Sea-Oak, Marine Oak, and Seetang.

Ask your doctor, nurse, or pharmacist if you need more information about this medicine or if any information in this leaflet concerns you.

Before Using:

Tell your doctor if you


Talk with your caregiver about how much Bladderwrack you should take. The amount depends on the strength of the medicine and the reason you are taking Bladderwrack. If you are using this medicine without instructions from your caregiver, follow the directions on the medicine bottle. Do not take more medicine or take it more often than the directions tell you to.

To store this medicine:

Keep all medicine locked up and away from children. Store medicine away from heat and direct light. Do not store your medicine in the bathroom, near the kitchen sink, or in other damp places. Heat or moisture may cause the medicine to break down and not work the way it should work. Throw away medicine that is out of date or that you do not need. Never share your medicine with others.

Drug and Food Interactions:

Do not take Bladderwrack without talking to your doctor first if you are taking:


Side Effects:

Stop taking your medicine right away and talk to your doctor if you have any of the following side effects. Your medicine may be causing these symptoms which may mean you are allergic to it.

Other Side Effects:

You may have the following side effects, but this medicine may also cause other side effects. Tell your doctor if you have side effects that you think are caused by this medicine.


1. Fetrow CW & Avila JR: Professional's Handbook of Complementary and Alternative Medicines. Springhouse Corporation, Springhouse, PA; 1999.

2. Anon: British Herbal Pharmacopeia. British Herbal Medicine Association, Keighley, England; 1983.

3. McGuffin M, Hobbs C, Upton R et al: American Herbal Product Association's Botanical Safety Handbook. CRC Press, Boca Raton, FL; 1997.

4. Harrell BL & Rudolph AH: Kelp diet: a cause of acneiform eruption. Arch Dermatol 1976; 112: 560.

5. Kowalak JF & Mills EJ (Eds): Professional Guide to Complementary & Alternative Therapies. Springhouse Corp., Bethlehem Pike, PA; 2001.

Last Updated: 9/15/2016

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