Hibiscus is popping up more and more in sports nutrition. Usually accompanied by a story about antioxidants. I don't sell that story. My complete guide to energy bars for cycling already establishes the hierarchy: fuel first, flavor second, everything else is decoration. Hibiscus falls into that second category. It provides flavor, color, and botanical depth in the Cherry/Pomegranate. Nothing more. And that is exactly what I say about it.

What is Hibiscus sabdariffa?

Hibiscus sabdariffa is a plant in the mallow family whose dried calyces are used as tea and as a food ingredient. In North Africa, this tea is called karkade; in Latin America, agua de jamaica; and in scientific literature, "sour tea." The plant has been food for centuries, not a supplement.

The calyces contain anthocyanins, organic acids, and polyphenols. Anthocyanins are the red plant pigments that give hibiscus its deep color. They are also the reason hibiscus scores high on antioxidant capacity in laboratory tests. That score in a test tube just says nothing about what happens in a cycling human.

In terms of taste, hibiscus is sharp, dry, and slightly floral. It cuts through the sweetness of concentrated fruit. That is why it is in the Cherry/Pomegranate: deep red fruit with a floral freshness that keeps the bar bright rather than sticky.

What does the research on hibiscus in athletes show?

There is one controlled study on hibiscus in athletes, and it did find a decrease in oxidative stress but no effect on muscle damage or performance. That is the full state of affairs, not a selective summary.

In 2016, Hadi and colleagues studied fifty-four male soccer players. Three groups, double-blind: 450 mg green tea extract per day, 450 mg hibiscus extract per day, or a placebo. For six weeks. The outcome: total antioxidant capacity in the blood increased and markers of oxidative stress decreased. The markers for muscle damage did not budge.

Read the dosage again. 450 mg of extract, every day, for six straight weeks. That is a supplement protocol. It is not the same as a botanical in a 25 g bar that you eat during a ride. Anyone who uses that study to sell an energy bar is stretching the conclusion far beyond the study design. I do not.

Why are more antioxidants not automatically better?

Suppressing oxidative stress during training can actually inhibit your training adaptation, because the free radicals that arise during exercise also act as signals for that adaptation.

Higgins and colleagues summarized this in 2020 for vitamins C and E. Their conclusion is uncomfortable for antioxidant marketing: outside of altitude training and very specific short-term situations, supplementation does not provide a performance gain, and high doses can block the anabolic signaling pathways you want after a hard training session.

Translated to cycling: your body creates free radicals during exercise. That is normal physiology, not damage you need to fight. It is also partly the signal on which your body gets stronger. A bar that promises to dampen that signal is promising something you do not want.

This is exactly why hibiscus remains a flavor botanical for me. I dose it for flavor and color. Not for an antioxidant number.

What actually determines your performance during exercise?

Carbohydrates determine your performance during prolonged exercise, and the strongest dose-response study lands on 90 g per hour in a 2:1 ratio of glucose to fructose.

In 2019, King and colleagues had trained cyclists ride for three hours at 60% of their VO2max, followed by a 30-minute time trial. They tested 80, 90, and 100 g of glucose-fructose per hour. 90 g per hour provided the best time trial performance. 100 g per hour was not better, on the contrary: it consumed more muscle glycogen. So more is not better, even with carbs.

The reason 90 g per hour is achievable lies in your gut. Glucose and fructose use two separate transport channels to reach your bloodstream. Opening two channels at the same time doubles your absorption capacity compared to glucose alone. That is the whole logic behind 2:1. No marketing, just how your gut works.

How to distribute 60 to 90 g of carbs per hour

Sports drink is your main source. An isotonic drink of 6 to 8% provides 30 to 60 g of carbohydrates per hour in 500 to 800 ml. On top of that, you take 1 to 2 fruit performance bars per hour, good for 20 g of carbs per 25 g bar. In the finale, a gel can be added if the intensity is high and chewing is no longer possible.

Bars do not replace your water bottle. That is the most common mistake. If you want to better understand the difference between solid and liquid, read energy bar versus energy gel: when to use what.

Which ingredients do I claim, and which do I not?

Honesty is not a virtue here, but an obligation. EU legislation does not allow health or performance claims for botanicals such as hibiscus. For me, that is not a limitation; it is the same line I drew myself.

Caffeine is the only additional ingredient in my bars with a solid file. The position stand of the International Society of Sports Nutrition (Guest, 2021) is clear about that: 3 to 6 mg per kg of body weight consistently works during endurance exercise. A BOOST bar provides 50 mg. That is a conscious, low dose for the finale, not a replacement for your caffeine strategy. The full explanation is in caffeine, sport, and performance: the science behind every watt.

Contains caffeine (50 mg). Not recommended for children, pregnant women, and caffeine-sensitive persons.

In which Eagle bar is hibiscus found?

Hibiscus is in the Cherry/Pomegranate, a flavor that is still under development and not yet in the webshop.

The flavor profile: deep red fruit with a floral freshness. Cherry provides body, pomegranate provides sharpness, hibiscus keeps the whole thing dry and bright instead of jammy. That is the function of hibiscus in that bar. The only function.

What is on the shelf today is the Pear/Lime, in two versions. The regular fruit performance bar with 20 g of carbs per 25 g. And the BOOST with the same 20 g of carbs plus 50 mg of caffeine. Both are 100% vegan, gluten-free, lactose-free, and free of artificials, produced in a certified Belgian production facility (BRCGS Food Safety, ACS).

What is the difference from other sports nutrition with hibiscus?

The biggest difference is on the label. In many bars and drinks, hibiscus is on the ingredient list next to an artificial color or flavor. The hibiscus is then the story on the front, while artificials do the work on the back.

With me, there is nothing to hide behind. No artificials. No artificial colors. The color comes from the fruit and the botanical itself. That difference in intent is also the subject of why cyclists are trading in gels for a clean-label fruit energy bar.

The second difference is in the claim. Most brands put hibiscus on the front with a promise attached. I put it in the formula without a promise. A botanical that you dose for flavor does not need a claim, and a botanical that you dose for a claim usually costs flavor.

Fuel your flight

Choose your bar based on carbs. Not on botanicals. 20 g in 2:1, combined with your water bottle, during exercise. Hibiscus is welcome to add flavor to that. I ask nothing more of it, and I promise nothing more about it.

No gel. No brick. Fuel during exercise. Period.

Choose your fuel