Sources starting with S

• Schagen 2017 — Peptide review

  Cosmetic peptide review used for topical peptide category context.

• Seborrhoeic dermatitis

  DermNet seborrhoeic dermatitis guidance supports differential language for flaky skin around the nose and persistent facial scaling.

• Sensitive skin

  DermNet sensitive skin guidance supports stinging, burning, and trigger language.

• Sensitive skin

  DermNet sensitive-skin guidance supports cautious education about stinging, burning, barrier disruption, and irritant triggers.

• Sephora Product Page — Sunday Riley C.E.O. 15% Vitamin C Brightening Serum

  Sephora product page used as retailer cross-check for Sunday Riley C.E.O.

• Sephora Product Page — The Ordinary Alpha Arbutin 2% + HA

  Sephora product page used as a retailer cross-check for Alpha Arbutin 2% + HA price, hyperpigmentation positioning, key ingredients, and retailer INCI details.

• Sephora Product Page — Topicals Faded Serum

  Sephora product page used as a retailer cross-check for Faded Serum price, dark-spot positioning, ingredient callouts, and retail INCI details.

• Skin ageing

  DermNet explains how cumulative ultraviolet exposure contributes to visible photoageing signs such as texture change, wrinkles, and uneven pigmentation.

• Skin Cancer Foundation — Sun Protection

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

• Skin Cancer Foundation. "Sunscreen."

  Skin Cancer Foundation.

• Skin Cancer Foundation — UV Radiation

  Dermatology education source used for UV exposure and protection context.

• Snail slime extract and skin repair

  PubMed search context for snail secretion filtrate supports a conservative evidence rating for snail mucin skincare claims.

• Sodium PCA natural moisturizing factor skin

  PubMed sodium PCA and NMF literature supports cautious humectant discussion.

• Solar lentigo

  DermNet solar lentigo guidance supports age spot terminology, sun-exposure links, benign-lesion context, prevention language, and clinician-boundary context.

• 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.

• Squalane and skin barrier function

  PubMed squalane literature supports cautious discussion of squalane as a lightweight emollient for dry or sensitive-feeling skin.

• Sun-Damaged Skin: Photoaging, Signs, Causes & Treatment

  Cleveland Clinic explains sun-damaged skin and photoaging signs, supporting careful cosmetic framing around UV-driven wrinkles, rough texture, and tone.

• Sun Protection

  Sun Protection was used to keep this skincare page grounded in conservative, appearance-level guidance.

• Sunscreen: How to Help Protect Your Skin from the Sun

  FDA sunscreen guidance supports sunscreen use and limitation language.

• 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.