If your skin handles both, you can layer them: Vitamin C first, then Azelaic Acid
Sci Rep 9(1):8384 Fell MJ et al (2015) Glutamatergic regulation of brain histamine neurons: In vivo microdialysis and electrophysiology studies in the rat
Additional studies have reported antiepileptic, wound-healing, and immunomodulatory properties [6,8]
Genital Melanosis Melanosis (lentiginosis) can occur in both in genital and oral mucosa and genital melanosis (genital lentiginosis, mucosal melanosis) is an infrequent and benign condition
fine lines and minor creases and improving the appearance of three types of wrinkles: crows feet, inner corner creases, and dehydration lines
Mayo Foundation for Medical Education and Research