Works together with ceramides and fatty acids to rebuild barrier structure
Helps reduce water loss through the skin
Supports overall barrier resilience, especially in dry or compromised skin
Best used in the correct ratio alongside ceramides and fatty acids
Cholesterol Description
Cholesterol is one of three key lipids, alongside ceramides and fatty acids, that make up the skin's outer barrier structure.
Foundational research testing various combinations of these three lipids found that a molar ratio of roughly 3 parts ceramide to 1 part cholesterol to 1 part fatty acid, mirroring the proportion found naturally in healthy skin, accelerated barrier recovery after skin was experimentally damaged, meaningfully outperforming mixtures missing cholesterol or using an uneven ratio.
This finding is why cholesterol rarely appears as a standalone active ingredient and is instead almost always formulated specifically alongside ceramides and fatty acids in that approximate ratio, a combination now considered a well established benchmark for effective barrier repair formulas.
Cholesterol References
Man MQ, Feingold KR, Thornfeldt CR, Elias PM. Optimization of Physiologic Lipid Mixtures for Barrier Repair, Journal of Investigative Dermatology, 1996
Benefits of Topical Natural Ingredients in Epidermal Permeability Barrier, PMC, 2024
Our team reviews ingredient research and uses up-to-date evidence to rate ingredients based on the categories below.
Best
Ingredients with the most rigorous and convincing evidence. These are the standouts backed by consistent findings across independent, peer reviewed clinical research.. When we call an ingredient Best, it has earned that distinction through genuine, reproducible proof that it improves skin.
Good
Reliable, well tolerated ingredients that do their job without complaint. They may not carry the headline benefits of a Best rated active, but they hydrate, stabilize a formula, or support the ingredients around them in ways that make a real difference in how a product performs and feels.
Average
Ingredients that are perfectly safe and serve a clear function, typically as an emollient, thickener, or filler, but do not offer any meaningful skin benefit beyond that basic job. Not a red flag, just not a reason to choose one product over another.
Bad/Worst
Ingredients with documented potential to irritate skin, disrupt the barrier, or trigger sensitization in some users, often synthetic fragrance, drying forms of alcohol, or certain essential oils. Not automatically a dealbreaker for every skin type, but worth knowing about before you commit to a product.
