Hi Rita, thank you for your Qualia Senolytic review. We are sorry to hear the product did not work for your biochemistry. Yes, a person may experience light headaches, lack of energy, slight irritability, gastrointestinal disturbances, or other mildly unpleasant symptoms when taking Qualia Senolytic. Our system shows you've reached out to Customer Support, and they have refunded you for your Senolytic purchase.