Cosmetics and personal care products are perfect environments for microorganisms to grow unless proper measures are taken during formulation and manufacture to preserve them.
Preservative challenge testing is a fast and easy way to learn about the efficacy of your preservative system.
Preservation of cosmetic products is important to ensuring their safety and shelf stability. Luckily, formulators of cosmetics have a number of time-tested preservatives to choose from. The list of preservatives below are commonly used in cosmetic products.
Dermal Irritation - reversible skin damage that occurs as a result of applying a particular substance to the skin and appears shortly after application of the substance.
Customers often ask Cosmetic Test Labs questions about the choice between natural and synthetic preservatives. Choosing whether to use natural or synthetic preservatives for cosmetics is an important decision that has many implications. It will affect product stability, odor , appearance, texture and most importantly, safety.
For Category 1 Products
Bacteria: No less than 1.0 log reduction for the initial calculated count at 7 days, not less than 3.0 log reduction at 14 days, and no increase from the 14 days' count at 28 days.
For each micro-organism, the log reduction is compared to criteria A or B (see below).
a) If all the reduction values comply with criteria A below, the formulation satisfies requirement of the preservation efficacy test and, in accordance meets the requirements of this International Standard.