Home / Food and drink

Coconut water: USDA nutrition and what hydration research shows

By the Life in Good Form editors. Updated 2026-10-15.

We research products from makers' specs and health sources; we do not run hands-on tests. Links to Amazon may earn us a commission at no cost to you. How this works.

Nutrition per 100 grams

Details are from two USDA FoodData Central entries analyzed separately. Values vary by brand and by the coconut, so check the Nutrition Facts panel on the carton you buy.

Fresh vs packaged coconut water

The two USDA entries show how much coconut water can vary. The entry for liquid straight from coconuts lists 250 mg of potassium and 105 mg of sodium per 100 grams, while the unsweetened ready-to-drink entry lists 165 mg of potassium and 26 mg of sodium. Magnesium is also higher in the fresh entry. These are separate samples rather than a direct before-and-after test, but they are a good reminder that one brand or coconut may differ from another, so the label on your carton is the number that counts.

What hydration studies found

In a 2012 study in the Journal of the International Society of Sports Nutrition, 12 exercise-trained men did a 60-minute dehydrating treadmill session, losing about 1.7 kg (about 2% of body mass), then drank bottled water, pure coconut water, coconut water from concentrate or a sports drink on separate days. All four regained the lost weight in a similar way, there were no differences in fluid retention between coconut water and the sports drink, and treadmill performance afterward did not differ significantly. Some participants had more stomach upset with coconut water.

A 2007 study of 10 men who exercised in the heat to lose 3% of body weight found that sodium-enriched fresh coconut water was as good as a commercial sports drink for whole body rehydration, with better fluid tolerance. Plain coconut water fell between water and the sports drink.

In that 2007 study, rehydration indexes were 58% for plain water, 65% for plain coconut water, 68% for the sports drink and 69% for sodium-enriched coconut water, and participants were still somewhat dehydrated after the 2-hour rehydration period in all trials.

What this means for you

For everyday thirst and moderate exercise, water works well, and these studies suggest coconut water, water and sports drinks perform similarly in young healthy men. Coconut water is relatively high in potassium and, in packaged form, low in sodium; after long, sweaty sessions where you lose a lot of salt, a drink with more sodium may be a better match. See our electrolyte tablets guide and electrolyte drink powder guide.

Choosing a coconut water

• Unsweetened. Check the ingredient list for added sugar or juice blends.
• 100% coconut water vs from concentrate. Both were tested in the 2012 study; the label will say which you are buying.
• Compare potassium and sodium per serving on the Nutrition Facts panel.
• Size. Single-serve cartons help with portions; larger cartons need refrigeration after opening.

Who should be careful

Because coconut water contains potassium, people with kidney disease or who take medicines that raise potassium should ask their doctor before drinking it regularly. If you are watching sugar or calories, count it like any other drink. Stop if it upsets your stomach, as some participants in the 2012 study reported.

For children with diarrhea or vomiting, ask a pediatrician about an oral rehydration solution rather than relying on coconut water.

Ways to use coconut water

• Drink it chilled after a workout or on a hot day.
• Use it as a smoothie base instead of juice.
• Freeze it into ice cubes for water or smoothies.
• Mix with chia seeds for a simple pudding; see our chia seeds guide.

For a bottle that tracks your water intake, see our smart water bottle guide.

What to look for when you buy

Questions people ask

Is coconut water better than water for hydration?

In a 2012 study, coconut water, water and a sports drink rehydrated trained men similarly.

How much potassium is in coconut water?

USDA lists 165 mg per 100 grams for unsweetened ready-to-drink coconut water.

Is coconut water better than a sports drink?

Studies found similar rehydration; sodium-enriched coconut water matched a sports drink in a 2007 study.

Does coconut water have sugar?

It has natural sugars; USDA lists 4.24 g carbohydrate per 100 grams unsweetened.

Who should avoid coconut water?

People with kidney disease or on potassium-raising medicines should ask a doctor first.

Is fresh coconut water different from packaged?

USDA entries list 250 mg potassium and 105 mg sodium per 100 grams for fresh, versus 165 mg and 26 mg for packaged unsweetened.

Sources

• Beverages, Coconut water, ready-to-drink, unsweetened (FDC 174831) (USDA FoodData Central, FDC ID 174831), USDA FoodData Central
• Nuts, coconut water (liquid from coconuts) (FDC 170174) (USDA FoodData Central, FDC ID 170174), USDA FoodData Central
• Comparison of coconut water and a carbohydrate-electrolyte sport drink on measures of hydration and physical performance in exercise-trained men (pubmed.ncbi.nlm.nih.gov), Journal of the International Society of Sports Nutrition (PubMed 22257640)
• Rehydration with sodium-enriched coconut water after exercise-induced dehydration (pubmed.ncbi.nlm.nih.gov), Southeast Asian Journal of Tropical Medicine and Public Health (PubMed 17883020)

Sources checked 2026-10-15.