Other compounds

Kelp

Also called: bladderwrack, seaweed tablets

Dried seaweed tablets, rich in iodine.

Why people take it
Thyroid, weight.
What the evidence says
No evidence for weight loss.
How it is usually taken
Tablets; iodine content can be very high.
Be careful
Can contain very high iodine and arsenic; can cause thyroid problems.
Medicines it can interact with
Affects thyroid medicines and amiodarone; may contain arsenic.

Other other compounds

Alpha-lipoic acidResveratrolQuercetinPterostilbeneNMNSpermidineFisetinPQQSulforaphaneDIMDHEAMelatoninCaffeine and L-theanineCannabidiol (CBD)Hemp seedBee pollenRoyal jellyPropolisManuka honeyChlorophyll

Common questions

What is Kelp?

Dried seaweed tablets, rich in iodine.

Why do people take Kelp?

Thyroid, weight.

Does Kelp work?

No evidence for weight loss.

How much Kelp do people take?

Tablets; iodine content can be very high.

Is Kelp safe?

Can contain very high iodine and arsenic; can cause thyroid problems.

Does Kelp interact with medicines?

Affects thyroid medicines and amiodarone; may contain arsenic.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.