Seaweed and Kelp (brown or Laminaria type seaweed) are some of the best foods for patients of hypothyroidism. It is rich in many important minerals. Antibacterial and anti-viral activity in brown Laminaria type seaweed known as kelp. It kills herpes virus, for example. Kelp may also lower blood pressure and cholesterol. Wakame boosts immune functioning. Nori kills bacteria and seems to help heal ulcers. A chemical from wakame seaweed is a clot-buster, in one test twice as powerful as the common drug heparin. Most types of seaweed have anti-cancer activity. Might aggravate acne flare-ups.