Are Mango peels eatable?

The majority of the antioxidants are in the skins of fruit and vegetables. Apples have pectin in the skin and I suspect the majority of the antioxidants of the tomato are in the skin also. The main reason folks peel their fruit and vegetables is to separate any pesticides from the meal. If they are washed properly there shouldn't be any reason not to eat the peels. I use my blender a lot to liquify my fruit and vegetables into smoothies. If the Mango peels are beneficial why not liquify them also. The seed inside the pit might also have have valuable minerals for health and fitness. It would seem the only thing to dispose of would be the stem and the hard woody pit. Orange peels are used to make marmalade so may-be they also are valuable resources or antioxidants. Through my blender liquifying these things with other tasty items any strong or bitter taste will be nullified. I do not add sugar or any artificial sweeteners. My goal is to have healthy smoothies rich in vitamins. minerals and antioxidants and proteins.Are there any peels or seeds of fruit or vegetables that are not eatable or toxic?