They’ve got lots of zinc, a nutrient that’s important for your skin. Among other things, it may help kill bacteria that cause certain kinds of acne. It also appears to help the body stop making chemicals that can cause inflammation — something else that’s linked to acne. Too much zinc can cause health problems, though. Adults shouldn’t get more than 40 milligrams a day.
Whether you eat it in a sushi roll, in a salad, or on its own as a salty snack, it’s a great source of iodine, which your thyroid gland needs to work properly. But too much iodine at once can make you break out. Most adults need 150 micrograms a day, though pregnant and breastfeeding women need more. If you eat a balanced diet, it’s hard to get too much. Along with seaweed, you can get iodine from foods like fish, dairy products, and iodized salt.