Preservatives in Water-Based Formulations

Your formulation contains 75% water. Any cosmetic or personal care product that contains water is susceptible to microbial growth (bacteria, mold, and yeast). These microorganisms can contaminate the product, leading to spoilage, changes in texture, odor, and appearance, and potentially causing skin infections or irritation.

Preservatives are added to water-based formulations to inhibit the growth of these microorganisms, ensuring the product remains safe, stable, and effective throughout its shelf life.

Even though surfactants like AminoWash and BabyFoam are present, they do not provide sufficient preservation on their own against the wide range of potential contaminants in a water-based system.

Recommended Preservatives

Based on the available information, here are a few suitable preservatives you could consider for your formula:

• Mild Preserved Eco: This is a popular choice as it is not classified as a preservative under FDA regulations, allowing for "preservative-free" claims. It is effective in a pH range of 4-9 and is suitable for various product types.
• Thyme Care: A natural preservative extracted from Thyme and Bois De Rose. It provides broad-spectrum antimicrobial activity and can be used at a rate of 0.8%. It has a natural thyme scent.
• NaturePreserve Ultra: A natural preservative consisting of Gluconolactone and Sodium Benzoate. It is effective in a pH range of 3-6 and is suitable for cosmetic products.

Always perform a challenge test on your final formulation to ensure the chosen preservative is effective at the concentration used and suitable for your specific product.