Preservative usage in low-water formula (4% water) - Phenoxyethanol concentration
Question
Should a preservative be used in a formula with only 4% water? If yes, is 0.04% Phenoxyethanol sufficient (calculated as 1% of the water content)?
Answer
Yes, even with only 4% water in the formula, it is generally recommended to include a preservative, especially if the product is intended for commercial sale.
For commercial production, the staff recommends using a preservative at a concentration of at least 0.5% of the total formula to ensure long-term stability and protection against potential contamination during storage and use.
For personal use, the calculated amount of 0.04% Phenoxyethanol (which is 1% of the water content) is considered acceptable. The staff suggests preparing the water phase with 1% Phenoxyethanol for easier measurement in this case.
Therefore, while 0.04% Phenoxyethanol might be sufficient for personal use according to the staff, a higher concentration (at least 0.5% of the total formula) is advised for products intended for sale to ensure adequate preservation over time.
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