Is coconut water good for you?

Coconut water gets sold as nature's sports drink. It sits in the gym cooler and at the smoothie bar, and the cartons promise electrolytes, hydration and something vaguely tropical and good for you. If you've grabbed one after a workout because it felt like the better choice, it's fair to ask whether it's doing anything plain water wouldn't.

Drinks are an easy place to get stuck. Every bottle claims a benefit, the labels don't agree with each other, and trying to eat well turns into a research project you never signed up for. When the rules feel that complicated, it's tempting to stop trying. Coconut water turns out to be simpler than its marketing.

This page covers coconut water nutrition facts per cup from USDA data, how its potassium and sodium compare with sports drinks, juice and water, what six rehydration trials found, how much sugar it carries, whether it helps with weight loss, and who should be careful with it.

What Is Coconut Water?

Coconut water is the clear, slightly sweet liquid inside a young green coconut. In USDA FoodData Central it's 95 percent water by weight, with a little sugar and a lot of potassium dissolved in it, almost no fat and very little protein.

Coconut milk is a different product. It's made from grated coconut flesh pressed with water, so it carries the fat from the flesh. A cup of raw coconut milk has about 550 calories and 51 grams of saturated fat in USDA's data, against about 45 calories and almost no fat in a cup of coconut water.

Doctors in remote places have even used coconut water as a short-term IV fluid when nothing else was available. A 2000 report by Campbell-Falck and colleagues described one such case in the Solomon Islands. That was an emergency improvisation, and it doesn't make the drink a medical fluid.

Fresh vs packaged coconut water

Most coconut water you'll buy comes in a carton or bottle, and some of it is made from concentrate. USDA's ready-to-drink carton entry differs from its fresh entry in ways that matter: about a third less potassium, a quarter of the sodium, no fiber and more sugar per cup, as the table below shows. Some brands also add sugar or fruit juice, so read the ingredient list and the Added Sugars line on the label.

Store-bought coconut water is usually pasteurized or otherwise treated. If a refrigerated bottle says it hasn't been, think twice before giving it to someone at higher risk. The FDA's juice safety guidance says untreated juices can carry harmful bacteria and that children, older adults, pregnant women and people with weakened immune systems face the greatest risk of serious illness.

Coconut Water Nutrition Facts per Cup

Here's what a cup gives you, using the two coconut water entries in USDA FoodData Central: the liquid straight from the nut and a ready-to-drink unsweetened carton. The percentages are shares of the FDA's adult Daily Values.

Values from USDA FoodData Central SR Legacy entries 170174 (fresh, scaled to a 240-gram cup) and 174831 (carton, 245-gram cup), rounded. Daily Values: potassium 4,700 mg, sodium 2,300 mg, magnesium 420 mg, calcium 1,300 mg, manganese 2.3 mg, vitamin C 90 mg. Both have under 2 grams of protein and under a gram of fat. Brands vary.

Potassium is the headline, at 9 to 13 percent of the Daily Value per cup. Magnesium and manganese show up in useful amounts, at least in the fresh water. The sodium column is the surprise: the fresh entry has four times the sodium of the carton.

Other analyses disagree even more. A 2009 review of coconut water chemistry by Yong and colleagues collected measurements ranging from about 2 to 105 milligrams of sodium per 100 grams and about 200 to 310 milligrams of potassium. The variety of palm and the age of the nut change the numbers, and so does processing, which is why the label on your carton tells you more than any average.

How Much Potassium Is in Coconut Water?

A cup of coconut water has about 400 to 600 milligrams of potassium in USDA data, about 400 from a carton and 600 straight from the nut. Women need 2,600 milligrams a day and men 3,400, according to MedlinePlus, so one cup covers roughly 12 to 23 percent of the day.

A medium banana has about 422 milligrams, according to USDA FoodData Central. A cup from a carton roughly matches it, and fresh coconut water beats it. A typical sports drink has very little. The commercial drink analyzed in O'Brien and colleagues (2023) carried 132 milligrams per liter, about 32 in a cup. Sports drinks are built around sodium instead, because that's what heavy sweaters run short of.

Is coconut water good for blood pressure?

Potassium is one of the best-studied nutrients for blood pressure. A 2013 BMJ meta-analysis by Aburto and colleagues pooled 22 trials with 1,606 adults. Eating more potassium lowered systolic blood pressure by about 3.5 mm Hg and diastolic by about 2 mm Hg. The drop showed up in people who had high blood pressure, not in those who didn't. In 11 cohort studies with 127,038 people, higher potassium intake went with a 24 percent lower risk of stroke, and the trials found no harm to kidney function or blood fats in adults.

Coconut water itself has barely been tested. The one trial, by Alleyne and colleagues (2005), gave 28 people with high blood pressure bottled water, coconut water, a Caribbean drink called mauby or a mix of the two for two weeks. That's about seven people per group. Most of the coconut water group saw a significant drop in systolic pressure, but a group that small can't settle anything. The evidence supports potassium from food in general, and coconut water is one way to get it, along with beans, potatoes, yogurt and fruit.

