Additive manufacturing processes offer the opportunity to produce highly complex components with optimal material utilization. In the Laser Powder Bed Fusion process (L-PBF), metallic powder is melted layer by layer using laser radiation to create the final component. The application areas of these components range from fields with high design flexibility, such as medical technology, to lightweight applications in motorsports, and high-temperature applications in aerospace. Due to the high quality requirements in all these areas, it is crucial to understand the raw material. Within this study, statements regarding the effects of humid powder storage on powder properties and the properties of the finished component are to be analyzed. The examined materials are the titanium alloy Ti6Al4V and the austenitic stainless steel 316L. For the analysis, realistic environmental conditions were set to identify potential quality differences. The reuse of powder in industrial applications leads to additional changes in input parameters. Therefore, both fresh and reused so called ¿mixed¿ powders were analyzed. Due to the small particle size of the powder in the L-PBF process (under 60 µm), various analysis methods are available. In this study, several methods examining powder density, particle size distribution, and chemical composition were applied. In addition, tensile tests and density cubes were manufactured and tested to reveal differences in mechanical properties. The statements of this study aim to provide a fundamental understanding of the influences of powder storage and differences due to powder aging. Based on the conducted investigations, future decisions in powder management are intended to be made in a well-informed manner to meet the highest quality standards.