We start with the product information

Data may come from manufacturers, labels or imported records. It describes the product: its nutrients, ingredient list and preparation instructions.

The product version, flavour, market and serving size matter. Check that the details match the product you are holding.

Declared quantities
The values provided by the source, such as carbohydrates per sachet.
Calculated values
A conversion based on that data, for example from 100 g to your serving.
Glyk interpretations
What this information helps explain for your chosen effort.

A conversion needs compatible units. For a powder, the amount used and the final drink volume are needed to establish what the prepared drink provides.

We look at five criteria

Carbohydrate contribution

The amount of product needed for the chosen target. For a drink, its contribution depends on the planned volume.

Estimated digestive tolerance

Factors to watch in the amounts of fat, fibre, protein and polyols, as well as drink concentration. This estimate does not predict your personal reaction.

Practicality

The product’s format and ease of consumption on the move, with an estimate of its appeal over the duration of an effort. Your preferences may differ.

Sodium and hydration

The sodium and, for a drink, fluid contribution in the scenario being assessed. This reference point does not measure your sweat losses or individual needs.

Composition

A reference point for identified additives, based on Glyk’s own rubric. It is not a measure of harmfulness or an overall assessment of your diet.

Read a score in its context

The score out of 100 summarises the available criteria. Their relative importance varies with the duration of the effort. A partial score uses less information: read the explanations and check what data is missing, too.

For drinks, the carbohydrate score reflects the share of the target covered at the selected volume and contributes to the overall score. When no volume is planned, it uses a clearly marked 500 mL/h estimate.

These scores describe a scenario. They are not a prescribed fuelling plan and do not guarantee your personal tolerance.

A practical example

Take the Maurten Gel 100 Caf 100. Here is what the manufacturer declares for a 40 g sachet.

Per 40 g sachet

Carbohydrates
25 g
Caffeine
100 mg

Two sachets? Count 200 mg of caffeine.

That is the total for these two gels. Remember to count caffeine from your drinks and other products, too.

See the calculation and source

The manufacturer declares 250 mg of caffeine per 100 g. For one sachet: 250 mg × 40 g / 100 g = 100 mg. For two sachets: 2 × 100 mg = 200 mg.

Read the manufacturer’s product page

Source checked on .

What the data can tell you

Information may be missing

Depending on the available data, a calculation may be unavailable, a score partial or an estimate less precise. The explanations highlight these limits.

The product may change

Formulations change and two sources may disagree. If the product details differ from your packaging, check the version and report the discrepancy. Always consult your label for ingredients and allergens.

Transparency and corrections

Automated tools help process information and identify ingredients. Scores are then calculated using Glyk’s rules. This automation does not guarantee that every data point is accurate or that every product has been reviewed by a person.

Glyk receives no funding or remuneration from brands.

An error in the product details?

Email support@glyk.app with the product reference and a photo of the label. This information helps us examine the discrepancy and correct the relevant data.

Report an error by email
Read the references

This research informs some reference points in endurance nutrition. Glyk’s criteria, their relative importance and its scoring rubric remain choices made for the app; these publications do not validate its scores.

See a gel breakdown in Glyk