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Soy vs whey: which protein builds more muscle in teen soccer stars?

NCT ID NCT07571720

Disease control Sponsor: Antonio Molina Lopez Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether plant-based protein (soy and rice) works as well as animal-based protein (whey) for building lean muscle in 25 elite male youth soccer players aged 16-18. Over 4 weeks, players took a protein drink after training. Researchers measured changes in fat-free mass using body scans and other methods.

What this could mean

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

Active substance
Plant-based protein (soy and rice blend) and animal-based protein (whey)
What this could lead to
If it works, this could show that plant-based protein is as effective as whey for building lean muscle in young athletes.
What could go wrong
This is a small, short-term study in a specific group, so results may not apply to other populations or longer use.

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

Jan 2026

Finished

Mar 2026

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

16 to 19 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: * Active contract with Udinese Calcio's Primavera (U-19) category during the 2025-2026 season * Regular participation in the team's technical-tactical and strength training program (minimum 4 sessions per week) * Signed informed consent (parental consent for participants under 18 years) * Commitment to adhere to measurement protocol requiring 8-hour fast and assessment at 07:00h * Commitment to adhere to post-training supplementation protocol with administration at 17:00h * Confirmed presence and availability for both baseline assessment (Week 0) and final assessment (Week 4) Exclusion Criteria: * Open injury records or currently in functional readaptation phase at study initiation * Consumption of ergogenic or nutritional supplementation independently and external to the club-supervised protocol during the 4 weeks prior to study or during the study period * Previous diagnosis or current symptomatology compatible with eating disorders * Known allergies or intolerances to soy, rice, dairy-based proteins, or vanilla flavoring * Current use of medications that may affect body composition or protein metabolism (anabolic steroids, growth hormone, corticosteroids, thyroid hormones) * Diagnosed chronic diseases that may affect protein metabolism or body composition (diabetes mellitus, chronic kidney disease, liver disease, malabsorption syndromes)

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As listed by the trial registrant

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

Athletic performance enhancement Body composition optimization Nutritional supplementation in athletes

Contacts and locations

Locations

  • Udinese Calcio

    Udine, Udine, 33100, Italy

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