Kelp is a sea vegetable or seaweed that is a concentrated source of minerals, including iodine, potassium, magnesium, zinc, calcium, iron and betacarotene. Kelp as a source of iodine assists in making thyroid hormones, which are necessary for maintaining normal metabolism in all cells of the body.
What it does
Mild deficiency of iodine can lead to a sluggish metabolism and weight gain.
As a rich source of nutrients, some people take kelp to improve the condition of their hair, nails and skin.
High intakes of kelp may provide too much iodine and interfere with normal thyroid function.
People with thyroid disease should check with a doctor before taking supplements that contain kelp.