While it is technically possible to use eyeshadow as lipstick, it is not recommended. Eyeshadows are specifically formulated for use on the delicate skin around the eyes and may contain ingredients that are not safe for ingestion or prolonged contact with the lips. Additionally, eyeshadows are typically not designed to adhere to the lips or provide the same level of comfort, longevity, or color payoff as lipsticks.
Using eyeshadow on the lips may result in a dry, uncomfortable texture, uneven application, and a lack of staying power. It's best to use products as intended and opt for lipsticks or lip makeup products specifically formulated for the lips to ensure safety, comfort, and your best results.