Study of the Administration of a Food Supplement in Patients With Lithiasis Treated With Extracorporeal Shock Wave Lithotripsy.

Inclusion Criteria: * Renal lithiasis with high radiological and clinical suspicion of calcium oxalate or calcium phosphate, size of the largest diameter between 1.5x1cm and 2x1cm, which will be treated by ESWL, being symptomatic with little probability of spontaneous expulsion. * Signed informed consent to participate in the clinical study. Exclusion Criteria: * Lithiasis of more than 20 mm and less than 15 mm for the largest diameter. * Taking medications with influence on urinary lithogenesis (citrate, bicarbonate, thiazides, bisphosphonates, magnesium, calcium, vitamin B6, vitamin D, vitamin A, xanthine-oxidase inhibitors, uricosurics, probiotics, urease inhibitors, cystine binders, topiramate , antiretrovirals). * Taking medications that influence urine pH (citrate, bicarbonate, carbonic anhydrase inhibitors, L-methionine, vitamin C, ammonium chloride). * Taking selective serotonin reuptake inhibitor antidepressant medications. * Taking anticoagulants and antiaggregants. * ESWL contraindications: urine infection, active or recurrent; hemorrhagic diathesis; pregnant or lactating patients; others (extreme obesity, arterial aneurysm near the location of the stone, etc.).