This product contains Optiphen Plus Preservative for Cosmetics and Optiphen Natural Preservative for Lotions, Serums, and DIY formulations, each supplied in an 8-ounce (236 mL) bottle. Optiphen Plus is a paraben-free, formaldehyde-releasing agent-free broad-spectrum preservative system that includes phenoxyethanol, caprylyl glycol, and sorbic acid. It is designed to protect oil-in-water emulsions, creams, lotions, and water-based cosmetic products from microbial contamination. Optiphen Natural is a naturally derived preservative blend that provides broad-spectrum antimicrobial efficacy suitable for lotions, serums, and other water-phase formulations. Both preservatives function effectively across a pH range of 4 to 8 and do not alter the viscosity or sensory properties of the final product. They are soluble in water and can be added during the cool-down phase of manufacturing, making them compatible with both hot-process and cold-process production methods. The recommended usage rate is 1 to 2 percent of the total formulation weight. These preservatives help maintain product stability during storage and use without requiring special handling equipment. The 8-ounce size is practical for small-batch production, hobbyist formulators, and those developing personal care items at home. These products are not intended for use in eye-area products or formulations intended for direct mucous membrane contact without appropriate safety evaluation. Concentration adjustments may be necessary based on formulation composition and preservative challenge testing results. These preservatives are compatible with a wide range of cosmetic ingredients, including oils, butters, and botanical extracts.