Some products cross the decades without ever going out of style. The Overstims Gel Coup de Fouet is one of the rare staples French runners have kept in their belts since the 1990s, not out of nostalgia, but because it works. With its new 34 g pouch and 26 g of carbs per serving, the Coup de Fouet remains the best-known instant energy shot on the French market. Here is our full review.
© Overstim.s, official photo used for editorial purposes
The Gel Coup de Fouet from Overstim.s delivers 26 g of carbs in a liquid, acid-free pouch, ideal for tough sections on the trail or for surges late in a marathon. Its royal jelly and vitamin B6 formula targets fatigue, with no high-tech pretensions. At €2.70 a gel and made in France, it's the best value for money on the performance gel market.
Overstim.s was founded in the 1980s, long before sports nutrition became a mass market. The French brand developed the Gel Coup de Fouet to meet a simple need: give runners an immediate energy hit at the key moments of a race, on the climbs, through the tough sections, and when the finish line refuses to show up. For 30 years, the product came in a soft tube. In 2024, the brand switched to a more compact 34 g pouch, with 20% more energy than the old 30 g tube.
This format change matters. The pouch slips more easily into a trail vest pocket, fits in a running belt and creates less plastic waste than an individual tube. At RunMorph, we see this environmental move as a plus, and it comes at no cost to performance.
| Brand | Overstim.s |
|---|---|
| Product | Gel Coup de Fouet |
| Format | 34 g pouch |
| Carbs per serving | 26 g (100 kcal) |
| Texture | Liquid |
| Active ingredients | Glucose syrup, royal jelly (0.3%), açaí, acerola, vitamins B1 and B6 |
| Flavors | Red Berries, Lemon, Cola, Orange |
| Gluten-free | Yes |
| Preservative-free | Yes |
| Acidity | None |
| Made in | France |
| Unit price | ~€2.70 |
| 10-gel pack | ~€27 |
© Overstim.s, official photo used for editorial purposes
The Coup de Fouet is built on a fast-absorbing glucose syrup. Where other brands blend optimized glucose/fructose ratios, Overstims bets on a single carbohydrate that is absorbed right away. On paper, that approach has less scientific backing, but it keeps the formula simple and contributes to the product's very good gut tolerance.
Royal jelly (0.3%) has long been associated with vitality in French tradition. The dose is modest, but vitamins B1 (thiamine) and B6 add recognized EFSA claims on reducing fatigue during intense activity. These vitamins genuinely contribute to cellular energy metabolism.
The complete absence of acidity is a big plus for runners with sensitive stomachs. Many gels on the market contain concentrated lemon or apple juice which, after 3 or 4 servings on an ultra, irritates the stomach lining. The Coup de Fouet avoids that problem by design.
RunMorph tip: on a 5-hour trail run, alternate the Coup de Fouet (a quick boost on the climbs) with a solid bar such as the Baouw Extra every 45 minutes. These two French products complement each other perfectly on the digestive side.
We tested the Gel Coup de Fouet on trail runs ranging from a straight 800 m elevation-gain climb to 5- to 6-hour long runs on technical terrain. The liquid texture makes it far easier to take on the move. No chewing, no thick gel sticking to the roof of your mouth. The brand recommends a small sip of water, but on short runs or in cool weather the gel goes down on its own without any discomfort.
You feel the effect within 3 to 5 minutes. On a 10-13% climb where your legs start losing their snap, the energy lift is clear. This is a gel for a targeted boost, not for steady fueling. It doesn't replace a continuous carb drink, but it complements it perfectly at the moment you need it most.
Over 4 to 5 consecutive servings (100 km of trail), we noted no stomach discomfort, even at a sustained pace. The pouch fits in the chest pocket of a standard vest and tears open easily with a gloved hand.
© Overstim.s, official photo used for editorial purposes
| Gel | Carbs | Format | Key feature | Unit price |
|---|---|---|---|---|
| Maurten Gel 160 | 40 g | 40 g pouch | Hydrogel, long-lasting absorption | ~€3.50 |
| Naak Ultra Energy Gel | 27 g | 35 g | BCAAs + caffeine, ultra-trail | ~€3.50 |
| Overstims Coup de Fouet | 26 g | 34 g pouch | Royal jelly, made in France, acid-free | ~€2.70 |
Compared with the Maurten Gel 160, the Coup de Fouet is cheaper and tastes better (natural flavors vs. the unflavored Maurten). The Maurten delivers 40 g of carbs as a hydrogel and is better documented on runs over 3 hours. The two work together: Maurten for continuous fueling, Coup de Fouet for the critical moments.
Against the Naak Ultra Energy Gel, the Overstims is simpler (no BCAAs or caffeine), cheaper, and its thin liquid texture is easier to take on a hard climb. The Naak excels on night ultras thanks to its caffeine; the Coup de Fouet is the natural choice for daytime trail races and marathons with no added stimulant.
The Gel Coup de Fouet meets a specific need: a targeted boost on the tough sections. It is not a gel for continuous fueling. Here are the runners it suits best:
The Overstims Gel Coup de Fouet is exactly what it claims to be: an instant energy shot with no scientific frills, at an unbeatable price. It isn't the most carb-loaded gel on the market, nor the most clinically documented. But it is the one that goes down best on every kind of terrain, in every kind of weather, for every type of runner.
Its main strength is digestibility. On 5- to 8-hour trail runs, when your stomach eventually starts to rebel, the Coup de Fouet stays down while other gels bring on nausea. The liquid texture and lack of acidity make a real difference on race day. At €2.70 a gel, it is the best value for money on the performance gel market in France.
RunMorph score: 8/10