Is Symbiosis London Rejuvenate Serum Actually Clean?

Greenwashing Check

They claim ‘ocean-safe’ and ‘plastic-negative’ — but the third ingredient is a known marine toxin.

Expert Analysis · Honest Reviews · Real Results

1.🔍The Ocean-Safe Lie

So I finally caved and bought Symbiosis London’s Rejuvenate Serum — the one that screams “plastic-negative” and “ocean-safe” all over the packaging. Cute branding, but I read the ingredient list and nearly choked on my coffee.

The third ingredient is Ethylhexyl Methoxycinnamate — a UV filter that’s been banned in Hawaii and Palau because it bleaches coral reefs. The irony isn’t just rich, it’s dripping in green paint.

2.🧪Pretty Bottle, Big Promises

It’s a £48 serum (30ml) that claims to “rejuvenate” with a blend of marine actives. The marketing is gorgeous, the glass bottle is heavy, and the dropper feels premium. I wanted to love it.

Plastic-Negative Claim

They offset more plastic than they use — but that doesn’t change what’s inside the bottle.

Ocean-Safe Label

A marketing term with zero regulatory backing. Anyone can slap it on.

Marine-Derived Actives

Sounds eco-luxury until you realize the preservatives and filters tell a different story.

a woman is laying down with her eyes closed

Photo: Masum Rahimi / Unsplash

3.🌊What’s Actually Inside

The hero ingredients are Sodium Hyaluronate (hydration) and a “marine algae complex” that feels fancy but is mostly just film-forming goo. The real star is that coral-killing UV filter sitting at ingredient #3 — right after water and glycerin.

Sodium Hyaluronate: Lightweight humectant, pulls water into skin
Ethylhexyl Methoxycinnamate: UV filter — and known marine toxin
Glycerin: Basic hydrator, nothing special
Marine Algae Extract: Feels silky, does very little chemically

woman in white tank top holding white labeled bottle

Photo: Kalos Skincare / Unsplash

4.📋The Texture Trap

This serum is SLICK. Not sticky, but like a thin layer of silicone slipped over your face — absorbs in maybe 60 seconds but leaves a “I just used a primer” finish. It’s not bad, just… weird for a “clean” product.

By week two, my skin looked plump and fine. Nothing transformative. Then I noticed my sunscreens pilling on top. That’s when I stopped pretending this was worth the hassle.

💡

One Thing: Use this only at night with a bare face. Any product on top will ball up and roll off — not cute.

woman receiving facial mask treatment at spa

Photo: Rosa Rafael / Unsplash

5.⚖️The Honest Numbers

My skin stayed hydrated for about 4 hours. Fine lines? Unchanged. The glow people rave about? That’s just the silicones reflecting light — temporary, not real. It’s not terrible, it’s just not special.

✅

Buy if

You’re a collector of pretty bottles and don’t care about ingredient ethics.

⏭️

Skip if

You actually care about reef-safe claims — this is greenwashing with a price tag.

💰

Worth it?

At £48, no. You can get better hydration from The Ordinary for £10.

A person applying serum to their cheek with long pink nails

Photo: Laura Jaeger / Unsplash

6.✅The Final Cut

This serum is a masterclass in marketing over substance. The “ocean-safe” label is a flat-out lie, and the formula is mid-tier at best.

4.5/10

Greenwashed, overpriced, and underwhelming hydration

🛍️

Where to Buy: Only at Cult Beauty — and even then, try the travel size before committing. Or just don’t.