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When I first learned what hyaluronic acid was, I didn't give it near the appropriate amount of props. Now, I'm humble and happy to say that this one ingredient has literally whipped my skin into shape—thanks to a drugstore serum that's since become the number one selling serum in America.

I've been using L'Oréal's RevitaLift 1.5% Pure Hyaluronic Acid Serum for a year now, and it has officially cracked the highest level of my skin-care routine: holy grail. Whenever my stash is starting to run low, pure anxiety has me screeching my way to the closest CVS, sweat beading on the upper lip.

Part of the brand's dermatologist-validated Derm Intensives line, the serum blends two types of hyaluronic acid—low weight and high weight—to secure a potent 1.5% blend that makes major moves in both the hydration and antiaging departments. (It's also made without synthetic dye, mineral oil, fragrance, or parabens, which is a perk for sensitive skin types like mine.) As for benefits, it addresses a whole host of woes at once.

Dry skin? Hyaluronic acid holds over 1,000 times its weight in water. Done. Signs of aging? The powerhouse ingredient plumps your skin up something fierce, making fine lines appear diminished almost instantly, all while keeping future fine lines and wrinkles at bay. Presto. Dull complexion? Try not to feel dewy once you combine this serum with a glowy foundation. Boom. (Charlotte Tilbury Airbrush Flawless if you want to feel like a new woman.)

After a week or two of regular use, you'll start noticing how much more hydrated your skin looks and feels—that's the baseline perk. After two weeks of continuous use, you're expected to notice that the appearance of fine lines has diminished. For me, that means my skin looks plump and more awake, and it's definitely noticeable. Layered with my trusty age-defying foundation Chantecaille Future Skin Gel Foundation, it can't be beat.

Incorporating this serum into your own routine is simple. Use it after any active ingredients like salicylic acid or vitamin C and then layer with a more robust moisturizer to lock it all in. It says to use two to three drops, but I've translated that to at least half a dropper, if not more. The extra dose has me hooked.

If you've never used a hyaluronic acid serum before, lucky you. Things are about to get plump and dewy up in here—and you won't have to make an emergency CVS run anytime soon, thanks to this bottle on a budget. (Shop It: $28.30; amazon.com)

My love story with hyaluronic acid might not be over, but for now I'm in a committed relationship.