Paula's Choice SKIN PERFECTING 2% BHA Liquid Exfoliant vs The Ordinary Salicylic Acid 2% Solution

The Ordinary Salicylic Acid 2% Solution

• GLYCERIN Skin effect
  Combined effects of glycerol and petrolatum in an emollient cream: A randomized, double-blind, crossover study in healthy volunteers with dry skin

  In a randomized, double-blind, four-arm crossover study of 51 healthy volunteers with dry skin, an emollient containing glycerol and petrolatum raised corneometry-measured skin moisture significantly above its vehicle (P < 0.0001) over 12 hours. The authors attributed the hydration gain to the glycerol component and the lower water loss to the petrolatum component.

  Human trial · 2020 · 51 people · healthy volunteers with dry skin (Kligman score 2 or 3) · Corneometry (skin moisture) and transepidermal water loss over 12 hours after one application. · Measured on the forearms. The significant hydration result comes from the full emollient containing both glycerol and petrolatum.

  PMID 31532576

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  Source:Combined effects of glycerol and petrolatum in an emollient cream: A randomized, double-blind, crossover study in healthy volunteers with dry skin
• GLYCERIN Skin effect
  Glycerol and the skin: holistic approach to its origin and functions

  Topical glycerol improves stratum corneum hydration, barrier function and skin mechanical properties. The review also reports reduced irritation response and faster wound healing, and traces the effect to aquaporin-3 transport and to glycerol's own presence in the skin.

  Review article · 2008 · Humans in the cited studies, plus animal and in-vitro work on mechanism · Leave-on products. The review discusses both healthy skin and skin with dry or barrier-impaired conditions such as atopic dermatitis. · A narrative review. It compiles mechanisms and results from other studies.

  PMID 18510666

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  Source:Glycerol and the skin: holistic approach to its origin and functions
• GLYCERIN Skin effect
  PubChem

  Glycerin is classified as a humectant in cosmetic ingredient databases: its role in a formula is to hold water.

  Official ingredient listing · Cosmetic formulas generally. · Ingredient database · GLYCERIN · Skin effect of to the stratum corneum comes from a separate review of the literature. · Ingredient database · GLYCERIN

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  Source:PubChemCosIng — European Commission cosmetic ingredient database