Fucus Vesiculosus


Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate. The effectiveness ratings for FUCUS VESICULOSUS are as follows:

Insufficient evidence to rate effectiveness for…

  • Obesity. Early research suggests that taking Fucus vesiculosus along with lecithin and vitamins doesn’t help people lose weight.
  • Achy joints (rheumatism).
  • Arthritis.
  • “Blood cleansing”.
  • Constipation.
  • Digestive problems.
  • “Hardening of the arteries” (arteriosclerosis).
  • Iodine deficiency.
  • Thyroid problems, including an over-sized thyroid gland (goiter).

Other conditions.

More evidence is needed to rate the effectiveness for these uses.

Side Effects Of Fucus Vesiculosus

Fucus vesiculosus is POSSIBLY SAFE when applied to the skin. It is POSSIBLY UNSAFE when taken by mouth. It may contain high concentrations of iodine. Large amounts of iodine can cause or worsen some thyroid problems. It may also contain heavy metals, which can cause heavy metal poisoning. Treatment of thyroid problems should not be attempted without medical supervision.

Warnings & Precautions

  • Pregnancy and breast-feeding: It is POSSIBLY UNSAFE during pregnancy and breast-feeding. Don’t use it.
  • Bleeding disorders: Fucus vesiculosus might slow blood clotting. In theory, it might increase the risk of bruising or bleeding in people with bleeding disorders.
  • Diabetes: Fucus vesiculosus may affect blood sugar levels. If you have diabetes and take medications to lower your blood sugar, adding it might make your blood sugar drop too low. Monitor your blood sugar carefully.
  • Infertility: Preliminary research suggests that taking Fucus vesiculosus might make it harder for women to get pregnant.
  • Iodine allergy: It contains significant amounts of iodine, which could cause an allergic reaction in sensitive people. Don’t use it.
  • Surgery: Fucus vesiculosus might slow blood clotting. There is a concern that it might cause extra bleeding during and after surgery. Stop taking at least 2 weeks before surgery.
  • Thyroid problems are known as hyperthyroidism (too much thyroid hormone), or hypothyroidism (too little thyroid hormone): Fucus vesiculosus contains significant amounts of iodine, which might make hyperthyroidism and hypothyroidism worse. Don’t use it.

Dosage Of Fucus Vesiculosus

The appropriate dose of Fucus vesiculosus 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. 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.


Consult your doctor or pharmacist.


All information has been provided courtesy of MedLinePlus from the National Library of Medicine and from the FDA.