Hyaluronic Sea Serum

Hyaluronic Sea Serum

A lightweight, moisture-boosting serum that smooths wrinkles and fine lines while replenishing dry, depleted skin.

Regular price $88
Sale price $88 Regular price
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  • Overview
  • Choosing your shade
  • How to use
  • Ingredients
  • Sustainable Packaging
  • About the brand

Suitable for

All skin types.

Why we stand behind it

This fast-absorbing, anti-aging serum is clinically proven to smooth the appearance of all lines and deliver a lifted, firmer look. Two molecular weights of hyaluronic acid, seaweed, and snow mushroom, work together to restore and maintain optimal moisture levels, keeping your skin hydrated, plump, and dewy any time of day. Clinically and dermatologist tested.
Clinically proven to*:
- Instantly increase hydration.
- Strengthen skin’s moisture barrier.
- Deliver a lifted and firmer look.
- Fill the look of wrinkles.
- Minimize the appearance of all lines: fine lines, wrinkles, crow’s feet, laugh lines, and frown lines.

Immediately, after 1 use*:
100% showed an increase in hydration.
93% agreed skin looked brighter, more radiant, and refreshed.
After 2 weeks*:
100% agreed skin felt softer and smoother.
97% agreed skin felt more supple and elastic.
93% agreed skin felt firmer, plumper, and bouncy.
After 4 weeks*:
97% agreed it minimized the look of fine lines and wrinkles.
90% agreed expression & emerging lines appear less visible.
*Based on a third-party clinical and consumer study conducted over 4 weeks on 30 women ages 43-64 (including; expert skin grading, instrumental measurements, and consumer perception study).

Key ingredients

Japanese miru seaweed: Replenishes and balances the skin’s natural moisture level for healthy, hydrated skin.
2X hyaluronic acid: High and low molecular weights work synergistically to boost hydration, fullness and firmness of skin.
Volcanic marine ferment: This unique marine ferment effectively plumps and smooths fine lines.
Snow mushroom: Forms a hydration layer on skin to seal in moisture.

this product meets

The Credo Clean Standard™

Every product we offer meets our industry leading standards for safety and sustainability.

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This product is


Gluten Free

Fragrance Free

What is an undertone?

An undertone is the color beneath the surface of your skin, which never changes (even with a tan). There are three types of undertones:


I see red or pink undertones around the perimeter of my face and neck.
My skin burns easily, but barely tans.
My skin looks better in silver jewelry than gold.


I see both pink and yellow undertones around the perimeter of my face and neck.
My skin sometimes burns and sometimes tans.
My skin looks good in both gold and silver jewelry.


I see yellow or golden undertones around the perimeter of my face and neck.
My skin rarely burns, but tans easily.
My skin looks better in gold jewelry than silver.

Find your shade match

Take our 1 minute quiz and get matched to real people with your skin tone and type.


After cleansing, apply Hyaluronic Sea Serum over face. Allow to absorb.
Seal in with OSEA moisturizer of your choice.
Use morning and night.


For added hydration, mist face with Sea Minerals Mist before applying.

Full ingredient list

Click or tap an ingredient to learn more

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We co-founded the nonprofit Pact to demystify how to recycle your beauty packaging empties and divert waste from landfills.

How to recycle your empties

1. Disassemble and clean all components

2. Pick the right disposal bin

3. Drop off your empties at your nearest Pact bin

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1 Product Recycled = 10 Credo Rewards Points

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Earn rewards through recycling

1 Product Recycled = 10 Credo Rewards Points


Inspired by her grandmother’s lifelong love of the sea, Jenefer Palmer set out to share her passion through a plant-based skin care line infused with elements of the ocean. Distraught by the harmful chemicals she found in other products, Palmer resolved to craft her formulas with safer, nourishing ingredients.
While OSEA has now expanded into a world-renowned skin care line, their commitment has stayed the same—producing effective, wholesome products as pure as the ocean itself.


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