For almost 20 years, we have been using stable isotope tracer methods to study metabolism. Stable isotope tracers can be used to determine metabolite turn-over rates (i.e. lipolysis, glucose kinetics), body water content and total energy expenditure and furthermore to trace activity of metabolic pathways. We select the best stable iosotpe tracer method for your research question and support you in the study design. We can also conduct the clinical trial and we provide the necessary analytical methods, calculations and data analysis.