When it comes to beauty, what you put in your body is just as important as what you put on it. You can put all the anti-aging creams and potions on your skin you want but if your diet is crap, your skin will look like crap, too.
As we age our skin loses elasticity. Two 2014 studies by Skin Pharmacology and Physiology show that a daily regimen of collagen can improve skin's elasticity and improve eye wrinkles by around 20%. I'm all in for something that works.
Collagen is important because it maintains our skin's firmness and elasticity. In English: collagen keeps our skin tight and youthful-looking.