K-Mag Aspartate Source Naturals, Inc. 60 Tabs

What the brand says

Source Naturals uses extremely high quality potassium and magnesium aspartate. Source Naturals K-Mag Aspartate is an excellent source of energizing nutrition for athletic activity or fast-paced daily living. Potassium is essential for nerve function, muscle strength, and glycogen formation, among other biochemical processes.