Bladderwrack or Fucus vesiculosus is a type of seaweed or brown algae that grows along the northern Atlantic and Pacific coasts of the United states and the northern Baltic coast of Europe, according to the University of Michigan Health System. Bladderwrack is used in alternative medicine to treat health conditions such as constipation, heartburn, hypothyroidism, iodine deficiency and diarrhea. UMHS states that bladderwrack is generally safe, but does have some side effects and risks.
Acne
Bladderwrack contains high levels of iodine, which can aggravate acne in some people, according to UMHS. People who have a history of acne should not consume bladderwrack.
Thyroid Dysfunction
Although bladderwrack is used to treat hypothyroidism, because it contains iodine and excessive iodine can eventually cause disruption in the thyroid gland and cause hypothyroidism or hyperthyroidism, according to UMHS. If you have thyroid issues you should talk to your health care provider before taking bladderwrack.
Nerve Damage
Seaweeds like bladderwrack are harvested from waters or areas that may be heavily contaminated with metals like arsenic and lead which can cause problems such as kidney damage and nerve damage. Read labels carefully to make sure the bladderwrack you purchase was harvested in clean waters or tested for metals and other contaminants.
Allergy
If you are allergic to iodine you should not consume bladderwrack due to its high levels of iodine. Allergy symptoms such as breathing difficulties, rash, swelling of mouth or tongue, rapid pulse or flushing after ingesting bladderwrack should be addressed by a medical provider immediately.
Other Side Effects and Risks
Bladderwrack may cause low blood sugar, rash, stomach pain, bruising or increased bowel movements, according to the Huntsman Cancer Institute University of Utah. HCI also states that if you have a bleeding disorder, kidney disease, blood clots, nerve disorder and diabetes or have suffered a stroke that you should not consume bladderwrack.
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