Collagen for skin rejuvenation
In this meta-analysis of randomized controlled trials, supplementing with collagen was found to improve markers of skin aging. However, collagen was often combined with other supplements, making it hard to say how much collagen was responsible for the effect.
Polar lipids from wheat may improve skin characteristics
Soy protein may improve facial skin appearance in postmenopausal women
Fruit and fruit extracts may improve skin hydration
Fighting wrinkles with a cream containing 1-monoeicosapentaenoin