Lack of energy is a common complaint. Often, the lack of energy is transient or can be attributed to a definable organic illness. Some patients present with persistent and disabling energy deficiency, but show no abnormalities on physical examination or screening laboratory tests. In these cases, the diagnosis of chronic fatigue syndrome (CFS) should be considered. CFS is characterized by debilitating fatigue with associated muscle aches, tender lymph nodes, joint pain, chills, feverish feelings, and postexertional malaise. Diagnosis of CFS is primarily by exclusion with no definitive laboratory test or physical findings. Medical research continues to examine the many possible etiologic agents for CFS (infectious, immunologic, neurologic, and psychiatric), but the answer remains elusive. It is known that CFS is a heterogeneous disorder possibly involving an interaction of biologic systems. Similarities with fibromyalgia exist and concomitant illnesses include irritable bowel syndrome, depression, and headaches. Therefore, treatment of CFS may be variable and should be tailored to each patient. Therapy should include exercise, diet, good sleep hygiene, antidepressants, and other medications.
   Lack of energy may be due to depression, lack of exercise, poor diet with lack of adequate protein, anemia, diabetes, hepatitis, thyroid disorders, malignancy, occult infections, autoimmune disorders, sleep apnea, or adrenal insufficiency.
   If a full medical evaluation is completed and no major causes are found, certain supplements may be tried to increase energy levels.

Supplements that increase energy levels
Vitamin-B-Coenzyme can help with energy
Carnitine 500 is a good, steady energy enhancer
Pantethine provides steady energy all day, Some people notice improved eyesight with pantethine.
Maca is an energy herb from South America
Spirulina is popular for energy improvement

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