Olay has sold 1 billion jars of this Drew Barrymore-approved cream, down to $21

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For many skin-care enthusiasts, finding that one staple item in your routine can take a lot of time, patience and money — especially when it comes to moisturizers. If you haven't given up on your search just yet, there's one face cream that is a must for shoppers, judging by the sales numbers: According to the brand, over 1 billion jars of the stuff have flown off the shelves. It's Olay's Regenerist Micro-Sculpting Cream, created to diminish fine lines and wrinkles. It's on sale for $21 (down from $27).

Ingredients like hyaluronic acid and niacinamide make this moisturizer a hydrating anti-aging favorite.

With double discounts courtesy of an additional on-page coupon, you can scoop up a jar of Olay Regenerist Micro-Sculpting Cream for $21 — a $6 savings from its original price. That's much more affordable than a trip to the dermatologist for in-office treatments!

Packed with all the essential ingredients to help hydrate, plump and firm your skin, this anti-aging formula is created with antioxidants, vitamin B3, amino-peptides and hyaluronic acid. Vitamin B3, also known as niacinamide, can help with cell turnover and regeneration, turning back the clock on visible signs of aging. Los Angeles-based dermatologist Tsippora Shainhouse recommends Olay Regenerist, and told NBC News that "it has the efficacy promised by expensive beauty-counter products."

The cream is not only backed by dermatologists — even megastars are fans too. Drew Barrymore said she's been "rocking Regenerist" for "12 to 15 years" in an Instagram video.

Drew isn't the only fan of Regenerist — more than 13,000 Amazon reviewers have given the cream a fresh-faced five-star rating.

"Love this cream. Helps fade spots and keeps my skin plumped. I even use it on the tops of my hands," shared one reviewer.

"I am on my second tub of this now!" wrote another user. "I use it every night before bed after washing my face. ... I love the way it feels on my skin. It is very moisturizing and I see a difference in the smoothness of my 42-year-old skin."

One beauty maven said, "I'm in my early 50s and I have the dry skin that is normal for someone my age. ... This is by far my favorite moisturizing cream but is expensive for a drugstore brand. I've tried many less expensive brands, but I keep going back to this one because I get the best results — plumping, less lines, glow. Overall, my face just looks and feels better." (Good thing it's on sale right now!)

"It makes my skin feel so soft; aging lines have already begun to disappear and it's only been two weeks," marveled a final fan. "I love the way it gives me that spa feeling without the spa expense."

"The only reason for four stars is that it sometimes rubs off in clumps during the day, especially if it's humid or I'm sweating a bit. I don't really enjoy that," confessed a shopper. "It is a bit thicker than my night moisturizer by Olay, maybe that's why. Outside of that, it moisturizes and makes my skin look and feel great."

"Well, after a few weeks, I noticed that the lines around my eyes looked much better," said another four-star fan. "My skin texture had also improved. Since I hadn't been using anything else, I knew it was this product. I'm now a fan and will buy more once this jar runs out. I only wish there was more product in the jar, hence the one-star deduction."

Yes, Virginia, there is an effective anti-aging product up for grabs at the drugstore.

If you have Amazon Prime, you'll get free shipping, of course. Not yet a member? No problem. You can sign up for your free 30-day trial here. (And by the way, those without Prime still get free shipping on orders of $35 or more.)

The reviews quoted above reflect the most recent versions at the time of publication.