Freckles. https://www.webmd.com/skin-problems-and-treatments/freckles-skin-spots#:~:text=Freckles%20are%20extra%20patches%20of,most%20likely%20to%20have%20them. Accessed October 15, 2022
MELASMA: OVERVIEW. https://www.aad.org/public/diseases/a-z/melasma-overview#:~:text=Melasma%20is%20a%20skin%20condition,diagnosis%20and%20individualized%20treatment%20plan. Accessed October 15, 2022
Retinoids: active molecules influencing skin structure formation in cosmetic and dermatological treatments. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6791161/#:~:text=Retinol%20stimulates%20fibroblasts%20to%20synthesize,of%20elastin%20fibres%20%5B14%5D. Accessed October 15, 2022
Beta Hydroxy Acids. https://www.fda.gov/cosmetics/cosmetic-ingredients/beta-hydroxy-acids#:~:text=While%20both%20AHAs%20and%20BHAs,with%20the%20use%20of%20AHAs.&text=Currently%2C%20the%20BHA%20most%20commonly%20used%20in%20cosmetics%20is%20salicylic%20acid. Accessed October 15, 2022
Hydroquinone. https://pubchem.ncbi.nlm.nih.gov/compound/Hydroquinone. Accessed October 15, 2022
Introduction. https://www.sciencedirect.com/topics/chemistry/hydroquinone. Accessed October 15, 2022
Dual Effects of Alpha-Hydroxy Acids on the Skin. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6017965/. Accessed October 15, 2022
TOPICAL TREATMENT OF MELASMA. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2807702/. Accessed October 15, 2022
Glutathione as a skin whitening agent: Facts, myths, evidence and controversies. https://ijdvl.com/glutathione-as-a-skin-whitening-agent-facts-myths-evidence-and-controversies/. Accessed October 15, 2022
AHA and BHA for Skin: What to Know. https://www.webmd.com/beauty/aha-bha-skin-exfoliate. Accessed October 15, 2022