It is generally recommended to consult with a healthcare professional before taking any natural products, especially if you are using hormonal contraceptives like Marvelon. This is because certain supplements may interact with medications or affect their effectiveness. It is important to ensure that the dosage is appropriate and that any potential side effects are monitored. Therefore, it is advisable to discuss your intention to take a supplement with your doctor or pharmacist to determine the best approach for your individual health needs.