The rind of the watermelon has vitamins B and C which are needed by the body, but we usually consume them in tablets.
Besides vitamins, the rind contains a large amount of citrulline -- an amino acid that is important for normal circulation and heart health, which contributes to the dilation of blood vessels and circulation improvements. Simply put, it can help improve your blood flow. It has been used to improve conditions as diverse as sexual dysfunction and sickle cell disease.
The watermelon rind candy is already a well known recipe that you can try out, but now all nutritionists recommend that you wash the watermelon rinds well and chop them into small cubes.
While fresh, you need to grind the rinds in a blender until you get a thick mixture. Then, you can add this mixture to freshly pressed juices and shakes.
How to include it in your diet: Blend along with watermelon flesh (the red part you normally eat), strawberries, and a dash of orange juice for a refreshing smoothie.