You can't walk down the sports nutrition aisle of a store without running into an orange and black tub of Isostar. Hydrate & Perform has been France's best-selling isotonic drink for decades, carried by an unbeatable price and a presence in almost every club. But beyond the name recognition, does the formula really hold up against the more technical drinks that have appeared in recent years?
© Isostar, official photo used for editorial purposes
Isostar Hydrate & Perform is an isotonic drink powder you mix with water, delivering 35 g of carbs and 285 mg of sodium per 500 ml serving, fortified with magnesium and vitamin C. Value for money remains its number one selling point, with a cost per bottle often half that of premium drinks. The formula shows its limits on ultra distances, though: it contains no potassium and no BCAAs at all, which confines it to efforts of 1 h 30 min to 3 h.
With more than 50 years on the French market and nearly 300,000 servings a year according to the brand, Hydrate & Perform has nothing left to prove in terms of name recognition. It comes in five flavors (orange, lemon, cranberry, grapefruit, pineapple) and two main sizes (560 g and a 1.5 kg value tub), and it's often the first isotonic drink a beginner runner spots on the shelf or finds in a race packet.
That ubiquity raises a simple question: has the formula kept pace with the rest of the market, where brands like TA Energy, Overstims or Precision Fuel & Hydration have made complete electrolyte profiles their core selling point? The Granulated Powder technology Isostar highlights promises fast, even dissolving, but the nutritional makeup has barely changed in years.
RunMorph's advice: for regular training or a sub-5-hour marathon, Hydrate & Perform gets the job done at an unbeatable price. For an ultra beyond 4-5 hours, top it up with a potassium source (banana, salty gel) or go straight to a more complete formula like the TA Energy Boisson Isotonique, which packs a full electrolyte blend.
| Spec | Isostar Hydrate & Perform |
|---|---|
| Brand | Isostar |
| Type | Isotonic drink powder to mix with water |
| Sizes | 560 g (14 servings) and 1.5 kg value tub (37 servings) |
| Flavors | Orange, Lemon, Cranberry, Grapefruit, Pineapple |
| Preparation | 3 scoops (40 g) in 500 ml of water |
| Carbs | 35 g per 500 ml (including 28 g of sugars) |
| Sodium | 285 mg per 500 ml (about 1.1 g of salt) |
| Magnesium | 62 mg per 500 ml |
| Vitamin C | 40 mg per 500 ml (50% of the reference intake) |
| Vitamin B1 | 0.23 mg per 500 ml |
| Potassium | Not in the formula |
| BCAAs | Not in the formula |
| Price per kilo | About €19.60/kg (560 g tub) |
| Allergens | May contain gluten (barley), milk, soy |
When it comes to mixing, the Granulated Powder technology mostly delivers. An independent measurement confirms fast dissolving with no lingering clumps, even in room-temperature water. A serving takes less than a minute with a simple shake, which matters when you're filling bottles in a rush before a run.
On taste, feedback converges on a noticeably sweet profile, consistent with simple sugars making up 80% of total carbs. An independent field test notes that the orange flavor stays pleasant over a marathon, but several athletes used to long runs report a sickly feeling after several bottles in a row, especially on efforts beyond 3 hours. The same source also reports that some users deliberately cut the recommended dose to tone this down, at the cost of a lower carb intake than planned.
The electrolyte profile is where it really falls short. The complete lack of potassium stands out against most newer isotonic drinks, which include at least 100 to 150 mg per serving. On short, moderate efforts, you won't notice. On multi-hour runs with heavy sweating, several users report cramping more often than with more complete formulas, which fits the known physiological role of potassium in muscle contraction.
© Isostar, official photo used for editorial purposes
| Criterion | Isostar Hydrate & Perform | TA Energy Boisson Isotonique | SiS Beta Fuel Gel |
|---|---|---|---|
| Format | Powder to mix, 500 ml | Powder to mix, 500 to 800 ml | Gel, 60 g |
| Carbs | 35 g / 500 ml | Dual source (maltodextrin + simple sugars) | 40 g / gel |
| Electrolytes | Sodium + magnesium, no potassium | Full blend of sodium, potassium, magnesium (706 mg/serving) | Not designed for hydration |
| BCAAs | None | None | None |
| Target use | 1 h 30 min to 3 h | Training and racing, long formats | Hard efforts over 2 h |
| Price | ~€19.60/kg | Higher, premium positioning | Higher per gram of carbs |
Against the TA Energy Boisson Isotonique, Isostar loses ground on electrolyte coverage: TA Energy combines sodium, potassium and magnesium in one blend, while Isostar offers only sodium and magnesium. In return, Hydrate & Perform is far cheaper, which counts if you train several times a week. Against the SiS Beta Fuel Gel, built for aggressive carb loading in gel form rather than as a diluted drink, the comparison doesn't really hold: the two products meet different needs.
To fit Hydrate & Perform into your nutrition strategy on a RunMorph training plan, save it for sessions and races under 3 hours. On longer outings, add a banana or a salty gel to make up for the missing potassium, or alternate with broth at aid stations.
For a goal between 3 and 5 hours, the formula provides the carbs and sodium you need, at a price that lets you use it freely in training and on race day without breaking the bank.
Easy to mix and well tolerated from the bottle, Hydrate & Perform is a perfect fit for weekend rides where the goal is to avoid bonking without spending a fortune on nutrition.
Beyond 4-5 hours of effort, the lack of potassium and BCAAs becomes a real gap. You're better off switching to a more complete formula like the TA Energy Boisson Isotonique or systematically adding other sources.
Isostar Hydrate & Perform is what it has always been: a reliable, easy-to-mix and very affordable isotonic drink, built for regular training and efforts of 1 h 30 min to 3 h. Fast dissolving and good gut comfort explain why so many clubs and beginners have relied on it for decades.
The formula does show its age next to the more technical competition of recent years, though: the complete lack of potassium and BCAAs clearly limits it on ultra distances, and the very sweet profile can turn sickly on the longest runs. For regular training or races up to 3-4 hours, it remains a smart, budget-friendly choice. Beyond that, look elsewhere or supplement it wisely.
6.5/10: a safe, budget-friendly bet for regular training and efforts under 3 hours, but a dated formula if you're aiming for ultra distances.