Bladderwrack is a type of ocean kelp or seaweed. In some Asian cultures, bladderwrack and other kelps and seaweeds are often used in traditional cultural dishes. Additionally, it has been used medicinally throughout the world, according to the National Institutes of Health. Bladderwrack is also known by several other names, including Fucus vesiculosus--its scientific name--seawrack and bladder fucus. Always consult a health care professional before using bladderwrack to improve your health.
Geography
Bladderwrack is a brown seaweed that can be found along coastal portions of Asia and Europe. It grows natively along the northern costs of the Atlantic and Pacific oceans as well as the Baltic and North seas, according to the Huntsman Cancer Institute at the University of Utah. It commonly grows alongside another type of brown seaweed, Ascophyllum nodosum.
Medicinal Uses
Today, bladderwrack has many purported medicinal uses. Among its uses: treating cancer, diabetes and thyroid conditions, according to the National Institutes of Health. It is also touted for its antioxidant, antibacterial, antifungal and anticoagulant properties as well as for promoting weight loss. However, studies showing whether the kelp is effective in treating these conditions are lacking.
How It Works
When used medicinally, how bladderwrack works depends on what condition it is being used to treat. For example, the iodine content in the plant may make it effective in treating goiters and other thyroid conditions, according to Memorial Sloan-Kettering Cancer Center. The iodine content is also why it is said to aid in weight loss. The polyphenols in the seaweed are said to be the reason for the antioxidant and antibacterial properties.
Dosages
Proper dosing of bladderwrack supplements depends on the form you are using. The kelp is available in capsules, tablets and extracts. Topical preparations are also available, mainly used as a weight loss aid. People taking bladderwrack tablets can gradually increase their consumption to a maximum of 24 tablets daily, according to the National Institutes of Health. Between 200 milligrams and 600 milligrams of the herbal supplement can be consumed in capsule form. When using the extract, proper dosing is between 4 milliliters and 8 milliliters, and it should be taken before meals.
Side Effects
Commonly reported side effects of bladderwrack supplements include acne or a worsening of acne and a decrease in iron absorption, according to the University of Pittsburgh Medical Center. Also, because the kelp can be grown in waters contaminated with toxic heavy metals, some serious side effects are possible, including kidney failure and nerve damage. To prevent against this, look for bladderwrack products that are labeled as being harvested from clean waters.
Warnings
The high iodine content and potential for heavy metals contamination can be especially dangerous for women who are pregnant or breastfeeding and those with kidney disease, according to the University of Pittsburgh Medical Center. Bladderwrack supplements are also not safe for children. Because the iodine content in the kelp varies greatly, people using it to treat thyroid conditions should use caution, because it can have unintended effects on thyroid function.
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