Collagen is not just for your skin — it can do wonders for your joints and up your protein intake in a virtually tasteless way. Not into the flavor of protein powder? Add collagen to your favorite recipes . . . even water! You'll get branched-chain amino acids — essential for recovery — and 18 grams of protein per serving when you throw some in your smoothie, mug cakes, soups, or juices. Jennifer Aniston and Hannah Bronfman have been putting it in their smoothies, too!