Superfuel Science + Practice
Additional content and education to follow.
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For years, Skratch has preached fueling athletes with real food, like our famous rice cakes and
delicious Anytime Energy Bars. Why? Because traditional fueling gels and high-calorie
carbohydrate drinks are too concentrated or use carbohydrate sources that digest too fast for
athletes to tolerate, causing gastrointestinal distress.
But we know athletes can’t always make, carry, or eat real food. They want convenience and
calories in a bottle that won’t make them sick. To that end, our founder, Dr. Allen Lim,
developed a solution with a formula using Cluster Dextrin - an extraordinarily complex
carbohydrate that is highly soluble but digests steadily like real food.
Cluster Dextrin is an amylopectin starch with highly branched segments that connect back to
one another to form a cyclic shape similar to muscle glycogen. This similarity is a result of
applying Branching Enzyme (the same enzyme responsible for glycogenesis) to waxy corn starch
to make a highly branched cyclic dextrin (1). The net result is a carbohydrate that is
extraordinarily soluble but still slow to digest (2). Much of this is explained by Cluster Dextrin’s
large size. A single molecule contains between 60 to 70 glucose units, at an average molecular
weight of 10,548 grams per mole, with a Dextrose Equivalent of 1.7 (3). In contrast, a long chain
amylose starch like maltodextrin, which is the most common form of carbohydrate in gels and
high-calorie drinks, only contains between 3 to 20 glucose units, at an average molecular
weight of 2,000 grams per mole, with a Dextrose Equivalent of 8-10 (3).
Cluster Dextrin’s properties enabled us to make Superfuel – a drink mix with a viscosity close to
water, that is energy dense, and steadily digested. It’s designed for athletes who push so hard
that they can’t take in enough calories from real food to maintain their performance.
One 500 ml serving provides 100 g of carbohydrate (92 grams from Cluster Dextrin + 8 grams
from fructose) and 400 mg of sodium from sodium citrate, providing 400 Kcals at an osmolality
of 150 mOsmol/kg (3). This is significantly lower than blood (280-290 mOsmol/kg), helping to
maximize water transport by both osmosis and sodium-glucose co-transport. Given this
extremely low osmolality, Superfuel is an extremely flexible fuel and hydration source which
can be used at lower or higher concentrations depending on the workload and caloric need.
While there is existing literature showcasing incredible performance gains with Cluster Dextrin
in both humans (4) and animals (5) as well as literature showing alleviation of gastro-intestinal
distress (6), we wanted to prove it to ourselves before making Superfuel available to the public.
To that end, we worked for nearly two years with some of the world’s greatest athletes,
including Olympic Gold Medalist Triathlete, Gwen Jorgensen, and the EF Education First Pro
Cycling Team to prove that the science matched real world practice. The consensus from these
athletes is that Superfuel is the best liquid carbohydrate source available.
To Use: Add 7 scoops (105 g) to 8 fl oz water. Shake vigorously. Add an additional 8-12 fl oz of
water and hake again. For best results, let sit for 5 to 15 min before use. That said, you can
always use more or less depending on your personal response and caloric needs.
Is 400 calories in a serving the right amount for me?
Probably not, not unless you are exercising at an intensity where you are burning close to 1000 Calories per hour or are exercising for more than 3 hours. That said, 400 Calories is 400 Calories, so think of Superfuel as an easy way to carry a lot of Calories to meet whatever your needs are. Ultimately, we recommend that you try and replace about 1/2 the calories you burn per hour to maintain your blood sugar levels and to make sure you don't run out of carbohydrate in your muscle (glycogen). Depending upon your fitness and intensity, 400 Calories may or may not be enough for you. So just think of this as a convenient way to get what you need without upseting your gut. Don't think of this as what you have to consume.
Do I need a separate bottle of Sport Hydration Drink Mix?
One serving of Superfuel provides the equivalent amount of hydration as one serving of SHM. That said, 1 bottle or about 1/2 liter may not be enough to replace your fluid losses from sweat. So if you do need more hydration beyond one bottle, then our Sport Hydration Mix still fits the bill. Realize that optimal hydration and optimal fueling are not the same thing. We don't always lose calories in proportion to the fluid we lose. On hot days, you may not even need Superfuel if you are using our Sport Hydration Mix at a rate that matches your fluid losses, because you may lose so much fluid that a bottle with less calories gives you the same total number of calories. On cooler days, you may find that you're burning the same amount of energy but not sweating as much, so based on your calorie needs and lower fluid needs, a higher calorie Superfuel bottle is all that is needed. Think of Superfuel and our Sport Hydration Drink Mix as two very different types of tools. It's not that one is better than the other. One is a big hammer without a lot of fluid. The other is a little hammer with a lot more fluid.
How is this used?
This is a really flexible product in that you can lower the amount depending on weather, activity, etc.
The directions to use listed on the bag are: Add 7 scoops to 8 fl oz of water. Shake vigorously. Add remaining 8-12 additional fl oz of water and shake again. For better mixing, let sit for 15 minutes before use.
How you use it all just depends on how many calories you need to take in and how much water you want to drink to get those calories.
