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Carbs vs protein: no extra muscle gains found

NCT ID NCT07600138

Knowledge-focused Sponsor: Auburn University Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at whether adding extra carbohydrates to a daily protein supplement helps resistance-trained men build more muscle and strength. Twenty-five men took either a protein-only or a protein-plus-carb supplement for 8 weeks each. The results showed no significant difference in muscle size, strength, or endurance between the two groups, suggesting that modest extra carbs may not enhance training outcomes.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Whey protein and maltodextrin (carbohydrate) supplement
What this could lead to
If confirmed, this could help refine nutrition guidelines for resistance training, showing that extra carbs beyond protein may not improve muscle gains.
What could go wrong
This was a small study (25 men) with trained participants only, so results may not apply to beginners or women. The modest carb increase may not be enough to see effects.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

25 people

The number who actually took part.

Started

May 2025

Finished

Sep 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 40 years

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Male sex * Aged 18-40 years * BMI not exceeding 35 kg/m² * Minimum of two years resistance training experience * Resistance training frequency of at least four days per week * No known allergy to whey protein supplements Exclusion Criteria: * Known cardio-metabolic disease (e.g., clinical obesity, diabetes, hypertension, heart disease) * Any condition contraindicating participation in resistance training * Known allergy to whey protein supplements

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Conditions

The condition(s) this trial relates to.

myostatin-related muscle hypertrophy

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Muscle hypertrophy Strength

Contacts and locations

Locations

  • School of Kinesiology

    Auburn, Alabama, 36879-5432, United States

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