If you don't like or can't tolerate an ingredient, you should of course omit it or replace it with another ingredient. In general, any substitution will change the taste of the recipe, but it can also create a completely new delicious taste.
Leafy greens: Many leafy greens are interchangeable - e. G. if you don't like spinach, you can add postelein, lamb's lettuce, romaine lettuce, as well as radish leaves and other mild lettuce varieties to your smoothie instead.
Banana: creates a creamy and sweet smoothie flavor. Alternatively, you can use avocado or mango as creamers, or (mountain) peaches if necessary.
Apples and pears: other aromatic and sweet fruits are suitable here, e. G. red or green grapes, different berry varieties (e. G. blueberries), different melon varieties such as honey melon, cantaloupe melon, passion fruit, pineapple, mango, dates, bananas.
Pineapple: can be substituted for kiwi (and vice versa).
Goutweed: parsley tastes similar.