Science
Mechanism of Action
This ingredient, along with its salts, operates as an amphoteric surfactant and cleansing agent. Its unique structure, containing both acidic and basic groups, enables it to lower the surface tension of liquids, facilitating the mixing of oil and water. This action efficiently lifts dirt, oils, and other impurities from the skin and hair. Furthermore, it acts as an emulsifier, essential for maintaining the stability of oil and water mixtures within cosmetic formulations. Some evidence suggests it may contribute to skin soothing, reduction of redness, and accelerated recovery, making it potentially beneficial for delicate and blemish-prone complexions.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 A human repeat insult patch test (HRIPT) involving sodium lauriminodipropionate demonstrated no instances of contact sensitization.
- 02 A shampoo containing sodium lauriminodipropionate at this concentration did not induce delayed contact hypersensitivity.
- 03 A hair dye formulation incorporating disodium lauriminodipropionate showed no systemic adverse effects in rabbit studies over a 13-week period.
- 04 A 91-day rabbit study indicated that sodium lauriminodipropionate at this concentration acted as a dermal irritant, though without systemic toxicity.
Transparency
Dusting Analysis
As a surfactant and cleansing agent, Lauriminodipropionic Acid is typically incorporated at functional concentrations and is not commonly associated with 'dusting' concerns relevant to highly potent actives at trace amounts.
The Formula
Formulation
Stability
Lauriminodipropionic Acid's form varies with pH, existing as anionic or cationic. Surfactants generally perform optimally within a pH range of 5–8 and can undergo hydrolysis in solutions with strong alkalinity, specifically above pH 8.5.
Conflicts
- Strongly alkaline solutions (>pH 8.5)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Lauriminodipropionic Acid and its associated salts (sodium and disodium lauriminodipropionate) safe for use in cosmetics under current practices and concentrations. While no maximum concentration is explicitly stated for the acid itself across all cosmetic applications, sodium lauriminodipropionate has shown dermal irritancy at a high concentration of 10.5% in rabbit studies. Conversely, human studies at 2.2% and 3.5% for sodium lauriminodipropionate demonstrated no contact sensitization or delayed hypersensitivity. The FDA's VCRP lists its salts in various formulations, including hair conditioners and face/neck preparations. No SCCS assessment has been identified.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Lauriminodipropionic Acid is a valuable ingredient, serving as a versatile and generally well-tolerated amphoteric surfactant and emulsifier, suitable for various skin types, including sensitive and acne-prone.
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References
Sources