Inclusion Criteria:  Ejection fraction <40% minimum 1 month. No change in optimum treatment 1 month at least.  Exclusion Criteria:  Ischemic cardiopathy (Angio-tomography corroborated cut-point >50% obstruction, coronary angiography, or cardiac scintigraphy 6 months at least) or angina pectoris symptoms. Reynaud syndrome Metformin or SGLT-2 Inhibitors treatment, Low BMI, nutritional deficiencies. Creatinin clearance <30ml/min or renal replacement therapy MRI contraindications (prothesis, Unsupported pacemakers, claustrophobia, etc) Reynaud phenomenon history