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What we know.
What the research says.
What actually works.

We started Rawstone because we couldn't find an electrolyte we trusted. These are the guides we wish existed before we started reading the studies.

Cornerstone read

The Science of Salt & Hydration

A plain-language primer on hydration: how much sodium you actually lose in sweat, why drinks below about 500mg of sodium per litre don’t hold fluid much better than plain water, and why the mineral form on your label matters as much as the milligram count. This is the long read behind everything else on this site. Start here if you want the full picture.

Sodium science 7 min read Tom Bolger
Read the guide →
RAWSTONE Mango-Passionfruit electrolyte powder tub on dark slate
Hydration

How dehydrated is too dehydrated?

Lose 2% of your body weight in water and focus, mood and reaction time drop. What the studies show, why it happens, and why thirst comes late.

6 min read Read →
Sodium science

Is 1000mg of sodium too much?

The plain-English context behind a number that looks big at first glance, and how to start with half a serve.

7 min read Read →
Fasting

Do electrolytes break a fast?

Zero-calorie minerals carry no energy, so the honest answer comes down to the rest of the ingredient list.

6 min read Read →
Keto

How much sodium do you lose on keto?

Why cutting carbs flushes more salt through your kidneys, and what the flat, foggy keto-flu feeling often comes down to.

6 min read Read →
Reading labels

How to read an electrolyte label

Five checks in about a minute: sodium per serve, sugar, the sweetener grade, the magnesium form, and batch testing.

9 min read Read →
Minerals

Magnesium citrate vs oxide

The same milligram number can behave very differently, because the form decides how much magnesium is in each gram and how well it dissolves.

6 min read Read →
Taste

Reb A vs Reb M: why some stevia tastes bitter

The common stevia can leave a bitter aftertaste. Why Reb M tastes closer to sugar, and how to spot it on a label.

6 min read Read →
Tool

Sweat calculator

Put in your weight, session length and conditions to estimate how much sodium you lose in a session.

Interactive Read →

Everything these guides argue for, in one tub.

1000mg of sodium per serve, potassium and magnesium as citrate, sweetened with Reb M. Launching on Amazon Australia this summer.