People with thyroid issues should not have more than an average daily recommended intake of 158 to 175 micrograms of kelp per day, Dr. Nasr says. The concentration of kelp in foods is generally not enough to cause a problem, but a kelp capsule can contain as much as 500 micrograms, he says.Click to see full answer. Consequently, how much kelp powder should I take daily?To be safe, the FDA states that a kelp supplement should not provide more than 225 mcg of iodine per daily serving.One may also ask, are kelp tablets good for you? Nutrients: Sea kelp is a natural source of vitamins A, B1, B2, C, D and E, as well as minerals including zinc, iodine, magnesium, iron, potassium, copper and calcium. As sea kelp is the richest natural source of iodine it can help to regulate metabolism and in turn affect weight loss and gain. Also Know, can you take too much kelp? Side effects, toxicity, and interactions Both hyperthyroidism and hypothyroidism have been linked to too much kelp intake. This is due to its high amount of iodine. Abnormal thyroid function has also been linked directly to too much use of kelp supplements. Kelp may contain harmful metals.What are the side effects of kelp? Kelp Arthritis. Constipation. Gum disease. Heartburn. High blood pressure. Obesity.