Cucumber Collagen Face Mask I just finished rinsing off this mask in the shower, and I love how smooth my skin feels. I’ve been adding collagen to my green smoothies for a few months now, but it only recently occurred to me to use it in a face mask too. Collagen is said to be incredibly beneficial for skin, hair, and nails. While I can't speak for nails since mine are naturally strong, I can definitely see a difference in my hair — it's fuller and shinier. But the most notice