Alcohol Free Lager: ISO (GF)

Cold Bath ISO. Isotonic Lager.

The UK's first beer to hold ISO accreditation for its isotonic properties. Not a claim on a label. A tested, verified, independently certified fact.

Cold Bath ISO sits within the isotonic range of 270 to 330 mOsm/kg, the same concentration as your body's own fluids. We didn't assume it. We sent our beers to a UKAS-accredited independent lab, found they didn't qualify, reformulated the recipe, and tested again until we could prove it. That's what the accreditation means. Not that we said it. That a lab confirmed it.

The Beer

Clean. Crisp. Full-bodied. This is a proper lager that happens to have a measurable scientific property behind it. You drink it because you want a beer, not because you're looking for a supplement. The isotonic composition is a fact about what's in the can. The taste is the reason you'll buy it again.

Alcohol-free at 0.5% ABV. For context, some sourdough loaves contain more alcohol than that. Gluten-free. Sustainably brewed in Yorkshire from natural ingredients.

The Moment

ISO is built for the moment after the effort. The physical need to replenish. The mental need to reward and restore. After the ride. After the match. After the session. That point where your body is asking for something and your brain wants to celebrate the fact that you did it.

We've spent years working with sport brands to understand that moment. Zwift, Factor Bikes, Le Blanq Joyrides, Sigma Sports, J.Lindeberg, Rapha at their London Clubhouse. York Knights. When the UCI Road World Championships came to Harrogate, we were there. Cold Bath ISO is everything we learned, in a can.

Born on Cold Bath Road

Cold Bath Brewing Co. comes from Harrogate, North Yorkshire. Britain's original spa town, built on centuries of restoration, wellness, and recovery. Cold Bath Road was one of the key arteries to the springs, the place people went to immerse themselves in cold, mineral-rich water because they believed it would restore them. It's where this brewery was born.

450 years of Harrogate's heritage of recovery and replenishment. An isotonic beer that's been independently tested and certified. Same principle, different century: what you put into your body after effort should be as considered as the effort itself.

Specifications