Use and Perceived Helpfulness of Different Intervention Strategies in Myalgic Encephalomyelitis Chronic Fatigue Syndrome and Depression L Carnitina L Carnitina: qu es, para qu sirve y beneficios Endothelial dysfunction is common in both Long COVID and ME CFS and has been linked to symptoms like fatigue, chest pain, and brain fog. Research suggests that certain supplementslike L arginine, CoQ10, curcumin, and