The best time to use the BOOMDEAHDAH Premium 4GF Ampoule is typically in the evening as part of your nighttime skincare routine. This allows the active ingredients to work while you sleep, maximizing their benefits. It is recommended to apply the ampoule after cleansing and toning, but before applying moisturizer and other treatments. This ensures that the skin is clean and prepped to absorb the product effectively.

Since there are no available reviews for this product, the above recommendation is based on general skincare practices and the typical use of ampoules. For specific advice, it would be beneficial to consult with a skincare professional or wait for user reviews to become available.