What Marathon Runners and Your Skin Have in Common (Hint: It’s Seaweed)

Recently, a fascinating insight surfaced in discussions around elite marathon performance.

In interviews following record-breaking runs, including commentary from sports scientist Yannis Pitsiladis, attention turned to something unexpected:

Seaweed.

At the highest level of endurance sport, athletes are no longer just fuelling with sugar—they’re managing how fluids and energy move through the body. And this is where seaweed quietly enters the story.

The human body, under stress, becomes a system of flows:

Deliver too much sugar too quickly, and the system overloads.

Deliver fluids without structure, and they pass through inefficiently.

What elite athletes have begun to adopt is a way of structuring these flows—using natural hydrogel systems derived from seaweed.

These gels don’t just contain nutrients.

They help organise how water and dissolved molecules behave.

Certain seaweeds produce remarkable compounds—gels that can bind water, interact with minerals, and form soft, flexible networks.

You may have heard of alginate, a compound from brown seaweed used in some sports gels. Under the right conditions, it can form a gentle matrix that helps manage how liquids and nutrients are released in the digestive system.

But alginate is just one example.

Across the seaweed kingdom, there is an extraordinary diversity of natural gel systems:

Together, they represent something much bigger than “an ingredient.”

They are tools for structuring hydration itself.

From Marathon Performance… to Everyday Biology.

Now here’s where it gets interesting.

You don’t need to run a marathon to benefit from this. Because your body is constantly managing hydration—not just in your gut, but in:

It’s more…

“sessile glamour” than high-performance endurance.

But beneath that calm surface, it’s still:

And just like in sport, how water is held, moved, and released matters deeply.

At PhycoHealth, our interest in seaweed has never been just about nutrients. It’s about how these marine plants manage water in a dynamic, mineral-rich environment—something they’ve evolved to do extraordinarily well.

The seaweed gels we work with are:

This makes them uniquely suited to:

Supporting gut environments, where flow and balance are everything.

Enhancing skin hydration, not just by adding moisture, but by helping to retain and regulate it. Integrating into foods, where texture, release, and stability matter.

We often think of hydration as:

“Drink more water.”

But biology is more nuanced than that.

Hydration is about:

And increasingly, we’re seeing that natural structures—like those found in seaweed—can play a role in shaping this.

From Ocean Systems to Human Systems

Seaweed grows in one of the most dynamic environments on Earth:

To survive, it has evolved materials that don’t just sit in water…

They work with it.

And now, whether in elite sport, skin care, or nutrition, we’re beginning to understand just how powerful that capability is.

Because it reframes seaweed entirely.

Not just as:

But as something far more fundamental:

A biological material that helps organise fluids in living systems.

From marathon runners pushing the limits of human performance…

to your skin quietly maintaining balance every day…

The same principle applies.

Seaweed doesn’t just hydrate.

It helps the body understand how to be hydrated.