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Amino Acids 39:727737

Tretinoin, a prescription vitamin A derivative, has been called the most potent and certainly the most widely investigated retinoid for photoaging therapy by researchers in a 2006 review.49 And a more recent 2022 review notes that studies on tretinoin consistently find it to be efficacious in improving [the] clinical appearance of photoaging.50 And many nonprescription ingredients, like niacinamide (for melasma),51 vitamin C (for wrinkles),52 and hyaluronic acid (for dry skin), have demonstrated positive outcomes in studies.53 Some of our favorite online dermatology options that weve reviewed are Curology, Agency, Prose, and Musely

Technically, mushrooms contain all nine essential amino acids, but they are typically limiting in sulfur-containing amino acids like methionine

Sinha I, Goel R, Bitzer ZT, Trushin N, Liao J, Sinha R (2022) Evaluating electronic cigarette cytotoxicity and inflammatory responses in vitro [journal article]