I Test Beauty Products for a Living—These Are the Only 22 You Need from Amazon’s Big Deal Days

Two minutes is all it takes for this sheer glaze to totally transform your locks. The brand compares it to lipgloss for your hair, as it provides a shiny, well-hydrated coating that lasts multiple washes. It's my secret weapon for glass-like, "liquid" hair for sure, so I'm personally taking advantage of the 25% off sale.

I swear, this smoothing blowout mist is the closest it comes to an at-home keratin treatment dupe. It contains high-tech, heat-activated bonding polymers that provide a protective coating around the hair shaft (which reduces frizz), plus spirulina protein to simultaneously strengthen strands. For my frizz-prone wavy-curly hair, it's an absolute godsend.

This is one of the only hair growth serums that actually makes a noticeable difference, IMO. You do have to use it consistently (like, every single day for three months), but I've personally noticed new baby hairs filling in around my sparser temples over time. I fly through bottles though, so this 30% off deal is calling my name.

I'd buy this hair oil for the creamy coconut- and yuzu-infused scent alone, but it also makes my strands impossibly soft and shiny. I apply it before bed, making sure to concentrate it on the ends of my hair, and I somehow wake up with zero split ends and tangles. Magic!

Yes, they're pricey, but oh are they worth it. SK-II sheet masks are my ultimate treat yourself buy. I rarely use the term poreless (every human being alive has pores!), but that's exactly how my skin looks after marinating under this serum-soaked sheet for 20 minutes. Celebrity makeup artists swear by them too for red carpet prep, in case you need any more convincing to snag a pack of ten.

This moisturizer has been clinically shown to visibly lift and sculpt the face in just six weeks (yes, really), and you should see the accompanying before and after photos—truly wild. It's also deeply hydrating thanks to polyglutamic acid (a peptide also found in dermal fillers) without making my skin feel too greasy. True story: I recently influenced a friend to give it a try, and she has since restocked three times, telling me she "can't live without it."

Can you tell I love a good sheet mask? This pack from Sulwhasoo is a no-brainer, as it's infused with three weeks' worth of the brand's First Care Activating Serum, a formula featuring ginseng that's been fermented for over 500 hours—and is currently tagged at 30% off! WWW beauty director Erin Jahns also considers herself a major Sulwhasoo mask fan, noting that "[her] skin has never looked so hydrated, bouncy, and dewy."

I admittedly tested this on a whim when I needed a new oil cleanser right before heading out for a weekend trip. Now? I legitimately can't imagine my routine without it. The silky oil dissolves stubborn makeup and sunscreen in a snap without feeling too heavy, and it leaves behind the dewiest, healthy-looking sheen. I can see why it's considered Korea’s number one cleansing oil!

Take this 20% deal as your flashing neon sign to finally try the cult-favorite Lait-Crème Concentré. It's a French pharmacy staple among makeup artists, facialists, and editors alike; in fact, you'd be hard-pressed to find a beauty editor who doesn't bring home a bottle (or three) whenever they travel to Paris.

A smoothing serum that deeply moisturizes as it tightens pores, iS Clinical's Moisturizing Complex is the ultimate multitasker. With retinol, hyaluronic acid, and plenty of antioxidants, it's essentially three serums in one—for 25% off, might I add.

I swear, this soothing, redness-reducing serum makes it look like I'm wearing a sheer layer of skin tint. It immediately neutralizes discoloration and helps fade marks over time, but it also adds a subtle, all-over radiance—a secret weapon for no-makeup days.

This is not a drill: You can score the NuFace Mini+ for 30% off. If you have yet to experience the face-sculpting power of microcurrent, consider this your sign to bite.

I literally gasped when I saw the clinical results from this sculpting serum. It's not just hype; truly, this serum defines the chin and jawline in just two to eight weeks, and the before-and-after photos are (pardon the pun) jaw-dropping.

I genuinely have a fear of running out of my Might Patches. No other acne patch shrinks breakouts quite like these hydrocolloid dots, and I have no less than five boxes lying around my apartment for skincare emergencies. Yes, they're relatively wallet-friendly already, but why not stock up when they're discounted to $10?

You're not imagining it: Hailey Bieber's "holy grail" vitamin C serum is currently 50% off. The serum is already quite the steal given its potent formula with 20% stabilized L-ascorbic acid (most vitamin C serums with this concentration cost upwards of $200), so when that price gets slashed in half? Score!

IMO, there's never a better time to drop coin on spendy skincare gadgets than Prime Day. If you're hoping to add an LED mask to your routine (or looking to upgrade your current go-to), I can't recommend this one by Currentbody enough. (Neither can WWW UK beauty editor Eleanor Vousden, who tested it consistently for five months.) It also won "Best LED Device" in our highly-edited WWW 100 Beauty Awards, if that tells you anything about its skin-improving power.

It's a classic for a reason. Mario Badescu's Drying Lotion will always have a spot in my beauty cabinet, though I am due for a restock. Great news: It's currently 50% off through October 8.

Only a handful of TikTok-viral beauty products truly withstand the test of time. This jelly blush stick is one of them. The whole WWW team is obsessed with the innovative texture and impressive longevity. Seriously, this blush does not budge, which is why it won "Best for All-Day Wear" in our best blush sticks roundup.

Another viral hit, this blurring powder completely sold out day 1 during July’s Amazon Prime Day sale. That's when you know it's good. If you weren't able to snag it earlier this summer, I suggest adding it to your cart ASAP!

As far as contour products go, this one checks all the boxes: a creamy, buildable formula, a realistic-looking matte finish, and a precise, easy-to-use applicator. Bonus: It also comes with a built-in brush for seamless blending.

Creamy, richly pigmented, and impossibly long-lasting—you can't go wrong with this Urban Decay classic, which earned a spot in our best waterproof eyeliners guide. All 34 shades are worth your dollar, but Whiskey (a dark matte brown) remains a fan favorite, also beloved by Hailey Bieber.