Sources starting with S

• Schagen 2017 — Topical peptide treatments with effective anti-aging results

  A peer-reviewed cosmetic peptide review used for general peptide context around eye-area products and appearance-only peptide language.

• Skin Cancer Foundation — Sun Protection

  The Skin Cancer Foundation's broader sun-protection landing page.

• Skin Cancer Foundation — Sunscreen

  The Skin Cancer Foundation's standing patient-facing reference page on sunscreen.

• Souza 2013 — Haloxyl and periorbital hyperpigmentation

  A peer-reviewed comparative study that included 2 percent Haloxyl gel as one topical option for periorbital hyperpigmentation and dark-circle appearance.

• Supergoop! Unseen Sunscreen SPF 50 — Official Product Page

  The official Supergoop page documents Unseen Sunscreen SPF 50 product facts, active UV filters, listed price, broad-spectrum positioning, and formula details.