Cluster Dextrin™ – what is it and why is it used in dietary supplements?

Cluster Dextrin™ is a patented form of Highly Branched Cyclic Dextrin (HBCD) used in dietary supplements to provide fast and steady energy without gastric discomfort. It is developed by Glico Nutrition in Japan and is one of the most advanced carbohydrate sources on the market.

But what makes Cluster Dextrin™ unique compared to common carbohydrates like maltodextrin or dextrose? And why does Skytrition choose to use it in CarbUP?

Here we go through everything you need to know.

What is Cluster Dextrin™?

Cluster Dextrin™ is a trademarked name for Highly Branched Cyclic Dextrin (HBCD), produced through the enzymatic treatment of amylopectin – a component of starch. The process creates a unique cyclic molecular structure with high molecular weight and low osmolality.

It is precisely the combination of high molecular weight and low osmolality that makes Cluster Dextrin™ so interesting for athletes.

What do high molecular weight and low osmolality mean?

Molecular weight affects how quickly a carbohydrate passes through the stomach into the small intestine. High molecular weight = faster gastric emptying.

Osmolality is a measure of how many particles are in a solution. Low osmolality means the solution does not draw as much water into the stomach, which reduces the risk of gastric discomfort and bloating.

Compared to common carbohydrates:

• Maltodextrin – high osmolality, can cause gastric discomfort at high doses
• Dextrose (glucose) – very high osmolality, rapid blood sugar spike
• Cluster Dextrin™ – low osmolality, fast gastric emptying, steady energy release

How does Cluster Dextrin™ work in the body?

Thanks to its unique molecular structure, Cluster Dextrin™ passes quickly through the stomach and is absorbed in the small intestine. This provides:

• Fast energy availability – glucose is delivered to the muscles without delay
• Steady energy release – without the sharp blood sugar spikes and crashes that simple sugars cause
• Minimal gastric discomfort – low osmolality reduces the risk of bloating and nausea during training
• High solubility – dissolves easily in water without clumping

Cluster Dextrin™ for endurance and intra-workout

Cluster Dextrin™ is particularly popular as an intra-workout carbohydrate – that is, a carbohydrate source consumed during training. The reason is simple: you need energy quickly and without stomach problems in the middle of a session.

It is also used as a pre-workout carbohydrate to top up glycogen stores before long or intense sessions, as well as post-workout for rapid glycogen replenishment.

Cluster Dextrin™ compared to other carbohydrates

• vs. Maltodextrin – Cluster Dextrin™ has lower osmolality and provides steadier energy with less risk of gastric discomfort
• vs. Dextrose/glucose – Cluster Dextrin™ provides a steadier blood sugar curve without sharp spikes and crashes
• vs. Oats/complex carbohydrates – Cluster Dextrin™ is absorbed faster and is easier on the stomach during training
• vs. Waxy Maize – Cluster Dextrin™ has better solubility and faster gastric emptying

When is it best to take Cluster Dextrin™?

• Before training – 30–60 minutes before to replenish glycogen stores
• During training (intra-workout) – for continuous energy supply during long sessions
• After training – for rapid glycogen replenishment in combination with protein

In which Skytrition products is Cluster Dextrin™ found?

Cluster Dextrin™ is used in:

• CarbUP – Carbohydrates – an advanced carbohydrate product with Cluster Dextrin™, Carb10®, and GlycerSize™ for optimal energy, hydration, and performance

What should you consider when choosing products with Cluster Dextrin™?

1. The dosage

Check how much Cluster Dextrin™ is included per serving. An effective dose is usually 25–50 g depending on training intensity and body weight.

2. The combination with other carbohydrates

Cluster Dextrin™ is often combined with other carbohydrate sources for a broader absorption spectrum. In CarbUP, it is combined with Carb10® for even steadier energy release.

3. Fluid intake

Despite low osmolality, it is important to drink enough water for optimal absorption and hydration during training.

Common questions about Cluster Dextrin™

What is Cluster Dextrin™?
Cluster Dextrin™ is a trademarked name for Highly Branched Cyclic Dextrin (HBCD), developed by Glico Nutrition in Japan.

Why is Cluster Dextrin™ better than maltodextrin?
Cluster Dextrin™ has lower osmolality, which means faster gastric emptying and less risk of gastric discomfort compared to maltodextrin.

Can you take Cluster Dextrin™ during training?
Yes, it is one of the best carbohydrate sources for intra-workout use due to fast gastric emptying and low osmolality.

In which Skytrition products is Cluster Dextrin™ found?
Cluster Dextrin™ is included in CarbUP.

How does Cluster Dextrin™ taste?
Cluster Dextrin™ is almost tasteless and dissolves easily in water, making it easy to combine with other ingredients.

Summary

Cluster Dextrin™ is a patented highly branched cyclic dextrin with low osmolality and fast gastric emptying. It delivers steady and fast energy without gastric discomfort – ideal for intra-workout use and demanding training sessions.

It is included in Skytrition's CarbUP along with Carb10® and GlycerSize™ for a complete carbohydrate and hydration formula.

More ingredient guides

Do you want to read more about other patented ingredients in Skytrition's products?

• AstraGin® – the absorption enhancer that helps the body absorb nutrients better
• GlycerSize™ – high-concentration glycerol for pump and hydration in CarbUP
• DigeZyme® – multi-enzyme complex for optimal digestion and protein absorption