Could a daily iron pill boost energy in heart failure?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Chronic HF (New York Heart Association \[NYHA\] functional class II-IV) patients, on optimal therapy, and clinically stable for at least 4 weeks with no dose changes of HF drugs 2. LVEF\<50% at screening visit (historical value can be used if performed within 6 months of screening visit) 3. Either a documented hospitalization for HF in the previous 12 months of enrolment or an elevated NT-proBNP: ≥250 pg/mL (or BNP ≥75 pg/mL) for patients in normal sinus rhythm; ≥1,000 pg/mL (or BNP ≥400 pg/mL) for patients in atrial fibrillation 4. TSAT \<20% 5. Hemoglobin 10.0-16.0 g/dL 6. Rapid iron repletion with intravenous iron is not considered a clinical necessity by physicians after reviewing patient medical record (if anaemia is present, its grade is no more than mild) 7. Age ≥18 years, male and female 8. Willingness to provide informed consent 9. Subjects who decide to use single or dual contraceptive methods to avoid conceiving during the study period Exclusion Criteria: 1. Neuromuscular, orthopedic or other non-cardiac condition that prevents the patient from exercise testing 2. Exercise training program in the previous 3 months, or planned in the next 3 months 3. Recent (\<3 month) acute coronary syndrome, coronary artery bypass surgery, percutaneous coronary interventions, transient ischemic attack, or stroke 4. Severe valvular disease, hypertrophic obstructive cardiomyopathy, restrictive or constrictive cardiomyopathy, acute myocarditis 5. Atrial fibrillation or flutter with a ventricular response rate of \&gt;100 beats per minute at rest 6. Temperature ≤38 °C (oral or equivalent) or active infection as defined by current use of oral or intravenous antimicrobial agents 7. Need for blood transfusion within the last month 8. Hb\<10 g/dL or Hb\>16 g/dL 9. Rapid iron repletion with intravenous iron is considered a clinical necessity by physicians after reviewing patient medical record 10. Documented active gastrointestinal bleeding 11. Oral iron, i.v. iron or erythropoietin stimulating agent within the last 3 months 12. eGFR ≤15 mL/min or on hemodialysis 13. Chronic liver disease and/or alanine transaminase or aspartate transaminase above 3 times the upper limit of the normal range 14. Active cancer 15. Evidence of iron overload (ferritin \>400 ng/mL) 16. Hypersensitivity to any of the study products or known severe allergies 17. Participation in another study 18. Low body weight (≤35 kg) 19. Known or anticipated pregnancy in the next 4 months 20. Need for forbidden medications 21. Breastfeeding 22. Consumption of iron-rich foods or any food that alter iron absorption (i.e. food rich in vitamin C) due to dietary requirements 23. Any pathological condition or disease associated with a reduction or an impairment of intestinal iron absorption (i.e., prior gastrectomy, atrophic gastritis, bariatric surgery, coeliac disease)