El-Akawi Z1, Abdel-Latif N, Abdul-Razzak K. (2006). Does the plasma level of vitamins A and E affect acne condition? Clin Exp Dermatol. 2006 May; 31 (3): 430-4.
Ozuguz, Pinar & Dogruk Kacar, Seval & Ekiz, Ozlem & Takci, Zennure & Balta, Ilknur & Kalkan, Goknur. (2013). ”Evaluation of serum vitamins A and E and zinc levels according to the severity of acne vulgaris”. Cutaneous and ocular toxicology. 33. 10.3109/15569527.2013.808656.
Juliet M. Pullar, Anitra C. Carr and Margreet C. M. Vissers. The role of vitamin C in skin health. Nutrients 2017, 9, 866; doi:10.3390/nu9080866
Evans, J & Johnson, E. The role of phytonutrients in skin health. Nutrients 2010, 2, 903-928; doi:10.3390/nu208090.