What is a way to measure to caffeine?

Caffeine content can be measured using high-performance liquid chromatography (HPLC), a laboratory technique that separates and quantifies compounds in a sample. Alternatively, you can estimate caffeine levels in beverages by referring to standard databases or nutritional information that list caffeine content for common drinks, such as coffee, tea, and energy drinks. Additionally, some home testing kits are available that can provide an approximate measurement of caffeine in specific products.