Every month in the Good Housekeeping Institute Beauty Lab, we put new and trusted beauty products, hair tools, and skin care products to the test and each month, our readers decide which items they want to spend their hard-earned cash on.

We saw a lot of beauty fads throughout 2019, like unicorn hair, microneedling, and even face yoga. But the stuff that readers really stocked up on were tried-and-true skin care products, like top-tested natural sunscreen to protect your skin from the sun's damaging rays, and anti-aging moisturizers and eye creams that wowed consumer testers and Beauty Lab scientists alike. Readers also couldn't get enough of amazing hair dryers that take the effort out of drying your own hair at home, including a cult-favorite hair dryer brush that cuts styling time in half, and a pricey hair dryer that's actually worth the cash.

What else our readers stocked up on might surprise you. Below are the 10 most popular beauty products of 2019, as chosen by our smart, savvy Good Housekeeping readers:

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MOST POPULAR HAIR TOOL

When wetested the Revlon One-Step Volumizer, we couldn't get enough and now, our readers can't either. Thanks to a smart, easy-to-use design, it combines the power of a hair dryer and the ease of a round brush in one simple step to cut your hair drying time in half (seriously). It has nearly 17,000 reviews on Amazon and right now, it's 35% off and will arrive before the holidays.

MOST POPULAR EYE CREAM

All throughout 2019, readers couldn't get enough ofthebest eye creamour BeautyLab has tested. It's a star in pretty much every arena: The formulaincreases skinfirmness and hydration by nearly 20%, reduces wrinkles by 10%,fades dark circles, and depuffs eyes.

MOST POPULAR TEETH WHITENER

For the pearliest whites, readers stocked up on thebest teeth whitening strips on the market.After 20 days of use, our Beauty Lab scientistsfound that these stripswhitened teeth two to four shades in just three weeks' time.Right now, they're 34% off,plus and additional $10 off that. All the more reason to smile.

MOST POPULAR SELF TANNER

$30.99

This Amazon reviewer-favorite is also our readers' pick for thebest self tanner of 2019. With over 5,000 reviews and an average 4.3 star rating, reviewers love that it doesn't have that telltale self-tanner-smell, and that the thicker consistency makes for more even application and natural-looking results. "I have been using this product since the summer and it made me seamlessly retain that glowing look no one noticed a difference," one person said.

MOST POPULAR HAIR DRYER

Yes, $400 is a lot to fork over for a hair dryer, but our Beauty Lab (and readers) say it's worth it for thebest hair dryer on the market.In our tests, theDyson Supersonic proved to have the fastestdrying speed, strongest airflow, and the highest consumer satisfaction of any hair dryer we tested."Itgot hair smoother, and in less time, than any hair dryer I've used," said one tester.

MOST POPULAR SUNSCREEN

Year-round, readers couldn't get enough of thisbest natural sunscreen (yay!). With a powerful SPF 50, not only does it prevent sunburns, but it leaves a silky finish for a great base beneath makeup."My skin looks really great, is not oily, doesn't smell like sunscreen, and is protected," raved one Amazon reviewer.

MOST POPULAR FACE MOISTURIZER

For thebest anti-aging skin care, look no further than this NeutrogenaGood Housekeeping Seal-holder. According to both Lab and consumer tests, thisSPF 30 formulahydrates and firms skin, smooths wrinkles, andabsorbs quickly without irritating skin, despite being loaded with anti-aging retinol.It also has over 1,500 reviews on Amazon, so it's no wonder our readers love it so much, too.

MOST POPULAR FACE SERUM

$166.00

Agreat vitamin C serum brightens skin and fades dark spots, and this one is packed withL-Ascorbic acid that's effective but won'tirritate skin. "It firms and brightens skin, and leaves it supple and glowy," senior Beauty Lab chemist, Sabina Wizemann said. Addedvitamin E nourishes the skin,and Ferulic acid stabilizes the serum for the best results possible.

MOST POPULAR NIGHT CREAM

$76.00

When we tested thebest night creams, this clean formula blew away the competition,boosting hydration by over 40% in just six hours. Testers loved thatthe formula absorbed quickly and that a little goes a long way, so the pricey formula actually lasts.It's packed withCaudalie'sstar ingredient Resveratrol, which is derived from grapes and usesthe same regenerating process that allows grape vines to live up to 100 years just imagine what it can do for your skin.

MOST POPULAR SILK PILLOWCASE

The benefits of silk pillowcasesgo way beyond just beauty sleep. They're proven to have anti-aging qualities bypreventing wrinkles and fine lines, and give you healthierhair by reducingbedhead, frizz, and breakage.Our readers can't stop buying thisGood Housekeeping Seal holder: It's is thebest silk pillowcaseyou can buy, and since it's backed by the Seal, if it's defective, we'll refund you out of our own pockets.

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10 Most Popular Beauty Products on Good Housekeeping 2019 - GoodHousekeeping.com