Is Insulin useful for Müdigkeit?

Insulin is a hormone primarily used to regulate blood glucose levels and is not indicated for general fatigue. Using insulin without a medical diagnosis (e.g., diabetes) can cause dangerous hypoglycemia. Fatigue has many causes—sleep deprivation, nutrient deficiencies, stress, or chronic illness. There is no scientific evidence that insulin is effective or safe for non-diabetic fatigue. The provided context (DNA tests, iron deficiency self-test) does not support any benefit of insulin for fatigue. Instead, one should investigate the root cause (e.g., check ferritin for iron deficiency) and apply evidence-based interventions. Claims that insulin helps with fatigue are speculative and potentially harmful.