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SourcesThe studies behind what we say about barrier repair
Where this comes from.
5 claims · 6 studies.
C5-1
Hard water dramatically increases barrier damage from surfactant cleansers — calcium/magnesium ions bind to surfactants and remain on skin after rinsing.
VerifiedOne source behind this claim
The record
The Effect of Water Hardness on Surfactant Deposition after Washing and Subsequent Skin Irritation in Atopic Dermatitis Patients and Healthy Control Subjects.
C5-2
Skin surface pH averages ~4.7-5.5; acidic pH keeps resident flora attached, alkaline disperses it; below-5 skin is in better barrier condition.
VerifiedOne source behind this claim
The record
Natural skin surface pH is on average below 5, which is beneficial for its resident flora.
C25-1
Ambient humidity and temperature strongly affect the stratum corneum; colder/drier regions show markedly higher population-level dry-skin burden than warm/humid ones.
VerifiedOne of 2 sources behind this claim · see the other
The record
Climate, Humidity, and Population-Level Interest in Dry Skin: Infodemiology Analysis Using Google Trends Across the United States.
VerifiedOne of 2 sources behind this claim · see the other
The record
Ambient humidity and the skin: the impact of air humidity in healthy and diseased states.
C25-2
Humectants (urea, glycerol) increase stratum-corneum hydration; occlusives reduce water loss by sealing the surface.
VerifiedOne source behind this claim
The record
Effects of water activity and low molecular weight humectants on skin permeability and hydration dynamics - a double-blind, randomized and controlled study.
C27-2
Skin's acidic pH supports barrier repair and antimicrobial defense; pH stays raised for hours after even a single wash.
VerifiedOne source behind this claim