By Monica N. for Stacked Fitness Hydration
August 31, 2026 • 6 min read
If you're training four or five days a week somewhere between your twenties and your fifties, lifting, running, HIIT, whatever gets it done, you've probably heard two supplement words more than any others: hydration and creatine. Usually they get talked about as separate categories, on separate shelves, solved by separate products: a hydration supplement over here, a tub of creatine over there. The research doesn't actually treat them that way, and neither should you.
Here's what the science says about each one on its own, what happens when you stack them, and why "just drink more water" and "just take the best creatine you can find" are both missing half the picture.
The hydration cost most people don't notice
Dehydration doesn't announce itself. By the time you're thirsty, you're often already behind. Thirst is what researchers call a lagging indicator, meaning the effects on your body show up before you consciously feel them (Adams et al., 2019). And the threshold for those effects is lower than most people assume.
Losing as little as 1–2% of body weight through sweat, a couple of pounds for most adults, is enough to measurably change how you perform and think. Below is where the research has found the earliest effects kick in.
② 1–1.6% loss (men): measurably worse cognitive performance, greater fatigue and anxiety, per Ganio et al., 2011.
â‘¢ 2% loss: endurance performance begins to drop, with power output and muscular endurance declining further as fluid loss continues, especially in high-intensity training, per Cheuvront & Kenefick, 2014 and Nuccio et al., 2017.
None of that requires a hard workout in the heat. It can happen over the course of an ordinary day if you're not drinking with any intention, and electrolytes matter as much as plain water here, since sodium and potassium are what actually help your body hold onto the fluid you're taking in, rather than losing it straight back out.
This is why sports nutrition researchers stopped treating water and electrolytes as separate conversations a long time ago. The American College of Sports Medicine's position stand on exercise and fluid replacement recommends replacing both fluid and sodium lost through sweat, not just fluid alone, because plain water without sodium can actually suppress thirst and increase urine output before your body has fully rehydrated (Sawka et al., 2007). In practice, that means a well-formulated hydration supplement, one built around sodium and potassium instead of sugar, does more for real-world hydration than water by itself, especially on training days.
What the creatine research actually shows
Creatine is one of the most studied supplements in sports science, and it's not close. A 2025 meta-analysis in Nutrients pooled 69 randomized controlled trials and 1,937 participants to look at what creatine monohydrate supplementation actually does for strength (Kazeminasab et al., 2025). If you're trying to figure out what the best creatine actually looks like on paper rather than in marketing copy, this is about as large and current a dataset as exists. The results held up across a huge body of research:
The same analysis found gains in vertical jump and peak power output too, with effects generally strongest in younger adults and in people already training consistently, which is the real headline. Creatine isn't a magic switch; it's a multiplier on the work you're already doing in the gym.
It's not just a young lifter's supplement, either. A growing body of 2025 research is looking at creatine's role in older adults and in the muscle-brain axis, with early findings suggesting benefits for cognitive health alongside the well-established muscular ones (Forbes et al., 2025; Frontiers in Nutrition, 2025).
How much creatine and how much electrolyte you actually need
Most of the confusion around the best creatine dose comes from old "loading phase" protocols. The International Society of Sports Nutrition's position stand concludes that a straightforward 3 to 5 gram daily dose of creatine monohydrate is just as effective at fully saturating muscle creatine stores over roughly three to four weeks as the older 20 gram loading approach, just without the water retention and bloating some people report during a loading phase (Kreider et al., 2017). That is the dose the research actually supports for daily, indefinite use, which is also why a single 5 gram serving is designed to be enough rather than a marketing minimum.
Electrolyte needs scale with how much you sweat, not with one flat daily number. Research on sweat composition has found sodium losses ranging from roughly 460 to 1,840 milligrams per liter depending on the person, the heat, and the intensity of training, which is part of why generic advice to "just drink water" tends to undershoot what active adults actually lose (Sawka et al., 2007). This is also the piece most creatine routines skip entirely. The connection between hydration and creatine is not a nice-to-have, it is built into how creatine pulls water into muscle cells in the first place.
Why stack them instead of choosing one
Creatine pulls water into your muscle cells to do its job, and that is part of the mechanism, not a side effect to manage around. Which means creatine supplementation actually raises your need for consistent fluid and electrolyte intake, not lowers it. Taking creatine without paying attention to hydration is working against your own supplement. Taking it alongside proper electrolyte intake is how you get the full effect: better cell hydration, better nutrient delivery, better recovery between sessions.
This is exactly the gap Stacked was built to close, and it's why we'd argue TONE is the best creatine and hydration product on the market for anyone who doesn't want to manage two separate routines: 5 grams of creatine and 980 milligrams of electrolytes in a single daily stick, instead of a tub of creatine powder in one cabinet and a separate hydration supplement in another.
Making it a daily habit, not a project
The research is consistent on one more point: none of this works as a one-time thing. Creatine's benefits build over weeks of regular use, and hydration status is something your body is managing every single hour, not just during a workout. A few practical starting points:
Aim for consistency over precision. One creatine serving a day, every day, outperforms a "perfect" protocol you can't stick to.
Drink with electrolytes, not just water, especially around training. Plain water without sodium can actually blunt your body's ability to hold onto fluid.
Pair it with something you already do. Morning coffee, post-workout, before bed, habits stick better when they're attached to a routine you've already built.
Consistency is what turns effort into progress. Hydration and creatine are two of the most well-researched, lowest-effort levers you have for getting more out of the training you're already doing. You just have to actually do them, daily, together, with a hydration supplement and creatine routine simple enough to survive a busy week.
Further reading
Kazeminasab et al., 2025, Nutrients, creatine and strength meta-analysis
Kreider et al., 2017, Journal of the ISSN, position stand on creatine dosing and safety
Sawka et al., 2007, ACSM position stand on exercise and fluid replacement
Hydration knowledge, attitudes and behaviors among athletes, PMC
Hydration strategies in endurance exercise, Nutrients
Creatine supplementation and the muscle-brain axis in aging, Frontiers in Nutrition
