INCI: Cholesterol - Also known as: Skin-Identical Lipid, Physiological Cholesterol

QUICK FACTS

What is cholesterol?

Cholesterol is one of three essential intercellular lipids - alongside ceramides and free fatty acids - that make up the stratum corneum's lipid matrix, the biological mortar that holds your barrier together. In healthy skin, cholesterol accounts for roughly one-third of this matrix. Research suggests that as skin ages or is exposed to chronic stress, UV damage, or harsh actives, this ratio can shift and barrier integrity may be affected as a result.

The cholesterol used in skincare formulation is typically derived from plant sources (phytosterols converted to cholesterol), with the plant-derived form being the cleaner, more sustainable choice. At Sweet Chemistry, cholesterol is formulated at 1% as a standalone active in the Hydra-Serum and Oil-Serum, and as part of the 3% ceramide/phytosphingosine/cholesterol complex in both creams - designed to mirror the lipid ratios associated with youthful, healthy-looking skin.

What distinguishes physiological cholesterol from many other moisturizing agents is that it is designed to integrate into the lipid bilayer rather than simply coat the surface. Research in this area suggests it works within the skin's structural environment rather than masking the visible effects of barrier disruption.

What does it do for skin?

Cholesterol is studied in connection with its role alongside ceramides and free fatty acids in supporting the structural integrity of the stratum corneum. Foundational research has explored the relationship between these three lipids and barrier recovery - suggesting that the presence of all three may be important for the barrier to repair itself at an appropriate rate. By including all three within the same formula, Sweet Chemistry provides the skin with the complete lipid set associated with this research-based barrier approach.

At the functional level, restored cholesterol levels are associated with reduced trans-epidermal water loss (TEWL), improved skin moisture retention, and a more comfortable-feeling surface. For skin that appears dry, sensitized, or that has been disrupted by active ingredient overuse, cholesterol is one of the more thoroughly evidence-backed barrier lipids in the dermatological research literature.

Across the four Sweet Chemistry formulas, cholesterol works alongside ceramide NP, ceramide AP, ceramide EOP, and phytosphingosine - together forming a lipid environment associated with the conditions of a healthy, well-functioning barrier, regardless of age or prior disruption.

FOUND IN

In All 4 Formulas

Cholesterol is present across the entire Sweet Chemistry Max Repair System, reflecting its classification as a foundational barrier lipid - not a finishing touch.

Nourishment - All Skin Types

Barrier Repairing Hydra-Serum 1% Cholesterol - 1.0 oz / 30 ml

The Hydra-Serum combines 1% cholesterol with 3% ceramides (NP, AP) and 5% niacinamide for a comprehensive, water-based barrier lipid approach. The lightest formula in the system for all skin types.

Hydration - Dry to Normal

Elasticity Reinforcing Hydra-Cream 3% Ceramide/Phytosphingosine/Cholesterol Blend - 1.7 oz / 50 ml

In the Hydra-Cream, cholesterol is formulated within a full barrier lipid complex alongside ceramides EOP, AP, NP and phytosphingosine. Paired with 3% Matrikynes® peptides and 2% THD ascorbate in a cushioned satin finish for dry to normal skin.

Hydration - Dry to Dehydrated

Elasticity Reinforcing Lipid-Cream 3% Ceramide/Phytosphingosine/Cholesterol Blend - 1.7 oz / 50 ml

The richest water-based formula in the system, designed for dry and dehydrated skin. The barrier lipid blend works alongside shea butter, sea buckthorn seed oil, and jojoba seed oil for both structural lipid support and deep emollience.

Nourishment - Dry to Combination

Barrier Repairing Oil-Serum 1% Cholesterol + Full Barrier Lipid Complex - 1.0 oz / 30 ml

The waterless Oil-Serum delivers cholesterol as part of a full barrier complex including 3% ceramides, 2% omega 3/6, and 0.2% phytosphingosine - in a 100%-active, zero-carrier-oil base.

WORKS TOGETHER WITH

Barrier Lipid Ceramide NP + Ceramide AP

INCI: Ceramide NP, Ceramide AP.

Physiological ceramides present across all four formulas, forming the primary lipid component of the barrier complex alongside cholesterol. Synergy Note: Research on barrier lipid ratios suggests ceramides and cholesterol may need to coexist in appropriate balance to support lamellar body structure - delivering them together addresses the barrier's lipid needs more completely than either alone.

Barrier Lipid Phytosphingosine

INCI: Phytosphingosine.

A sphingoid base present alongside cholesterol in every formula, studied in connection with ceramide biosynthesis pathways and a more comfortable skin surface. Synergy Note: Phytosphingosine is researched in connection with the skin's own ceramide production while cholesterol is studied for its structural role in the lipid bilayer - together they approach barrier lipid support from two complementary directions.

ECM Peptide Complex Matrikynes® Bone Peptides

INCI: Hydrolyzed Cow Bone Extract.

A 3% complex of over 315 bioactive matrikine peptides in all four formulas, associated with improvements in the appearance of skin density and aging signs. Synergy Note: Cholesterol supports the epidermal barrier environment while Matrikynes® targets the deeper dermal matrix - a two-layer approach that addresses both the surface barrier and structural density simultaneously.

Omega Fatty Acid Linoleic / Linolenic Acid

INCI: Linoleic Acid, Linolenic Acid.

Essential fatty acids present in the Hydra-Serum and Oil-Serum, contributing the free fatty acid component of the complete barrier lipid trio. Synergy Note: Linoleic acid is studied as the primary free fatty acid in the skin's intercellular matrix; combined with cholesterol, it helps complete the three-lipid system associated with the conditions for optimal barrier lipid organization.