GI Permeability Change in Response to Aquamin®

Inclusion Criteria for UC participants: * Must be able to give written informed consent * Age 18 to 80 years old. * Must have: Ulcerative colitis with confirmed diagnosis by histology and endoscopy; and be in stable remission for 3 months or more without therapy or with maintenance therapy (except steroids and antibiotics for 3 months) or have mild ulcerative colitis. Note: Corticosteroids (a type of steroid drug such as prednisone or cortisol that helps the body to regulate stress response, immune response and inflammation) and antibiotics can be used during a flare-up once the study has begun and the subject enrolled. * A negative pregnancy test for pre-menopausal women with intact female reproductive organs. Must agree to use appropriate birth control over the study period (if applicable). If cessation of menses is within 12 months, then the participant will be treated as pre-menopausal and a pregnancy test will be performed. Inclusion Criteria for Healthy participants: * Must be able to give written informed consent * Be generally healthy, male or female, ages 18 to 80 years old. * Pre-menopausal women with intact female reproductive organs must have a negative pregnancy test within 2 weeks of the Baseline Visit. * Subject must agree to use appropriate birth control over the study period. (Post-menopausal is defined as no menses for the previous 12 months. If cessation of menses is within 12 months, then the participant will be treated as pre-menopausal and a pregnanc…