If you are allergic to bananas (remember that people with latex allergies should avoid bananas, too) or don't care for them, frozen mango is an excellent substitute.
1 cup apple juice
2-3 frozen strawberries
1 banana or 1/4 cup frozen mango
1/3 cup frozen mixed berries
1 serving whey protein powder
2 Tbs. unfiltered apple cider vinegar
1 tsp. flaxseed oil
Combine ingredients in blender and blend until smooth. Serve cold.