Citric acid is a natural substance found in citrus fruits like lemons and oranges. It is a sour-tasting chemical that is often used as a food additive to give a tart flavor to drinks or preserve foods. Full definition
Magnesium citrate — Magnesium mixed with citric acid in a 1:1 ratio. (supernutritionlife.com)
As discussed by Robergs and Roberts [22], amino acid catabolism during exercise is important for three reasons: 1) for free energy during exercise to fuel muscle contraction; 2) to increase concentrations of citric acid cycle intermediates and therefore support carbohydrate and lipid catabolism; and 3) to serve as gluconeogenic precursors. (jissn.biomedcentral.com)
This natural remedy is a good line of defense against increased reactive oxygen species and free radicals due to the presence of citric acid in lemon juice. (detoxdiy.com)