As a nephrologist, I frequently see patients with kidney stones, and one finding that appears with striking regularity on metabolic evaluations is hypocitraturia, defined as urine citrate <320 mg/day. In large-scale urine studies, hypocitraturia is now the third most common metabolic abnormality in stone formers, surpassed only by high urine calcium (>250mg/day) and low urine volume (< 2 L/day), significant risk factors for kidney stone formation (1). Over the past two decade