Here are some tips for layering highly concentrated ampoules to give you a radiant complexion, along with a question about ingredient combinations. On days when my skin looks particularly dull and lackluster, I apply a thin layer of highly concentrated functional ampoule several times, rather than applying a large amount all at once. This method definitely improves absorption and creates a radiant complexion. Specifically, immediately after washing my face, I smooth my skin with a light, watery toner. Then, I apply a small amount of the hydrating ampoule and pat it all over my face until absorbed. Repeat this process about three times. This method creates a plump, glowing complexion from within, and is a valuable home care tip that I often recommend to friends and acquaintances. For those who have noticed their skin looking dull and makeup not going on well, expensive sheet masks are definitely an option, but if you diligently apply a basic ampoule at home, I'm confident you'll notice a noticeably smoother complexion the next morning. However, if the products don't blend well when layering, the product may pile up. If anyone knows whether mixing vitamins and moisturizers is safe for the skin or whether it's better to avoid certain ingredients, I'd like to hear a clear explanation about this. I'm also curious about your nightly routine to help your skin regenerate, and if you have any effective layering combinations other than the one I use, I would appreciate your recommendations. I want to achieve the same effect as a dermatologist's treatment with just my basic skincare routine, but I lack knowledge of ingredients, so I desperately need your help.