Our bodies are teeming with collagen that gives our bones strength and our skin elasticity while replacing dead skin cells to keep us looking fresh.

But as we age, we deplete our stores of the restorative protein, leaving us to seek out an alternative source.

Collagen injections have been a popular anti-aging procedure for decades, but now many companies are marketing the youth-restoring stuff in everything from powders to pill, serums and, now, smoothies.