Side Effects of Kelp

Kelp supplements are derived from brown seaweed found in the ocean, according to "Alternative Cures: More than 1,000 of the Most Effective Natural Home Remedies." These supplements are commonly used to aid weight loss, regulate thyroid function and ease the pain of arthritis. However, it is important to remember that like all supplements, kelp supplements can cause a variety of side effects.

Hyperthyroidism

Kelp is commonly used to improve the function of the thyroid in people with hypothyroidism, which is a disease resulting in an underactive thyroid gland. When a person with a normal, healthy thyroid uses kelp, she runs the risk of overstimulating her thyroid gland, resulting in hyperthyroidism, which is also known as an overactive thyroid. According to "Introduction to Medical-Surgical Nursing," hyperthyroidism can lead to an array of health issues, including weight loss, mood disturbances, clubbed fingers and goiter.

Blood Thinning

Properties of the blood that lead to coagulation are impacted by kelp. This can be beneficial when attempting to thin blood. However, when blood lacks proper coagulation ability, hemorrhage becomes a concern. People taking blood thinners, such as warfarin, should avoid kelp supplements unless specifically prescribed by a treating physician. Additionally, kelp can interfere with tests that measure blood's rate of coagulation, such as the prothrombin time/international normalized ratio test that is known as the PT/INR.

Hypoglycemia

Kelp can lower blood glucose levels. Though this has the potential to be beneficial to someone with hyperglycemia, a condition known as elevated blood glucose, it can cause hypoglycemia, also known as low blood sugar, in someone with normal or low blood glucose levels. This can lead to a variety of health complications including dizziness and coma.