Hydrogen water and sports: what studies show about training and recovery

For anyone who trains, hydration comes first: losing about 2% of your body weight in sweat can already hold back performance, and no special water makes up for not drinking enough. Hydrogen water is something athletes add on top. In small studies, it went along with less perceived fatigue and lower blood lactate in some people, but pooled data show no clear effect on VO₂max, endurance or strength — so treat it as a possible extra, not a shortcut.

Below: how much to drink around exercise, based on Prof. Oleh Pokotylo’s book 5 Fundamental Postulations of Drinking Water and US sports medicine guidance; what individual studies and three recent meta-analyses found; and how to keep hydrogen water fresh in your gym bag.

Why hydration comes first

Muscles are about 79% water, according to the U.S. Geological Survey, and hard exercise drains that supply fast. The American College of Sports Medicine (ACSM) estimates sweat rates for runners at roughly 14–⁠61 fl oz (0.4–⁠1.8 L) an hour, depending on body size, pace and weather. Prof. Pokotylo notes that an athlete can lose 1–⁠4 L (about 1 quart to 1 gallon) in a single hard session, especially in competition.

The margin is small. ACSM’s goal for drinking during exercise is to keep the water deficit under 2% of body weight, and the National Athletic Trainers’ Association (NATA) notes that dehydration of about 2% can already compromise performance, the body’s ability to shed heat, mood and recovery. For a 154 lb (70 kg) person, 2% is only about 3 lb (1.4 kg) of sweat.

Many people start behind: according to NATA, more than half of athletes, from youth sports to the pros, arrive at workouts already under-hydrated. And people who drink to thirst during activity typically replace only about two-thirds of their sweat losses.

Weigh yourself to learn your number

Both Prof. Pokotylo and ACSM recommend the simplest check: step on the scale before and after training. Each pound lost is roughly a pint (16 fl oz) of fluid — about 1 L per kg. Check after a few kinds of sessions — easy, hard, hot — and you’ll know how much to drink for each.

How much to drink before, during and after exercise

Here’s Prof. Pokotylo’s simple formula next to the ACSM position stand:

For a 154 lb (70 kg) person, ACSM’s pre-exercise amount comes to about 12–⁠17 fl oz (350–⁠490 mL); if your urine is still dark, it suggests another 3–⁠5 mL per kg about 2 hours before you start.

The book’s bigger idea is to replace most of your losses as you go. If you usually lose 2.2 lb (1 kg) in a session, aim to drink about 80% of that — roughly 27 fl oz (800 mL) — in small portions while you train. Afterward, weigh yourself again and drink one and a half times the deficit that’s left: (1,000 − 800) × 150% = 300 mL, or about 10 fl oz. ACSM lands on the same ratio, since drinking a lot at once makes you pass more urine; NATA recommends up to 150% when you have under 4 hours to recover.

Longer runs and hot days

For runners at short and middle distances, Prof. Pokotylo suggests 6–⁠8 mL per kg about 2 hours before the start — 12–⁠16 fl oz (360–⁠480 mL) for a 132 lb (60 kg) runner. Marathoners, he notes, can lose 2–⁠8% of their body weight, mostly as water. For events of about an hour or longer, ACSM notes that drinks with carbohydrates and electrolytes can do more than water alone, and salty snacks or drinks afterward help the body hold on to fluid. For serious training or unusual conditions, the book recommends an individual plan from a sports nutritionist.

Don’t overdo it

NATA warns that drinking more than you sweat — water or sports drinks — can dilute the sodium in your blood, a dangerous condition called exercise-associated hyponatremia, most often in sessions of an hour or more. The check is the same scale: you shouldn’t weigh more after exercise than before.

Why athletes look at hydrogen water

Hard exercise increases the production of reactive oxygen species — free radicals — in working muscles. That isn’t all bad: these molecules are part of the signal that tells your body to adapt. In excess, though, they’re linked to fatigue and muscle damage. Prof. Pokotylo notes that unusual or very intense efforts, such as interval training or competition, drive oxidative stress and lactic acid higher.

In cell experiments published in 2007, H₂ selectively neutralized the hydroxyl radical, the most aggressive of these molecules, while leaving others with useful roles alone. A 2019 review by Tyler LeBaron and colleagues noted that conventional antioxidants and anti-inflammatories often blunt the gains from training. The authors proposed that hydrogen might instead act as a “redox adaptogen,” reducing the harm of exhausting exercise while preserving its benefits — and stressed that more research is warranted. It’s a hypothesis, not a proven effect.

