Sources starting with R

• Rajabi-Estarabadi 2024 — Infraorbital dark circles and puffiness

  A 2024 open-label study of a multicorrective topical eye product for infraorbital dark circles and puffiness.

• Randhawa 2016 — Daily Use of a Facial Broad Spectrum Sunscreen Significantly Improves Photoaging

  A 52-week prospective clinical trial published in Dermatologic Surgery in 2016 that evaluated daily use of a facial broad-spectrum SPF 30 sunscreen against photoaging endpoints.

• Robinson LR et al., "Topical palmitoyl pentapeptide provides improved skin appearance"

  A peer-reviewed clinical study evaluating topical Pal-KTTKS — the pentapeptide that became commercially known as Matrixyl — for the appearance of facial fine lines and wrinkles.