Using Mild Preserved in Serums with Natural Extracts

Mild Preserved SC10™, which contains Ethylhexylglycerin and Caprylyl Glycol, is effective against bacteria and helps control their growth. However, based on the product description, it is primarily noted for its antibacterial properties and is not classified as a broad-spectrum preservative that explicitly covers fungi (mold and yeast) when used alone.

Serums containing natural extracts are more susceptible to microbial contamination, including fungi. Therefore, relying solely on Mild Preserved SC10™ might not provide sufficient protection against all types of microorganisms, particularly fungi.

For broad-spectrum preservation in a serum with natural extracts, especially to ensure protection against fungi, consider the following options:

• Use a broad-spectrum preservative: Mild Preserved™ COS, which contains Phenoxyethanol, Chlorphenesin, and Caprylyl Glycol, is described as a broad-spectrum preservative effective against bacteria, yeast, and mold. It is water-soluble and works well in a pH range of 2-8, making it suitable for many serum formulations.
• Combine preservatives: You could potentially combine Mild Preserved SC10™ with another preservative known to be effective against fungi, such as Sodium Benzoate or Zinc-Ben (which contains Sodium Benzoate and Zinc Acetate). Sodium Benzoate is effective against fungi, but its efficacy is highly dependent on the pH of the formulation (typically most effective below pH 5). Zinc-Ben is also described as a broad-spectrum preservative effective in a pH range of 3-8.

Important Considerations:

• Challenge Testing: Regardless of the preservative or combination you choose, it is crucial to perform challenge testing on your final serum formulation. This test will confirm whether the chosen preservation system is effective at preventing the growth of bacteria, yeast, and mold under realistic conditions.
• pH Level: Ensure the pH of your serum is within the effective range for the preservative(s) you choose. Mild Preserved SC10™ works in formulas with a pH not exceeding 12, while Mild Preserved™ COS works in the pH range of 2-8, and Zinc-Ben in the pH range of 3-8.

In summary, while Mild Preserved SC10™ is a good antibacterial agent, for comprehensive protection against bacteria and fungi in a serum with natural extracts, using a broad-spectrum preservative like Mild Preserved™ COS or a combination including a fungal inhibitor like Sodium Benzoate (considering pH) or Zinc-Ben is recommended. Always validate the effectiveness with challenge testing.