Cholesterol

INCI: Cholesterol 

Category: Skin-Identical Lipid / Barrier-Repair Active 

Used in: Barrier repair moisturisers, sensitive skin formulas, eczema and rosacea-targeted treatments 

Typical Usage Level (Topical): 1–4%

What This Ingredient Does

Cholesterol is a sterol lipid and a natural component of the stratum corneum, where it makes up approximately one-third of the intercellular lipid matrix alongside ceramides and free fatty acids. This three-component system ceramides, fatty acids, and cholesterol forms the lamellar bodies that create the skin's primary water-retention and barrier defence structure. When any one of the three components is deficient, barrier function is compromised. Topical cholesterol replenishes the skin-identical sterol component, restoring the correct molar ratio of the lipid trio and allowing the lamellar structure to reorganise correctly. It is particularly important in ageing skin, where endogenous cholesterol synthesis declines significantly, and in eczema-prone skin, where the ratio of all three lipid classes is chronically disrupted.

Must be formulated alongside Ceramide NP, Ceramide AP, Ceramide NP, and Linoleic Acid for genuine barrier restoration cholesterol alone does not restore the full lipid matrix.

Key Benefits

• Restores the correct molar ratio of the three-component barrier lipid system ceramides, fatty acids, and cholesterol

• Supports reorganisation of the lamellar structure for genuine barrier repair rather than surface-level occlusion

• Particularly relevant in ageing skin where endogenous cholesterol synthesis declines with age

• Reduces TEWL and calms barrier-disruption-related sensitivity and redness

• Non-irritating and skin-identical no sensitisation risk

Who It's Best For

• Eczema-prone, rosacea, or chronically sensitised skin with identified barrier dysfunction

• Mature skin (45+) where declining sterol synthesis compromises barrier integrity

• Post-procedure skin requiring structured barrier restoration

• Anyone using a ceramide-based moisturiser the ceramide only approach is incomplete without cholesterol and fatty acids in the correct ratio

Clinical Note by Dr. Su

Cholesterol is the most overlooked component of the barrier lipid trio. Most barrier repair products lead with ceramides, which is correct but ceramides alone do not fully restore lamellar structure without cholesterol and free fatty acids at the right ratio. If a patient's barrier cream contains ceramides but no cholesterol, it is doing partial work. Look for all three on the ingredient list.

References

• Elias PM & Feingold KR. (2001). Skin barrier function. Dermatologic Therapy. PMID: 11403525

• Mao-Qiang M, et al. (1996). Exogenous nonphysiological versus physiological lipids. Archives of Dermatology. PMID: 8651715