Science
Mechanism of Action
Milk proteins exert their beneficial effects by reinforcing the skin's natural barrier function, thereby enhancing moisture retention and mitigating transepidermal water loss. Bioactive peptides derived from milk proteins demonstrate significant antioxidant and antimicrobial activity, contributing to the reduction of acne lesions, regulation of sebum secretion, and amelioration of inflammatory conditions. Specific components like lactoferrin exhibit broad-spectrum antimicrobial action through iron chelation, while lactoperoxidase functions as a natural antibacterial agent. Immunoglobulins help to prevent pathogen adhesion and neutralize toxins. Furthermore, hydrolyzed forms facilitate cellular restructuring and create a protective film, ensuring sustained hydration and aiding in gentle cleansing by binding to impurities.
Research
Clinical Evidence
High confidence0.5%
Key findings
- 01 Whey Protein, a milk protein derivative, at 0.5% concentration, demonstrated reduced wrinkles and improved skin firmness within two weeks during in-vivo testing.
- 02 A cosmetic preparation containing 15% lyophilisate of sheep colostrum significantly improved wound healing for difficult-to-treat conditions like buttock erythematosus and erosion erythema, leading to complete skin regeneration for seborrheic acne.
- 03 Soap formulated with 5% Podolian cow milk exhibited effective cleansing and antibacterial properties, reducing bacterial hand contamination by 98%.
- 04 Hydrolyzed Milk Protein, found in leave-on products within this concentration range, functions as a skin and hair conditioning agent, supporting cell restructuring and maintaining hydration.
Transparency
Dusting Analysis
Milk Protein is an umbrella term encompassing various derivatives, each with distinct maximum usage concentrations depending on the specific derivative and product application. For example, Casein is used at up to 2% in makeup, and Sodium Caseinate at up to 96.9% in bath products that are diluted prior to use. However, the highest reported maximum concentration for Hydrolyzed Milk Protein, a common form found in leave-on face and neck skincare products, is 0.1%. Consequently, if a leave-on product claims a 'Milk Protein' concentration exceeding this 0.1% threshold without specifying a different derivative with a higher approved limit for that application, it may indicate a potential misrepresentation of the active ingredient's concentration or form.
The Formula
Formulation
Stability
Hydrolyzed milk protein maintains stability within a pH range of 4.0 to 7.0. However, specific components like immunoglobulins are thermolabile, sustaining damage at 100°C for 30 seconds, yet retaining their active properties during mild pasteurization (72°C for 15 seconds). Beta-Lactoglobulin's ability to bind substances is diminished when heated to 70-80°C. The overall stability of milk proteins is influenced by factors such as heating temperature, duration, shear forces, pH, and the relative abundance of proteins and minerals; fragmentation of protein aggregates has been observed at pH 6.8 under heat and shear.
Safety
Safety Profile
The CIR Expert Panel has concluded that 16 bovine milk proteins and protein-derived ingredients, including Milk Protein and Hydrolyzed Milk Protein, are safe in their current cosmetic uses and concentrations. These ingredients are also recognized as safe by the U.S. FDA for food applications. Animal and human studies have reported no dermal or ocular irritation or sensitization, nor any Type I immediate hypersensitivity reactions from cosmetic use. Systemic exposure from dietary intake far surpasses that from cosmetic products. While generally safe for adult use, the SCCS advises against incorporating food proteins or protein-rich ingredients like milk powder into cosmetic products for children under two years of age who have not yet established oral tolerance, due to a potential risk of skin sensitization. The 0.1% maximum concentration specifically refers to Hydrolyzed Milk Protein in leave-on formulations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Milk Protein is a valuable, multi-functional ingredient providing significant benefits across all skin types, including enhanced hydration, barrier support, and anti-aging effects, with a strong safety profile for adult use.
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References
Sources