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Written by OSEA Staff | Published September 8, 2026.
Ready to level up your skincare routine? Invest in a serum. Ultra-concentrated and fast-absorbing, serums are hardworking formulas designed to address targeted concerns, from dullness and dryness to visible signs of aging. Typically thinner in consistency, they're known for having a higher percentage of active ingredients than moisturizers.
Our clean, clinically tested serums are powered by seaweed and drench your skin in ingredients such as bio-retinol, peptides, AHAs, and hyaluronic acid, but how you apply them can make all the difference. Ahead, discover the right serum for your skin's needs, plus tips on how to layer them for maximum results.
Best Practices for Layering Serums
As a general rule of thumb, always apply skincare from thinnest to thickest. This strategy will help the thinner products absorb better into the skin. All OSEA serums share the same lightweight, gel-like consistency, with the exception of Seaglow Overnight Serum AHA Treatment, making layering easy, so you can get the most out of every drop.
For Visibly Smoother, More Hydrated Skin
Hyaluronic Sea Serum
Two different weights of hyaluronic acid combine with Japanese Miru seaweed, plus volcanic marine ferment to increase hydration, visibly smooth lines, improve elasticity and nourish skin in this lightweight, moisture-boosting anti-aging serum. The remarkable clinical results speak for themselves: After just one use, 100% showed improvement in fine lines and wrinkles*, while 97% showed improvement in skin hydration.*
*Based on an independent third-party clinical study.
When and How to Use It
Hyaluronic Sea Serum works well day and night and layers nicely under Dream Night Serum, especially if visibly firmer, smoother skin is your main goal. If you don’t want to layer your serums, you can use Hyaluronic Sea Serum during the day, and Dream Night Serum at night.
Pro tip: Layer on our hyaluronic acid serum when skin is still slightly damp, for enhanced absorption. Follow with your favorite moisturizer to seal in hydration.
For Visibly Firmer, Smoother Skin Overnight
Dream Night Serum with Bio-Retinol
This practically weightless formula supercharges skin with algae-derived bio-retinol, red seaweed, two firming peptides and hydrolyzed hyaluronic acid to visibly reduce the look of wrinkles and firm the look of skin overnight, during the skin’s nightly repair phase. And there are clinicals to back it up: Immediately, after one use, 100% showed visible improvement in crow’s feet and fine lines, wrinkles and deep wrinkles.* After 4 weeks, it was clinically shown to visibly improve skin firmness.*
*Based on an independent third-party clinical study.
When and How to Use It
The beauty of Dream Night Serum is that it harnesses the power of clinically backed, algae-derived bio-retinol to mimic the effects of retinol—improving the visible signs of aging and the appearance of fine lines, wrinkles, and deep wrinkles—without irritation.
Although designed for evening use, it’s gentle enough for both morning and night, unlike regular retinol, which is typically limited to nighttime and may require spacing out (skin cycling) throughout the week. Plus, there’s no need to worry about sun sensitivity, though SPF is always a must during the day!
This powerful serum layers nicely under any moisturizer, but we suggest pairing it with Dream Night Cream with Bio-Retinol for optimal results.
For Brighter Skin & Refined Texture
Seaglow Overnight Serum AHA Treatment
This multi-acid blend with a concentration of over 11% exfoliates while you sleep for softer, smoother, brighter-looking skin by morning. Seaglow Overnight Serum combines five different acids, including malic, lactic, citric, tartaric and phytic acid to minimize the look of pores and rough texture, transforming skin while you sleep. Our overnight serum also features fermented shiunku oil, red algae, spirulina and seawater to reinforce the skin’s moisture barrier. As the acids slowly work their way into the skin overnight, these nourishing ingredients minimize irritation for an dreamy exfoliating experience that’s perfect for all skin types. And the results continue to build over time: Immediately after one use, 97% agreed that it helped reveal smoother-feeling skin.* After two weeks, 94% agreed that it had smoothed the look of pores.* And after four weeks, 97% agreed that skin felt retexturized.*
*Based on an independent third-party consumer-perception study.
When and How to Use It
Think of Seaglow Overnight Serum AHA Treatment as your ultimate topical night cap. Our powerful serum was formulated for nighttime use only. Use two times a week, or as needed. We do not recommend layering this serum with other serums, as it would reduce its potency, however you can follow with your favorite moisturizer. Always wear sunscreen during the day, but especially when incorporating any AHAs into your routine, as they can increase photosensitivity.
For Bright, Wide-Awake-Looking Eyes
Ocean Eyes® Age-Defying Serum
This beautiful serum is made with active botanicals—including clinically tested quinoa extract, caffeine and a biomimetic tetrapeptide—and works its magic to visibly smooth fine lines and counteract puffiness in the delicate under-eye area. It also contains a blend of our signature Undaria and red seaweed to visibly brighten and reduce the look of crow’s feet, dark circles and under-eye bags. The cooling and refreshing roller ball feels incredible going on and leaves your skin smoother, softer, brighter, and ultranourished. You have to see it to believe it: Immediately, after one use, 100% showed improvement in hydration around the eye area, while 97% showed visible improvement in crow's feet, fine lines and wrinkles.
*Based on an independent third-party clinical study.
When and How to Use It
On clean, dry skin, gently roll Ocean Eyes® Serum under eyes 2-3 times, moving from the inner to outer corner, avoiding the eyelids. Use morning and night. Allow the serum to absorb on its own, or use your ring finger to smooth it in for full absorption. For best results, layer under Advanced Repair Eye Cream.