labs such as Calorify and Energy Metabolism Laboratory provide testing services

Calorify is a health technology company that provides precise metabolic testing services using the Doubly Labeled Water (DLW) method. Considered the gold standard in metabolic science, the company's mail-in kits allow users to measure their total daily energy expenditure and body composition with high accuracy in real-world conditions. Calorify serves elite athletes, clinical researchers, and health-conscious individuals by providing data-driven insights into caloric needs and metabolic health. The company aims to make advanced metabolic tracking, previously restricted to research settings, accessible to the broader public.