A frosted glass bottle with a silver pump top labeled OSEA hyaluronic sea serum, containing 1 fl oz (30 ml) of product. The liquid inside appears light green. Standing outdoors by the ocean in natural light, a person uses a dropper to apply OSEA Hyaluronic Acid Sea Serum to their face, helping improve skin firmness. Close-up of a smiling person applying OSEA Hyaluronic Acid Sea Serum to their cheek, showing skin texture and fine lines. Text highlights hydration, improved elasticity, reduced wrinkles, and fragrance-free firming skincare. A woman with radiant skin applies OSEA Hyaluronic Acid Sea Serum, packed with hyaluronic acid. Clinical results: 100% saw reduced fine lines/wrinkles, 97% reported more hydration and firmer skin. A clear bottle of OSEA Hyaluronic Acid Sea Serum is shown with “Lightweight, Non-Sticky Gel Serum” above it, surrounded by drops of gel on a light blue background.
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A frosted glass bottle with a silver pump top labeled OSEA hyaluronic sea serum, containing 1 fl oz (30 ml) of product. The liquid inside appears light green.

OSEA Hyaluronic Acid Sea Serum

1 oz

Why we love it

  • Free from 3,000+ banned ingredients and meets our EU-informed standards.
  • Instantly increases hydration for a fresh-faced glow.
  • Firming properties strengthen skin's natural moisture barrier.
  • Clinically tested for anti-aging, made with Earth-friendly ingredients.
Purchase options

Hyaluronic Acid Sea Serum $88.00

Free carbon neutral shipping on orders $29+. Arrives in 3–5 days. Free, easy 30-day returns.

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
- Minimize the look of lines & wrinkles in 2 weeks
- Visibly improve skin firmness & elasticity in 2 weeks

After 2 weeks*:

- 100% agreed skin felt softer and smoother
- 97% agreed skin felt more supple & elastic
- 93% agreed skin felt firmer & bouncy

After 4 weeks*:

- 97% agreed it minimized the look of lines & wrinkles
- 90% agreed expression & emerging lines appear less visible

*Based on a third-party clinical study conducted over 4 weeks on 30 women ages 43-64 (including; expert skin grading, instrumental measurements & consumer perception study).

Water / Aqua / Eau, Codium Fragile Extract, Betaine, Sodium Hyaluronate, Tremella Fuciformis Sporocarp Extract, Bacillus Ferment, Hydrolyzed Hyaluronic Acid, Glycerin, Sodium Benzoate, Potassium Sorbate, Citric Acid, Lonicera Japonica (Honeysuckle) Flower Extract, Lonicera Caprifolium (Honeysuckle) Flower Extract, Sodium Copper Chlorophyllin.

Please be aware that ingredient lists may change or vary from time to time. Please refer to the ingredient list on the product package you receive for the most up-to-date list of ingredients.

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

Grove Values

An open jar of OSEA collagen dream night cream and a pump bottle of OSEA undaria algae body oil are displayed on a light background.

Seaweed skincare rooted in family wisdom

OSEA was founded in Malibu in 1996 by Jenefer Palmer, inspired by her grandmother Elsa’s belief in the restorative power of the ocean. Drawing on multigenerational female healing traditions, OSEA crafts clean, seaweed‑infused skincare using thoughtfully sourced ingredients, climate‑positive packaging, and uncompromising transparency.

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3,000+ BANNED INGREDIENTS

Beautifully clean makeup and skincare.

From lip color to moisturizer, every beauty product is vetted for ingredients and materials that align with our strict standards, so you can feel confident in what goes on your skin.

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No hidden ingredients

Made without parabens, phthalates, or heavy metals

Two green glass bottles of OSEA hyaluronic sea serum with silver caps are displayed on a pink circular background. One bottle stands upright, while the other lies at an angle.

Safer, smarter formulas

No talc, formaldehyde donors, or petroleum-based ingredients

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Less plastic, fewer microplastics

Low-waste formats and plastic-free packaging where possible

A close-up of a human fingertip with colorful microplastic particles on the skin, and images of a plastic bag, bottle, and six-pack ring layered in the corner, highlighting plastic pollution.

Go Beyond Plastic™ and microplastics.

Plastic products break down into microplastics that can affect human health.

Grove Co. is on a mission to reduce plastic in home essentials — for both people and for the planet.

Learn more on the Home Planet blog

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