Additionally, the athletes we work with like using the Superfuel in conjunction with our drink mix. Not because Superfuel doesn’t have the right amount of electrolytes for a 100 gram or 400 kcal serving, but because in the heat, they lose more water and sodium than they burn calories. If you used Superfuel to replace both your calories and your fluid/electrolyte loss in the heat, you’d end up consuming too many calories. That said, in the cold, where fluid needs are not as great, the athletes we work with found that they would use less of our sport hydration mix, because their fluid needs were lower, but they’d use the same amount of Superfuel since their energy output was still the same.
The combination you use will be weather and exercise intensity dependent. Hot weather, less Superfuel and more sport hydration. Cold weather, maybe a little more Superfuel and less sport hydration. Think of it as food when you don't have or can't chew food.
Max scoops per bottle?
For a 16 ounce bottle, the maximum number of scoops I would recommend is 7 scoops. Said differently, I would not recommend more than 100 grams of total product in a 16 ounce bottle (and no more than 100 grams per hour). Most athletes we work with, only put 80 grams or about 6 scoops in a 16.9 oz bottle. 7 scoops or 100 grams is max, though I’ve heard of some folks putting anywhere from 10 to 14 scoops in (140 to 200 grams). Finally, note that as this powder settles, a scoop might weigh more than the 14 ish grams of one of our scoops. So always best to use a scale to calibrate how you scoop!
Why so expensive?
We weren’t swayed by the price of the ingredients when deciding to make this product. Our intent was simply to solve the problem.
We have found the carbohydrate we are using has more science backing it than standard maltodextrin or maltodextrin formulas. But we encourage folks to use whatever works best for them, so if you have something you like, we encourage you to use that. We also encourage folks to use real food when possible this was made for when you can't chew or access food.
Food for thought in terms of $ per calorie. Superfuel is 40 bucks for 3200 calories. A 24 pack of gels from a different brand is regularly 60 bucks for 2400 calories.
So maybe not an everyday training product but something for the arsenal on big event days.
If this is designed for big efforts how should we test it?
Always use and become comfortable with any sports nutrition you use in training before using it in a big event. While it is designed for really hard and long days, you can use less of it on easier days just to get familiar with the taste and get a feel for how it impacts performance. Ultimately, this drink was designed to replace food when it’s not possible to eat food. It’s not just for extraordinary days.
What is the texture and taste like?
The viscosity is very close to plain water when fully dissolved, we think having something that is highly caloric that isn’t sticky, overly sweet, or thick is great option for athletes.
If I heat it up to consume warm will that effect the structure and use of this? What about Freezing it?
The structure changes as soon as digestion begins and glucose molecules begin breaking off of it like passengers getting out of a car. But, because of its larger more complex structure, the digestion is slower and more steady. So instead of 16 cars showing up at the gates of Disneyland and 4 people getting out of each car through one door at once to cause a huge line that put pressure at the ticket line, HBCD gives us one bus with 64 people on it that lets each person off one at a time through one door. This reduces pressure at the ticket line as individual people or glucose sugars are let into the body (aka Disneyland).
It depends on the temperature. If you boil it, the structure may change. But, at normal bottle temp it will not change without the digestive enzymes amylase and glucosidase.
We would suggest trying it heated (not boiled) and seeing how it compares for you when not heated, if it did begin to breakdown earlier heated it would worst-case sit in the stomach longer. - which for some people might be ok and for some might cause GI distress.
Superfuel can be frozen, the only way to damage the cluster dextrin/damage the bonds is with a lot of heat/ or the enzymes amylase and glucosidase.
1. Takata, H., Takaha, T., Nakamura, H., Fujii, K., OKADA, S., Takagi, M., &
Imanaka, T. (1996). Production and some properties of a dextrin with a narrow
size distribution by the cyclization reaction of branching enzyme. Journal of
Fermentation and Bioengineering, 84(2), 119–123. http://doi.org/10.1016/S0922-
2. Lee, B.-H., Yan, L., Phillips, R. J., Reuhs, B. L., Jones, K., Rose, D. R., et al.
(2013). Enzyme-Synthesized Highly Branched Maltodextrins Have Slow Glucose
Generation at the Mucosal α-Glucosidase Level and Are Slowly Digestible In
Vivo. PloS One, 8(4), e59745. http://doi.org/10.1371/journal.pone.0059745
3. Osmolality measures made using an EliTech Vapro® Vapor Pressure
Osmometer at the Applied Exercise Science Laboratory at the University of
Colorado at Boulder, 2020.
4. Shiraki, T., Kometani, T., Yoshitani, K., Takata, H., & Nomura, T. (2015).
Evaluation of Exercise Performance with the Intake of Highly Branched Cyclic
Dextrin in Athletes. Food Science and Technology Research, 21(3), 499–502.
5. Takii, H., Ishihara, K., Kometani, T., Okada, S., & Fushiki, T. (2014).
Enhancement of Swimming Endurance in Mice by Highly Branched Cyclic
Dextrin. Bioscience, Biotechnology, and Biochemistry, 63(12), 2045–2052.
6. Takii, H., Kometani, T., Nishimura, T., Kuriki, T., & Fushiki, T. (2007). A Sports
Drink Based on Highly Branched Cyclic Dextrin Generates Few Gastrointestinal
Disorders in Untrained Men during Bicycle Exercise. Food Science and
Technology Research, 10(4), 428–431. http://doi.org/10.3136/fstr.10.428