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Moumoujus

MILK.

Valuable CAS 8049-98-7 / SKIN CONDITIONING

Milk is a multi-functional ingredient revered for its comprehensive skin benefits, encompassing gentle exfoliation, deep hydration, and cellular regeneration. Rich in lactic acid, proteins, vitamins, and amino acids, it works to refine skin texture, enhance moisture retention, and fortify the skin's natural barrier, promoting overall skin health and resilience.

Summary

Moisturizer/Humectant Exfoliant Anti-acne Skin-soothing Antioxidant

Science

Mechanism of Action

Milk actively transforms skin through its diverse composition. Lactic acid, a gentle Alpha Hydroxy Acid (AHA), expertly exfoliates by dissolving dead skin cells and accelerating cell turnover, unveiling smoother, brighter skin. As a natural humectant, it simultaneously attracts and binds moisture, significantly boosting skin hydration. Key milk proteins like casein and lactoferrin are pivotal for stimulating cell renewal, enhancing elasticity, and promoting overall skin firmness. Lactoferrin further offers a spectrum of benefits, including antimicrobial, anti-inflammatory, and antioxidant actions, which are crucial for managing inflammation and protecting against environmental aggressors. Additionally, a complex of vitamins (A, B, D) and amino acids found in milk nourishes the epidermis, supports the skin's natural moisturizing factor (NMF), and helps maintain a balanced pH, contributing to resilient, healthy skin.

Research

Clinical Evidence

Medium confidence
Effective range 5–10%
Optimal

N/A

Key findings

  1. 01 Topical application of colostrum (first milk) was found to increase skin moisture, reduce transepidermal water loss (TEWL), and improve skin firmness in mature women over eight weeks.
  2. 02 Bovine colostrum at concentrations of 5% and 10% improved cell growth in a scratch wound assay on human keratinocyte HaCaT cell line, promoting migration and re-epithelialization.
  3. 03 Sheep milk products showed a 25% improvement in skin texture and a 20% reduction in hyperpigmentation after 8 weeks of use.

Transparency

Dusting Analysis

Not commonly dusted

Specific data on dusting analysis for milk as a cosmetic ingredient is not available in the provided research. Therefore, it is not currently identified as a commonly dusted ingredient.

The Formula

Formulation

Solubility
Both
Optimal pH 4.5 – 7
0 7 14

Stability

Milk is a complex emulsion containing both water-soluble (lactose, proteins, certain vitamins/minerals) and fat-soluble components (milk fat, some vitamins). Formulating with milk or its derivatives requires careful consideration of pre-treatments and extraction methods. Products may be prone to color changes, specifically yellowing, over time. Maintaining a precise pH within the range of 4.5 to 7.0 is critical for ensuring ingredient stability, optimal efficacy, and microbiological preservation. While lactic acid is most effective at lower pH values (e.g., 3.5+ for up to 10% concentration), overall milk-containing formulations have demonstrated stability in the 6.5-7.0 pH range, though cosmetic products typically aim for pH 4.5-5.5 to align with the skin's natural acid mantle for optimal compatibility and barrier function.

Conflicts

  • Ingredients highly sensitive to broad pH fluctuations, necessitating careful pH balancing.
  • Strong oxidizing agents, which may degrade active milk components.
  • High concentrations of certain preservatives, which could potentially diminish the skin-softening benefits of milk constituents.

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has not directly assessed 'MILK' as a whole ingredient. However, they have reviewed 'Milk Proteins and Protein Derivatives' (e.g., Hydrolyzed Milk Protein, Casein), concluding they are safe for cosmetic use. Reported maximum concentrations for derivatives in leave-on products include 0.1% for Hydrolyzed Milk Protein and up to 2% for Casein in makeup. While bovine milk proteins are recognized food allergens when ingested, the CIR found no reported cases of immediate hypersensitivity reactions from their cosmetic application. Individual sensitivities to dairy components like casein or lactose should still be considered for highly sensitive skin.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Milk is a versatile and valuable ingredient, offering scientifically supported benefits for hydration, gentle exfoliation, and skin barrier health, suitable for a broad range of skin types and cosmetic applications.

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