Detailed answer

Using a serum once or twice daily is usually sufficient to reap the benefits. Serums are highly concentrated formulations that deliver active ingredients deep into the skin. The frequency of use can depend on your specific skincare needs and the formulation of the serum. If you have sensitive skin or are using a stronger serum with potent ingredients, it's advisable to start with once-a-day application and gradually increase if your skin tolerates it. Always follow the instructions provided by the product and consult with a skincare professional if you are unsure.