Sourced.
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Runner on a trail during a race
For runners, riders, and triathletes

The wall isn't a mental problem.

Somewhere past two hours your pace drops and it's got nothing to do with willpower. Your glycogen's gone. Your electrolytes are gone. You didn't lose your nerve, you ran out of fuel.

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The problem

Water alone can't replace what a long session takes out of you.

Past about ninety minutes of hard effort, your body burns through glycogen and sweats out electrolytes faster than water alone can replace them.

Keep drinking water only and you actually dilute what's left. That's usually where things start to unravel.

90min
Where glycogen starts to bite
1-2L/hr
Sweat loss in hard sessions
Cyclist mid-ride, training on the road
Here's where it costs you

Training doesn't count for much if the tank's empty on the day.

Race day rewards the fuel plan as much as the training block.

You can put the miles in all year and still watch the pace fall apart late on. That's exactly where depletion shows up, not in training where you can ease off, but on the day, when easing off means the time you wanted is gone.

The fix

Three things, built for the distance.

Sourced is built around what a long session actually burns through, dosed to keep working well past the point where water alone stops helping.

01 Creatine

Extends your reserve

Supports ATP so your legs keep responding to effort later in the session.

02 Electrolytes

Keeps you steady

A full spread, not just sodium, replacing what a long session actually sweats out.

03 Fast carbs

Keeps you topped up

Fast-acting carbohydrate to keep your energy steady when the session runs long.

Runner smiling mid-race on a trail
Testimonial
"These supplements are built for elite level endurance. I'm working toward an Ironman 70.3, a 310km coast-to-coast ride, and my first full Ironman in Copenhagen this year."
Lewis
Triathlete, Half & Full Ironman
Built for the distance

Creatine Monohydrate + Electrolyte Formulation.

Creatine, full-spectrum electrolytes, and fast-acting carbohydrate, dosed for the miles that actually break people, not the easy ones. Blood Orange flavour, 30 servings.

Sourced Creatine Monohydrate and Electrolyte Formulation, Blood Orange
Creatine Monohydrate + Electrolyte Formulation
5g creatine, GMO free, natural sweeteners
£29.99 GBP
With subscription
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Third-party tested, Eurofins
Informed Sport option
Made in the UK