INCI: Lecithin - Also known as: Phosphatidylcholine, Soy Lecithin, Sunflower Lecithin
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Key |
Value |
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INCI Name |
Lecithin |
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Category |
Phospholipid / Natural Emulsifier |
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Concentration in Formula |
Functional level in the Barrier Repairing Oil-Serum |
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Suitable For |
All skin types; particularly relevant for dry and barrier-compromised skin |
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Origin |
Plant-derived (typically from sunflower or soy; the form used is non-GMO) |
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Irritation Risk |
Zero - naturally occurring in skin's own cell membranes |
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Comedogenic Rating |
0-2 |
Lecithin is a naturally occurring phospholipid - a class of lipid molecules that form the structural backbone of cell membranes throughout the human body. In skincare, the term lecithin typically refers to a mixture of phosphatidylcholines derived from plant sources, most commonly sunflower or soy. Its defining structural feature is an amphiphilic molecular architecture: one end is water-attracting (hydrophilic) and one end is fat-soluble (hydrophobic). This dual-affinity character gives lecithin its unique ability to act as both an emulsifier and a penetration-supporting ingredient simultaneously.
In Sweet Chemistry's Barrier Repairing Oil-Serum, lecithin plays a specific functional role within the anhydrous formula. In a waterless environment without conventional emulsification chemistry, lecithin acts as a lipid dispersant - helping to distribute and stabilize the oil-soluble actives, ceramides, and lipid complexes evenly throughout the formula and against the skin's surface. Its presence below the 1% line alongside the ceramide complex reflects a precise formulation decision rather than a surface-level addition.
What makes lecithin particularly relevant in the context of a barrier-targeting formula is its structural identity as a phospholipid. The cell membranes of the skin's own keratinocytes are composed of phospholipid bilayers - lecithin is not a foreign molecule to the skin's lipid environment, but a familiar one.
Lecithin's primary contribution in skincare formulation is multi-layered. As a phospholipid, it is studied in connection with supporting the skin's intercellular lipid environment - particularly relevant in the context of a barrier-targeting formula that already delivers ceramides, cholesterol, and omega fatty acids. Research suggests that phospholipids may support the organization of the lamellar lipid bilayer by contributing familiar membrane-compatible lipids to the stratum corneum environment.
As a natural emulsifier, lecithin also facilitates the even distribution of oil-soluble actives across the skin's surface, potentially supporting their availability at the skin interface. In an anhydrous serum context, this dispersing function helps maintain formula homogeneity from first application to last - ensuring that each use delivers the same concentration of ceramides, THD ascorbate, CoQ10, and Matrikynes® peptides without settling or separation.
Research has also explored phosphatidylcholine's association with the skin's surface hydration environment and its potential to support moisture binding at the cell membrane level. In combination with the omega fatty acids and ceramide complex also present in the Oil-Serum, lecithin contributes to a comprehensive lipid-phase approach to barrier support - addressing multiple aspects of the lipid environment the skin's stratum corneum is understood to depend on.
In 1 Formula
Lecithin is specific to the Barrier Repairing Oil-Serum, where it serves as a phospholipid dispersant and lipid-compatible emulsifier within the anhydrous barrier lipid complex.
Nourishment - Dry to Combination
Barrier Repairing Oil-Serum Lecithin - 1.0 oz / 30 ml
A waterless, 100%-active serum delivering 7% THD ascorbate, 7% squalane, 3% Matrikynes® peptides, 3% ceramides, 1% cholesterol, 0.5% CoQ10, and 2% omega 3/6 fatty acids. Lecithin contributes phospholipid support and dispersion within the anhydrous barrier complex.
Barrier Lipid Ceramide NP + Ceramide NG
INCI: Ceramide NP, Ceramide NG.
The two ceramide types in the Oil-Serum, present at 3% as part of the full anhydrous barrier lipid complex. Synergy Note: Lecithin's phospholipid character supports the dispersion of the ceramide complex throughout the anhydrous formula, while ceramides are studied in connection with the lamellar bilayer structure that lecithin's phospholipid contribution complements.
Omega Fatty Acids Linoleic Acid / Linolenic Acid
INCI: Linoleic Acid, Linolenic Acid.
Essential fatty acids present in the Oil-Serum as part of the barrier lipid complex. Synergy Note: Lecithin, linoleic acid, and linolenic acid are all phospholipid-related or membrane-associated lipids - their co-presence creates a lipid environment that is studied in connection with the full spectrum of the skin's surface lipid requirements.
Skin-Identical Lipid Squalane
INCI: Squalane.
At 7% in the Oil-Serum, squalane is the primary emollient carrier and the largest single active by concentration. Synergy Note: Squalane provides the primary lipid carrier base; lecithin contributes phospholipid dispersion within it - together they support even distribution of every active in the formula across the skin's surface.
ECM Peptide Complex Matrikynes® Bone Peptides
INCI: Hydrolyzed Cow Bone Extract.
At 3% in all four formulas, associated with improvements in the appearance of skin density and aging signs. Synergy Note: Lecithin's role as a lipid dispersant in the Oil-Serum supports the even delivery of Matrikynes® peptides within the anhydrous base - helping ensure consistent active distribution with every application.
