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Does Dipeptide-2 target dark circles and other skin issues in cosmetics?
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Product Description
1、MOA - Mechanism of Action
Dipeptide-2 is a bioactive dipeptide that functions through a sophisticated, neuro-physiological pathway:
Enkephalinase Inhibition: Its primary mechanism is the inhibition of the enzyme enkephalinase.
Enkephalin Potentiation: Enkephalinase is responsible for the degradation of endogenous enkephalins, which are neuropeptides with opioid-like activity. By inhibiting this enzyme, Dipeptide-2 increases the local concentration and prolongs the activity of enkephalins.
Stimulation of Lymphatic Contractility: Enkephalins bind to delta-opioid receptors present on lymphatic endothelial cells. This binding triggers a calcium-dependent signaling cascade that enhances the contractility of lymphatic vessels.
Enhanced Drainage: The increased contractility accelerates the removal of stagnant lymph fluid, metabolic waste, and accumulated proteins from the interstitial tissue. This process is crucial for reducing edema and improving microcirculation, particularly in the delicate periorbital area.
In summary: Dipeptide-2 → Inhibits Enkephalinase → Increases Enkephalins → Stimulates Lymphatic Vessel Contraction → Boosts Drainage → Reduces Puffiness & Dark Circles.
2. In Vitro Efficacy Data
Enkephalinase Inhibition Assay: In vitro studies demonstrate that Dipeptide-2 effectively inhibits enkephalinase activity in a dose-dependent manner, confirming its proposed mechanism of action.
Lymphatic Endothelial Cell Model: Tests on human lymphatic endothelial cells show that treatment with Dipeptide-2 leads to:
a. Increased phosphorylation of key proteins involved in muscle contraction.
b. Enhanced rhythmic contractions of the cells, mimicking the pumping action of lymphatic vessels.
c. Improved clearance of fluorescently-labeled tracers in capillary-like tube formation assays, quantitatively demonstrating accelerated drainage.
3. Clinical Results
Study: Reduction of Periorbital Puffiness and Dark Circles
a. Design: Double-blind, placebo-controlled study on female volunteers with noticeable under-eye puffiness.
b. Formula: A gel containing 0.05% Dipeptide-2 applied twice daily for 28 days.
c. Results (Instrumental & Clinical Evaluation):
*Significant Reduction in Puffiness: Up to 70% reduction in under-eye puffiness volume, as measured by 3D topographic analysis ( fringe projection).
*Diminished Dark Circles: Clinical grading showed a significant improvement in the appearance of dark circles, with a reduction in color intensity and surface area.
*Improved Skin Firmness: An increase in skin firmness and elasticity was observed in the treated area.
*High Subject Satisfaction: The majority of participants reported a visible reduction in bags under the eyes and a more refreshed, less tired appearance.
Safety Profile
Dipeptide-2 is a synthetic peptide composed of two natural amino acids. It is designed to be safe for topical application.
Skin Irritation Test: Studies have shown it to be non-irritating and well-tolerated, even by the sensitive skin of the eye contour area.
Non-cytotoxic: In vitro tests confirm no cytotoxicity at recommended use concentrations.
Skin Irritation Test: Studies have shown it to be non-irritating and well-tolerated, even by the sensitive skin of the eye contour area.
Non-cytotoxic: In vitro tests confirm no cytotoxicity at recommended use concentrations.
Compatibility & Formulation Guidelines
Solubility: Soluble in water.
PH Stability: Stable in a wide pH range (typically 4.0 - 8.0). Always verify stability in the final formulation.
Temperature: Incorporate at temperatures below 45°C to maintain peptide integrity. Compatibility: Compatible with most common cosmetic ingredients. Avoid strong oxidizing or reducing agents.
PH Stability: Stable in a wide pH range (typically 4.0 - 8.0). Always verify stability in the final formulation.
Temperature: Incorporate at temperatures below 45°C to maintain peptide integrity. Compatibility: Compatible with most common cosmetic ingredients. Avoid strong oxidizing or reducing agents.
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Recommended Dosage & Formulation
Recommended Concentration: 0.05% - 0.5% in the final product. It is highly effective at low concentrations.
Ideal Product Forms:
a. Eye Serums (Anhydrous or aqueous)
b. Eye Creams and Gels
c. Anti-Fatigue Roll-Ons
d. Sheet Masks (especially for the eye area)
e. Contouring and Slimming Products for the face and body
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Precision-Targeted Mechanism
Uniquely acts on the enkephalin pathway to stimulate natural lymphatic drainage.
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Clinically Proven Efficacy
Significantly reduces under-eye puffiness (up to 70%) and diminishes the appearance of dark circles.
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Bio-Mimetic & High-Potency
Mimics the body's own signaling processes and delivers results at very low concentrations (as low as 0.05%).
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Safe & Well-Tolerated
Excellent safety profile, suitable for the sensitive eye contour area.
Storage
Store in a closed container at a dry place at room temperature.
Animal Testing
Not animal tested
Vegan
Does not contain animal-derived components
GMO
No data available