https://www.ncbi.nlm.nih.gov/pubmed/23826827
Ozuguz P, Dogruk Kacar S, Ekiz O, Takci Z, Balta I, Kalkan G.
Evaluation of serum vitamins A and E and zinc levels according to the
severity of acne vulgaris. Cutan Ocul Toxicol
2014;33(2):99-102.
https://www.ncbi.nlm.nih.gov/pubmed/28369875
Chan H, Chan G, Santos J, Dee K, Co JK. A randomized,
double-blind, placebo-controlled trial to determine the efficacy and
safety of lactoferrin with vitamin E and zinc as an oral therapy for
mild to moderate acne vulgaris. Int J Dermatol
2017;56(6):686-690.
https://pubmed.ncbi.nlm.nih.gov/28220628/
Walocko FM, Eber AE, Keri JE, Al-Harbi MA, Nouri K. The role of
nicotinamide in acne treatment. Dermatol Ther 2017;30(5):.
https://pubmed.ncbi.nlm.nih.gov/25399625/
Rolfe HM. A review of nicotinamide: treatment of skin diseases
and potential side effects. J Cosmet Dermatol
2014;13(4):324-8.