Detailed answer

Caffeine in skincare products is primarily used for its potential to reduce puffiness and improve blood circulation. However, the effectiveness of caffeine in moisturizers is debated, and there is limited scientific evidence supporting its benefits. While caffeine may provide a temporary tightening effect, other well-researched ingredients like hyaluronic acid, glycerin, and ceramides are more effective for moisturizing and improving skin hydration. If caffeine is an ingredient you enjoy in skincare products, consider using it in a separate product such as an eye cream or serum for targeted benefits.