Although cucumbers aren't very high in vitamins or minerals, they contain a compound called cucurbitacin E, which may have beneficial effects on health. (mediatrendings.com)
This is very important, because bitter zucchini often contains high levels of a natural toxin called cucurbitacin (a chemical produced by all members of the Cucurbit family, which includes cucumbers, pumpkins and melons). (homemade-baby-food-recipes.com)
Finally, carrot contains very few natural plant toxins like cucurbitacins in cucumber or tomatine in tomato, and those which do exist are extremely safe for acne. (supernaturalacnetreatment.com)