It made one fan look “10 years younger”
Top Osea Beauty Products
- Hilary Duff’s Go-To: Hyaluronic Sea Serum, $79 (orig. $88)
- Brittany Mahomes Is ‘Obsessed’: Undaria Algae Body Oil, $76 (orig. $100)
- PEOPLE Writer-Loved: Undaria Cleansing Body Polish, $43 (orig. $48)
- Instantly Depuffs: Ocean Eyes Age-Defying Serum, $53 (orig. $58)
As a millennial, watching clips from Hilary Duff’s tour has filled me with early-aughts nostalgia. Between the butterfly clips and Lizzie McGuire-inspired T-shirts, there’s plenty to obsess over, but I can’t stop noticing Duff’s glowy skin.
Luckily for me, Duff previously broke down her skincare routine for PEOPLE, and she said she uses Osea’s Hyaluronic Sea Serum daily. Chasing her radiant, even-looking skin tone, I tested the serum for a month, and it’s earned its spot in my lineup, too. Even better, you can get it on sale with our exclusive code OSEAPI.
Osea Hyaluronic Sea Serum

$88 $79 at Osea
Related: A Dermatologist Says These Drugstore Skincare Products Are ‘Just as Good’ as Luxury Brands — Shop Her Picks from $2
As a beauty-obsessed shopping writer, I have a massive collection of serums and moisturizers that promise to reduce fine lines and wrinkles. I recently fell in love with a hyaluronic acid serum that was too expensive for my budget, so I started hunting for a new one. From the first application, I was impressed by the Duff-used product because it instantly hydrated my skin and gave it a dewy look.
Hyaluronic acid is a popular skincare ingredient because, unlike regular creams that hydrate the skin’s surface, it works by drawing moisture to the skin. This serum stands out because it uses two different sizes of the powerful molecule to provide hydration at multiple levels for longer-lasting results. Combined with its other ingredients — Japanese miru seaweed, which balances the skin’s natural moisture level, and volcanic marine ferment, which helps reduce fine lines, according to the brand — the formula packs a punch.
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After a month of use, the fine lines on my forehead and between my eyes have softened significantly. Since my skin is consistently hydrated, I look so glowy that I’ve been skipping makeup altogether — and getting tons of compliments about how clear and even my skin looks. A little bit goes a long way, too. I use the serum twice daily before moisturizer and find that just three drops of the gel coat my face, neck, décolleté, and hands. I’ve used about a quarter of the bottle, so it should last me another few months.
Duff and I are far from the only fans of the serum. One 60-year-old shopper said it is “the best serum” they own because it “makes you look 10 years younger.” Though they have sensitive skin, they added that the fragrance-free formulation didn’t cause irritation. Another person who has used it for a year called it a “face lift in a bottle” and recommended it to friends.
Copy Duff’s skincare routine at a discount by using our code OSEAPI to get 10 percent off the Hyaluronic Sea Serum. Ahead, shop more popular Osea skincare products.
Undaria Algae Body Oil

$100 $76 at Osea
Undaria Cleansing Body Polish

$48 $43 at Osea
Ocean Eyes Age-Defying Serum

$58 $53 at Osea
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