Rose hips are the edible part of a rose plant that contains sixty times the vitamin C content of citrus fruit. Studies have shown that orally ingest rose hips are an effective treatment against hyperpigmentation and skin wrinkles, as well as improve skin moisture and elasticity after four weeks if intake.
Fujii, T., Ikeda, K., & Saito, M. (2011). Inhibitory Effect of Rose Hip (Rosa canina L.) on Melanogenesis in Mouse Melanoma Cells and on Pigmentation in Brown Guinea Pigs. Bioscience, Biotechnology, and Biochemistry, 75(3), 489-495. doi:10.1271/bbb.100702
Winther, K., Wongsuphasawat, K., & Phetcharat, L. (2015). The effectiveness of a standardized rose hip powder, containing seeds and shells of Rosa canina, on cell longevity, skin wrinkles, moisture, and elasticity. Clinical Interventions in Aging, 1849. doi:10.2147/cia.s90092
Mármol, I., Sánchez-De-Diego, C., Jiménez-Moreno, N., Ancín-Azpilicueta, C., & Rodríguez-Yoldi, M. (2017). Therapeutic Applications of Rose Hips from Different Rosa Species. International Journal of Molecular Sciences, 18(6), 1137. doi:10.3390/ijms18061137
Schwager, J., Hoeller, U., Wolfram, S., & Richard, N. (2011). Rose hip and its constituent galactolipids confer cartilage protection by modulating cytokine, and chemokine expression. BMC Complementary and Alternative Medicine, 11(1). doi:10.1186/1472-6882-11-105