PSI Cosmetology Practice Exam

The best reference for product usage instructions is the manufacturer's instructions. These instructions are formulated based on thorough research and testing, ensuring that the guidance provided is specific to the product's formulation and intended use. Following the manufacturer's instructions ensures that users apply the product as designed, maximizing effectiveness and minimizing the risk of adverse reactions. Manufacturer's guidelines typically include information about appropriate usage amounts, application methods, potential side effects, and safety precautions. This official documentation is essential for achieving the best results and maintaining client safety. In contrast, relying solely on personal experience, online tutorials, or peer recommendations can lead to varied outcomes, as these sources may not account for the unique characteristics of each product or individual skin and hair types.