GNC SUPERFOODS KELP: Each tablet provides 33.75mg of kelp, plus 80mg of calcium and 225 mcg of iodine (from Kelp). VEGETARIAN FORMULA: These kelp tablets are suitable for a vegetarian diet. BACKED BY SCIENCE: Since 1935, GNC has been committed to meeting the highest standards of quality, safety, and efficacy while applying the most up-to-date advances in nutritional science so you can live well.