Coconut Water vs Sports Drinks, Juice and Water

Here's how a cup of coconut water stacks up against the other drinks people reach for after a workout or on a hot day.

Coconut water from the USDA entries above; sports drink from the lab analysis of a commercial drink in O'Brien and colleagues (2023); orange juice from USDA Foundation entry 2003591; cola from USDA entry 174852. All scaled to a cup and rounded.

Three things stand out. Coconut water has about the potassium of orange juice with less than half the carbohydrate. It has a fraction of the sugar in cola. And a carton has a little over half the sodium of a sports drink, while USDA's fresh sample has more than twice as much. That sodium gap turns out to matter in the trials below. For the full sports drink story, see our page on whether Gatorade is good for you.

Is Coconut Water Hydrating? What the Rehydration Trials Found

Yes. Coconut water is mostly water, so it hydrates you. The question researchers asked is whether it does the job better than plain water or a sports drink after you've sweated off 2 to 3 percent of your body weight. Six small studies give a consistent answer:

• Saat and colleagues (2002). Eight men exercised in 31°C heat until they'd lost about 2.8 percent of their weight, then drank 120 percent of that loss over two hours. They regained 75 percent of the lost weight with fresh coconut water, 73 percent with water and 80 percent with a sports drink, and none of the differences were statistically significant. The coconut water caused less nausea and fullness, and the men found it easier to drink in large amounts.
• Ismail and colleagues (2007). Ten men ran for 90 minutes in 32°C heat and lost 3 percent of their weight. Over two hours, water restored 58 percent of the lost fluid, coconut water 65 percent, a sports drink 68 percent and coconut water with added sodium 69 percent. Only the sports drink and the salted coconut water beat plain water by a clear margin, and the authors judged the salted version as good as the sports drink and easier to tolerate.
• Kalman and colleagues (2012). This one was funded by a coconut water company. Twelve trained men drank about 2.2 liters within an hour after losing about 2 percent of their weight. Roughly 40 percent of the coconut water and of the sports drink stayed in the body three hours later, against about 35 percent of the water. Only a coconut water made from concentrate beat water by a statistically clear margin, and the authors didn't correct for running many comparisons. Both coconut waters left more men bloated, which the authors put down to the volume.
• Pérez-Idárraga and Aragón-Vargas (2014). Twelve active adults lost about 2 percent of their weight in a 32°C chamber. Three hours after drinking, they had retained 51 percent of plain water, 62.5 percent of fresh coconut water, 66 percent of a potassium-rich drink and 68 percent of a sports drink. Only the sports drink beat water clearly, and the authors concluded that extra potassium added nothing to what a sodium drink already does.
• Peart and colleagues (2017). Ten men cycled for an hour and then raced a 10-kilometer time trial while drinking coconut water or plain water. Their times were nearly identical, 971 and 967 seconds, and none of the physiological measures differed. When the men could drink as much as they liked, they drank about half as much coconut water as water.
• O'Brien and colleagues (2023). Nineteen cyclists rode for 90 minutes and then a 20-kilometer time trial on either a coconut water drink with added carbohydrate and salt or a commercial sports drink. Times and power came out practically the same. The drink's developer funded the study.

Put together, plain coconut water hydrates about as well as plain water and a little less reliably than a sports drink after heavy sweating. The coconut waters that matched the sports drink did it with added sodium. Potassium, the nutrient coconut water is famous for, didn't add much. Every study was small, with 8 to 19 people, so don't read much into the fine differences.

For a normal 30- to 60-minute workout, plain water and your next meal cover you. After long or very sweaty sessions, the sodium matters more than the potassium, so pair your drink with salty food or choose one built with more sodium. Our recovery drink guide compares coconut water with chocolate milk and electrolyte powders for that job.

How Much Sugar Is in Coconut Water?

Unsweetened coconut water has about 6 to 10 grams of sugar per cup: 6.3 grams in USDA's fresh entry and 9.6 in its carton entry. In the carton entry, more than half of that sugar is fructose, with smaller amounts of sucrose and glucose.

That's a lot less than the drinks it usually replaces. A cup of orange juice has about 21 grams of sugar and a cup of cola about 25. Sweetened and flavored coconut waters close the gap, so check the ingredients for added sugar or juice before you assume a carton is the light option.

Nearly all the calories come from that sugar: about 45 in a cup, or roughly 60 in an 11-ounce carton.

Is coconut water good for you if you have diabetes?

It can fit. Count a cup of unsweetened coconut water as about 9 to 10 grams of carbohydrate, less than half the carbohydrate in the same amount of orange juice or cola. Sweetened versions count for more. Many people with diabetes also take blood pressure drugs that raise potassium, so read the cautions further down before making it a daily habit.

Does Coconut Water Help With Weight Loss?

