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Moumoujus

LECITHIN.

Valuable CAS 8002-43-5 / 8030-76-0 (soybean) / ANTISTATIC, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SURFACTANT - EMULSIFYING

Lecithin, a fundamental phosphoglyceride, is a versatile ingredient that optimizes skin hydration and barrier function. It effectively delivers active compounds into the skin while providing antioxidant protection against environmental stressors.

Summary

Antistatic Emollient Emulsifying Skin conditioning Water-binding Stabilization Liposome formation / Ingredient delivery Antioxidant Barrier strengthening

Science

Mechanism of Action

Lecithin operates as a powerful humectant and emollient, drawing and sealing moisture into the skin while forming a protective barrier to mitigate trans-epidermal water loss (TEWL). It strategically strengthens the skin's native lipid barrier, crucial for defense and repair. Furthermore, its unique ability to form liposomes makes it an excellent penetration enhancer, facilitating the deeper transport of active molecules. The ingredient also provides antioxidant benefits, combating free radicals, and preliminary research suggests potential anti-inflammatory and collagen-stimulating effects.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Human skin irritation and sensitization studies confirm that lecithin is nonirritating and nonsensitizing in leave-on products at concentrations up to 15%.
  2. 02 Studies utilizing lecithin-containing liposomes in murine skin demonstrated 30% penetration to the subdermis, while in piglet skin, 99% accumulated within the stratum corneum, highlighting its efficiency in enhancing topical delivery through the skin barrier.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Lecithin, a waxy substance, is soluble in both aqueous and lipid phases and swells in water, functioning as an emulsifier for both O/W and W/O systems. While regular lecithin is prone to oxidation and heat-induced instability, hydrogenated lecithin offers enhanced stability. Formulating with lecithin as a primary emulsifier often necessitates significant heat and high shear to achieve stable emulsions. Its inherent nutty scent and deep caramel hue may influence the final product's sensory and visual attributes.

Synergies

  • Oils
  • Oil-based products
  • Oil-soluble actives (e.g., Vitamin A, Vitamin E)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
50%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed lecithin's safety, along with other phosphoglycerides, for use in cosmetics at concentrations up to 50%. This update in 2015 resolved prior concerns from a 2001 report regarding N-nitroso compound formation and the 15% concentration limit. The FDA also deems various lecithin forms as Generally Recognized As Safe (GRAS) for food; however, animal-derived lecithin from bovine specified risk materials is prohibited in cosmetic applications.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Lecithin is a highly valuable, multifaceted ingredient that enhances skin hydration, strengthens the barrier, and significantly improves the delivery of other active compounds.

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References

Sources