Pomegranate juice, which is high in antioxidants and vitamin C, can preserve collagen from degradation and promote its formation.
 

Oranges are high in vitamin C, a key component for collagen formation and skin health. 
 

Pineapple includes bromelain, an enzyme that can reduce inflammation and increase collagen formation when ingested on a regular basis.

Lemons are high in vitamin C, which helps increase collagen formation and lead to better skin.
 

Berries such as raspberries, strawberries, and blueberries are abundant in antioxidants and vitamin C, which promote collagen formation.