NutriVital Kelp 1400 One-A-Day capsules contains Fucus vesiculosus (kelp) 1400mg a source of naturally derived iodine which supports a healthy thyroid gland function and maintains the body’s metabolism. Fucus vesiculosus extract is a certified organic fucoidan ingredient sourced from seaweed (commonly known as bladderwrack) grows in the pristine ocean waters of Nova Scotia and Brittany where it is harvested on an environmentally sustainable basis.