What individual studies found

Human studies are small, and their results vary.

Lactate and muscle fatigue

In a 2012 Japanese pilot study, 10 young male soccer players drank 1,500 mL (about 51 fl oz) of either hydrogen-rich or placebo water over the evening before and the morning of testing; the hydrogen water was made by placing magnesium sticks in the bottles. After 30 minutes of hard cycling, blood lactate rose with placebo but not with hydrogen water, and leg strength didn’t drop in the early phase of a fatigue test. Blood markers of oxidative stress and muscle damage didn’t change.

Perceived fatigue and heart rate

The largest of these trials, published in Japan in 2019, ran two experiments. In 99 untrained adults, those who drank hydrogen water 30 minutes before a cycling test reported less fatigue after mild exercise than those who drank placebo water. In 60 trained adults who drank it 10 minutes before exercise, the hydrogen group showed higher maximal oxygen uptake and lower ratings of perceived exertion.

In a smaller US crossover study the same year, 19 healthy adults took hydrogen-producing tablets in water the day before and the day of a treadmill test. Their average heart rate and breathing rate during the test were lower, but maximal values didn’t change.

Repeated sprints

In 2022, a Czech team tested 16 professional soccer players on 15 sprints of 30 m (about 33 yd) with 20-second breaks. After hydrogen-rich water, the last sprints were faster than after placebo — by 2.7–⁠3.4% over the first 15 m of the 14th and 15th sprints, and by 1.9% over 30 m in the final one. Blood lactate and perceived exertion didn’t differ.

A study that found no effect

The same group gave 24 trained young runners 1,260 mL (about 43 fl oz) of hydrogen-rich water in four doses over the 2 hours before a run to exhaustion at maximal aerobic speed. Time to exhaustion, blood lactate and heart rate were no different from placebo.

That’s typical of a young field: small groups, short protocols, different doses and ways of delivering hydrogen, and results that don’t always agree.

What the meta-analyses say

Three meta-analyses, published in 2023 and 2024 by overlapping research teams, combined trials in healthy adults that mostly used hydrogen-rich water and, in some cases, inhaled hydrogen gas or hydrogen baths.

The first (19 studies, 402 participants) concluded there was moderate evidence that hydrogen eases fatigue but doesn’t improve aerobic capacity. The second (27 publications, 597 participants) found no clear effect on endurance or strength and a small benefit for lower-body explosive power. The third, the smallest (7 experiments, 76 participants), found no direct drop in exercise-induced oxidative stress, only a modest rise in a blood marker of antioxidant capacity, mainly with intermittent exercise. All three teams call for more rigorous studies. In plain terms: hard efforts felt slightly easier, but hydrogen hasn’t been shown to make people fitter, stronger or faster.

How to fit hydrogen water into your training

• Make it part of your fluid plan, not an extra. Use hydrogen water for the drinks you’d have anyway — before, during and after training.
• Drink it fresh. In an open glass, hydrogen water keeps its properties for only about an hour. A disc in a closed bottle keeps generating hydrogen, so the water stays hydrogen-rich for up to 12 hours: drop a Living Aqua Hydrogen Water Disc into your bottle before you leave, and it’s ready in 5 minutes.
• Pick a bottle that fits the disc. The Living Aqua Insulated Bottle is leak-proof stainless steel with a wide 2.2 in (55 mm) mouth that the 1.8 in (45 mm) disc drops right into, and it keeps drinks cold. The 22 oz (650 mL) size suits a gym bag; the 32 oz (950 mL) covers a whole day.
• Keep the disc in plain water. It’s made for still drinking water up to 122 °F (50 °C); tea, coffee, juice and carbonated drinks make it ineffective. Carry sports drinks in a separate bottle.
• Start with safe water. The disc isn’t a filter. If you drink tap water, fill your bottle from the hydrogen-rich alkaline pitcher, which filters it in about 2 minutes.

What hydrogen water won’t replace

• Enough fluid. No amount of H₂ makes up for a water deficit.
• Electrolytes and carbohydrates for long or hot sessions.
• Sleep, food and rest days — the basics of recovery.
• Medical care. Pain, an injury or a health condition calls for a doctor, not a new water bottle.