Our list wouldn’t be perfect without asparagus. Asparagus is similar to avocados since both species have the same property – glutathione is the ingredient present in both avocados and asparagus. This compound is the strongest of all antioxidants. Our bodies are able to produce glutathione in a natural way. However, if your diet is poor and you live in a polluted city or take lots of medications, then you need more of glutathione to stay healthy. Asparagus can provide you with plenty of glutathione.