Not directly. No trial has tested coconut water for weight loss, and at about 45 calories a cup it adds calories that plain water doesn't. Whether it helps depends on what it replaces. Swap a 12-ounce can of cola for the same amount of carton coconut water and you save about 90 calories. Swap water for it and you add about 65.

Drinks also count for more than they seem, because they don't fill you up. In a crossover study by DiMeglio and Mattes (2000), 15 adults got about 450 extra calories a day for four weeks, either as soda or as jelly beans. On jelly beans they ate less at meals and more than made up for the candy. On soda they didn't cut back at all, and their weight rose only during the soda weeks. Coconut water carries far fewer calories than that soda, but the lesson holds: drink it because you like it, not as a diet tool.

If you're after fizz without the sugar, our look at whether sparkling water is good for you covers the zero-calorie option.

Can Coconut Water Give You Hyperkalemia?

Yes, if your kidneys can't clear potassium. Hyperkalemia means too much potassium in the blood, and it can trigger dangerous heart rhythms. The normal range is about 3.7 to 5.2 mmol/L, and MedlinePlus names kidney failure as the most common cause of high levels. It also lists ACE inhibitors, ARBs, potassium-sparing diuretics and too much potassium in the diet. Both cases below involved people whose kidneys couldn't keep up.

In a case report by Cheng and colleagues (2005), a 38-year-old man with kidney failure drank about 750 milliliters of raw coconut water a day for three days to quench his thirst. He reached the hospital paralyzed, with a potassium level of 8.1 mmol/L. The coconut water itself measured 44.3 mmol/L of potassium. Emergency dialysis brought his level down to 4.7 and reversed the paralysis within an hour.

In another, reported by Hemachandra and colleagues (2018), a 78-year-old man with diabetes, heart failure and badly reduced kidney function drank two to four servings of king coconut water most days for a week. He was taking losartan and spironolactone, two drugs that raise potassium. His level reached 7.02 mmol/L, his heart tracing showed changes that can come before cardiac arrest, and his arms and legs went weak. Stopping the drugs and emergency treatment brought him back without dialysis.

Who Should Not Drink Coconut Water?

Most healthy adults can drink it. These groups should talk to a doctor or dietitian first:

• People with chronic kidney disease. That's at any stage, and especially anyone on dialysis or a potassium-restricted diet.
• People taking drugs that raise potassium. That means ACE inhibitors, ARBs such as losartan, and potassium-sparing diuretics such as spironolactone. Heart failure and diabetes often come with these prescriptions, as in the case above.
• People taking potassium supplements. MedlinePlus advises talking with a provider before taking them if you have kidney disease or another long-term illness, and a daily coconut water habit adds to the total.
• Anyone dehydrated from vomiting or diarrhea. Use an oral rehydration solution instead, for the reasons in the next section.
• Anyone allergic to coconut.

Is Coconut Water Good for Dehydration?

For the mild kind, after exercise or a hot day, yes, about as good as water. For dehydration from vomiting or diarrhea, it's the wrong tool. Medical oral rehydration solutions are built around a precise balance of sodium and glucose that pulls water in through the gut. The WHO formula carries 75 mmol/L of each. The Merck Manual says sports drinks, sodas and juices don't meet that standard and shouldn't be used, because they have too little sodium and too much carbohydrate.

Coconut water fails the same test on the numbers. USDA's carton entry works out to about 11 mmol/L of sodium, roughly a seventh of the WHO level, and even the saltier fresh sample reaches only about 46. If you or your child can't keep fluids down, feel dizzy or are peeing much less than usual, use a pharmacy rehydration solution and call a doctor. For a cold or a mild stomach bug without dehydration, sipping coconut water is fine if you like it. It just isn't medicine.

How Much Coconut Water Should You Drink a Day?

There's no official limit for healthy adults. A cup a day gives you the potassium, magnesium and fluid that make it worthwhile, for about 45 calories. Past a cup or two, you're mostly adding sugar and calories that plain water wouldn't. If you have kidney disease or take one of the drugs above, the right amount may be none, and your doctor or dietitian should set it.

Coconut water counts toward your daily fluid like any other drink. If you want a personal target, our water intake calculator estimates one from your weight, exercise and climate.

What This Means for You

Coconut water is a perfectly good drink. It hydrates like water, brings more potassium than almost anything else in the cooler and carries far less sugar than juice or soda. It isn't a superfood or a medical rehydration fluid, and it doesn't replace plain water as your everyday drink. Enjoy a cup when you like the taste, choose unsweetened, and skip it if your kidneys or your medications say so.

The drink is the easy decision. The harder one is showing up for the workouts you're hydrating for, week after week, and that's where most plans fall apart. Katie put it this way: "I've tried everything. This is the first time I've stuck with something past two weeks." If consistency is your sticking point, our comparison of the best workout apps for weight loss looks at which apps help people keep training. FitCraft's 3D AI coach demonstrates each bodyweight and dumbbell exercise and says your name while you train, and streaks and leaderboards give you a reason to come back for the next session.