Artificial Cerebrospinal Fluid (ACSF) is an essential buffer solution widely used in electrophysiology experiments, particularly to keep acute brain slices alive during research. This solution closely mimics the natural cerebrospinal fluid found in the brain and is designed to maintain neuronal viability and function during experiments like patch-clamp recordings. In this article, we’ll explore the importance of ACSF, its composition, and practical tips to optimize its use.