HB Set Tablet (Folic Acid 1.5 mg + Iron 100 mg) is mainly used to treat or prevent iron deficiency anaemia. Dark circles are typically caused by factors such as a lack of sleep, stress, genetics, allergies, or skin thinning, but they may also be linked to anaemia or nutritional deficiencies. If dark circles are due to iron or folate deficiency, this tablet may help improve them over time; however, if other reasons cause them, iron and folic acid alone will not make a significant difference. It is best to identify the exact cause of your dark circles with a doctor before starting supplements.