Kelp (Laminariae stipites)

Published July 14, 1993.
List of German Commission E Monographs (Phytotherapy)


Name of Drug

Laminariae stipites, kelp.

Composition of Drug

Kelp consists of the dried, stem-like parts of the thallus of Laminaria hyperborea (Gunn.) Foslie (syn. L. cloustonii (Edmondston) Lejolis) [Fam. Lami-nariaceae], as well as preparations thereof.

Pharmacological Properties, Pharmacokinetics, Toxicology

Not known.

Clinical Data 1. Uses Preparations of kelp are used for the regulation of thyroid function, as well as in combination for goiter.

The effectiveness for the claimed applications is not verified.

2. Risks

Preparations containing a maximum daily dosage of 150 µg of iodine:

None known.

Above the dosage of 150 µg of iodine per day, there is danger that hyperthyroidism is induced or made worse. In rare cases allergic reactions involving serious overall reactions may occur.


Since the effectiveness for the claimed applications using a dosage below 150 µg iodine per day is not documented, a therapeutic administration cannot be recommended.

Above a dosage of 150 µg iodine per day, a therapeutic application cannot be recommended, because the effectiveness is not verified and the risks cannot be justified.