I think you are talking about the natural ruccola green, then it is definitely a very good addition to your diet, because it indeed has a lot of health benefits, including the lowering of blood sugar. Therefore, it is a good idea to eat it on a regular basis.
As for the ruccolla supplements, I would not spend the money on them, since there are much more effective supplements for this purpose. All in all, it is very good to include this green in to your diet, but don't expect much from the supplement.