Liquid Soap Formula for Sensitive Skin

Based on your requirements for a gentle, moisturizing liquid soap with medium foam and a light fragrance, suitable for sensitive skin exposed to sun, we recommend using Sulfate Free Shampoo Base as the foundation. This base is known for its mildness.

To achieve the desired properties, you can incorporate the following ingredients:

• Sulfate Free Shampoo Base (Product ID: 1107): This serves as the primary cleansing base. It is sulfate-free and gentle, making it suitable for sensitive skin.
• Cocamidopropyl Betaine (Product ID: 160): Acts as a co-surfactant. It helps boost foam, makes the foam softer, and reduces potential irritation from the main surfactant, enhancing the overall mildness of the formula.
• Glycerin (Product ID: 143) or Sodium PCA 50% (Product ID: 156): These are humectants that attract and retain moisture in the skin. Adding them helps prevent dryness after washing, leaving the skin feeling hydrated and slightly slippery.
• Hydroxyethyl Cellulose (HEC) (Product ID: 7461): A thickener used to adjust the viscosity of the liquid soap to a desirable consistency.
• Preservative (e.g., Mild Preserved™ COS (Product ID: 33939) or NaturePreserve™ Ultra (Product ID: 520)): Essential for preventing microbial growth and ensuring the product's safety and shelf life. Choose a gentle, broad-spectrum preservative suitable for rinse-off products.
• Fragrance: Add a cosmetic-grade fragrance of your choice at a low concentration for a light scent.

Sample Formula Structure:

• Sulfate Free Shampoo Base: 60-80%
• Cocamidopropyl Betaine: 5-15%
• Glycerin or Sodium PCA 50%: 1-5%
• Hydroxyethyl Cellulose (HEC): 0.5-2% (Adjust as needed for desired thickness)
• Preservative: According to manufacturer's recommended usage rate
• Fragrance: 0.1-0.5%
• Purified Water: Balance to 100%

Basic Mixing Instructions:

1. Combine Sulfate Free Shampoo Base, Cocamidopropyl Betaine, and a portion of the purified water. Stir gently to mix (avoid vigorous stirring to minimize bubbles).
2. Add Glycerin or Sodium PCA 50% and the preservative. Stir until well combined.
3. Slowly add Hydroxyethyl Cellulose (HEC) that has been properly dispersed or dissolved in water (follow the supplier's instructions for HEC). Stir continuously until the mixture thickens to the desired consistency.
4. Add the fragrance and stir gently.
5. Adjust the final viscosity with purified water if necessary.
6. Check and adjust the pH to be skin-friendly (typically pH 5.5-6.5) using a small amount of Citric Acid solution if needed.

Important Notes:

• Always perform a small test batch before making a large quantity.
• Adjust ingredient percentages based on your testing to achieve the desired foam, feel, and viscosity.
• Ensure all equipment is clean and sanitized.
• Perform a challenge test on your final formula to confirm the effectiveness of the preservative before selling the product.

This formula provides a good starting point for creating a gentle, moisturizing liquid soap suitable for sensitive skin.