Scientists haven't extensively studied most of the possible health benefits of seaweed. But potential benefits include:

Improves thyroid function

Thyroid hormone helps regulate many of your body's functions, ranging from menstrual cycles to temperature control. Without enough iodine, your thyroid can’t make enough of this hormone (a condition called hypothyroidism). You could also develop a goiter, a visible enlargement of your thyroid. Iodine is especially important during pregnancy since it's involved in fetal brain development. Young children who have iron deficiencies are at risk for intellectual disabilities and stunted growth.

May improve gut health

Seaweed contains carbohydrates that act as prebiotics, which are nondigestible fibers that feed the healthy bacteria in your digestive tract. Sugars found in seaweed help boost the growth of this “good” bacteria and increase the level of short-term fatty acids that keep the lining of your gut healthy.

May improve heart health

Early studies have found a link between seaweed intake and a lower risk for heart disease. Some findings indicate that polyphenols, compounds found in seaweed, could help lower blood pressure, LDL or “bad” cholesterol, and total cholesterol levels.