Did you know that watercress is a very powerful cleanser for your body? This is because of it’s high chlorophyll and sulphur conents. It’s a great food for digestion, the skin and the bladder. It is a good source of iodine which is important for regulating metabolism and keeping the thyroid functioning properly. For the most nutritious watercress, be sure to buy it fresh rather than pre-packaged. You should also avoid purchasing watercress with leaves that are yellowing with brown spots.