labial melanotic macula macule (brown spot on lip) (Stony Brook Case 1) dermatology dermatopathology Oral pathology: Noting a pigmented
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J Pharm Res 7:828835 [Google Scholar] Singh PP, Chandra A, Mahdi F, Ray A, Sharma P (2010a) Reconvene and reconnect the antioxidant hypothesis in human health and disease

It's a non-essential amino-acid-like compound, meaning it's produced in the body naturally
CrossRef Performance of Noninvasive Indices for Discrimination of Metabolic Dysfunction-Associated Steatotic Liver Disease in Young Adults Jaejun Lee, Chang In Han, Dong Yeup Lee, Pil Soo Sung, Si Hyun Bae, Hyun Yang Gut and Liver .2025

The true prevalence of the disease is unknown, but is estimated to be between 1:40,000 to 1:300,000