Preservative Coverage Comparison: Paeonia Preserve vs. Phenoxyethanol SA

When comparing Paeonia Preserve and Phenoxyethanol SA (often known as Optiphen Plus) for broad-spectrum coverage in an acidic gel product like one based on vinegar, here's a breakdown:

• Phenoxyethanol SA (Optiphen Plus): This preservative is explicitly described as a very safe, broad-spectrum preservative offering "Broad protection". Its composition, which includes Phenoxyethanol, Caprylyl Glycol, and Sorbic Acid, contributes to its higher efficiency, particularly in controlling fungi, enhancing its broad-spectrum activity. It is suitable for formulations with a pH between 2.0 and 6.0, which aligns well with an acidic, vinegar-based product.

• Paeonia Preserve: This natural preservative is described as effective in controlling infection in cosmetic formulations and can be used as a single preservative. It is soluble in water and contains Ethyl alcohol. While effective, the description does not explicitly state "broad-spectrum" in the same context as Phenoxyethanol SA, nor does it specify a suitable pH range.

Based on the available information, Phenoxyethanol SA (Optiphen Plus) appears to offer broader coverage, especially against fungi, and is specifically noted as suitable for the acidic pH range (2.0-6.0) relevant to a vinegar-based product. Paeonia Preserve is effective, but its broad-spectrum claim is less defined in the description, and its water solubility might be a factor to consider in a low-water formulation (although vinegar itself is mostly water).

Ultimately, the most effective preservative for your specific gel formulation can only be confirmed through a challenge test to ensure it adequately protects against microbial growth in your unique product matrix.