← All supplements
Limited evidencePhysical performance

Waxy Maize Starch

A high-molecular-weight starch marketed as a fast carbohydrate for refuelling. It leaves the stomach quickly, but trials disagree on whether that translates into better performance.

Where to buy

View on iHerb

Ships to 180+ countries · welcome discount for new customers

Referral link — this site may earn a commission on purchases.

What the science says

  • Faster refuelling in one trial Limited evidence

    A randomised trial found that a high molecular weight glucose polymer taken after exercise improved performance in a subsequent cycling bout compared with a standard glucose solution, attributed to faster gastric emptying and glycogen resynthesis.

  • No advantage as fuel during exercise Moderate evidence

    A controlled comparison found glucose polymer molecular weight did not affect exogenous carbohydrate oxidation during exercise, meaning the body does not use it any faster while you train.

  • Older starch-structure data are mixed Limited evidence

    An earlier trial comparing starch structures found differences in glycogen resynthesis that did not translate consistently into subsequent cycling performance.

Dosage & safety

Studied dose60–100 g in the hours after exercise, or 30–60 g per hour during prolonged efforts. It matters mainly when a second session follows within a few hours.
SafetyA food carbohydrate; the main issue is bloating from large single servings. It is still a rapidly absorbed carbohydrate and unsuitable as a routine choice for people managing blood glucose.

How to take it

TimingTake it in the hours after training, or sip it during efforts lasting over about 90 minutes.
With food?On its own in fluid; it is the carbohydrate, not something to take with a meal.
Worth knowingIt only earns its place when a second hard session follows within about eight hours; otherwise ordinary food refuels you just as well.

Interactions

With medications

  • insulin and other glucose-lowering medication

    A large, rapidly absorbed carbohydrate load spikes blood glucose and needs dose matching. do not use it as a routine carbohydrate source without planning it with your diabetes team

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Is waxy maize starch better than other carbs?

Waxy maize starch has limited evidence for faster refuelling from one trial, and moderate evidence that it is not used any faster than other carbohydrates as fuel during exercise. Waxy maize starch leaves the stomach quickly, but trials disagree on whether that improves performance.

When should I take waxy maize starch?

Waxy maize starch only earns its place when a second hard session follows within about eight hours; take 60–100 g after exercise, or 30–60 g per hour during efforts over about 90 minutes. Otherwise ordinary food refuels you just as well.

Is waxy maize starch OK for diabetics?

Waxy maize starch is a rapidly absorbed carbohydrate that spikes blood glucose, so it is unsuitable as a routine choice if you manage blood glucose. If you take insulin or glucose-lowering drugs, plan any use with your diabetes team.

Scientific references

Related in Physical performance