This study aims to evaluate the impact of a non-pharmacological treatment (nutritional therapy and pulmonary rehabilitation) on endothelial function, body composition, and physical functionality in recovered COVID-19 patients. The primary research question is: What is the effect of a non-pharmacological treatment (nutritional therapy and pulmonary rehabilitation) on endothelial function, body composition, and physical capacity in recovered COVID-19 patients, compared to those receiving conventional medical management? A nutritional treatment combined with L-citrulline supplementation (intervention group) will be compared against conventional treatment alone (control group). Both groups will undergo pulmonary rehabilitation for a 3-month follow-up. Subjects assigned to the intervention group will be required to: * Take 4 g of L-citrulline daily for 3 months. * Attend an interim session at 1.5 months for review of the nutritional treatment and supplementation. * Keep a record of each supplement intake.
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Endothelial disfunction markers
Timeframe: 3 months
Body composition
Timeframe: 3 months
Physical functionality
Timeframe: 3 months