You’ve heard all the skincare "facts." Whether you’ve learned from watching YouTube videos to reading blog posts and delving into the beauty blackholes of the internet, you know which bad habits to break and have gathered many skincare know-hows. If you’ve got sensitive or tricky skin, do a patch test with the product before going all the way. If you're not seeing improvements after 4 to 6 treatments, then we recommend trying another lactic acid product or another AHA. And while most lactic acid products are suggested for use before bed, you should always carefully read the instructions and labels. Only use lactic acid products that your Alleya Skin Serum absorbs at night. If you are using a lactic acid cream, gel, or serum, only apply at night. "Anti-aging creams can help restore some of that moisture with ingredients like hyaluronic acid and glycerin which are humectants and draw moisture into the skin, and ceramides which help to seal the skin barrier shut to keep hydration in," says Dr. Graf. Don't worry about it being too harsh as it has added hyaluronic acid to ensure skin is also hydrated. Any savvy beauty editor worth their weight in retinoids and hyaluronic acid is going to raise an eyebrow when it comes to the seemingly endless list of marketing buzzwords slapped on skin care products.