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Effects of Dietary Supplements on Muscle Mass and Function While Using GLP-1 Medication

Sponsor: University of California, Los Angeles • ClinicalTrials.gov ID: NCT07806838

Registry updated: 2026-09-08

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Description

This pilot study will examine whether daily protein supplementation with or without a mixture of culinary spices can help preserve muscle mass and function in adults who are using GLP-1 medications for weight management. The study will include 75 adults who recently started a GLP-1 medication and are experiencing weight loss. Participants will be randomly assigned to one of three groups: standard of care, protein supplementation plus placebo capsules, or protein supplementation plus mixed spice capsules. The study will last 6 months. Researchers will compare changes in muscle mass and muscle function among the groups. Muscle mass will be measured using DEXA and D3-creatine enrichment. Muscle function will be assessed using walking, stair-climbing, and grip-strength tests. The study will also evaluate metabolic and inflammatory markers, body composition, dietary intake, physical activity, fatigue, sleep quality, quality of life, and other measures related to muscle health.

Interventions

Whey Protein Supplementation (Dietary supplement)
Participants will receive Nutrasumma 100% Whey Protein Isolate (unflavored), providing 20 g whey protein isolate per serving. The 20 g of protein from the shake will count toward the total daily protein goal of 1.2 g/kg lean body mass/day. The remaining protein target will be met through the participant's usual diet.
Maltodextrin Placebo Capsules (Dietary supplement)
Participants will consume placebo capsules containing 4 g of maltodextrin daily for 6 months.
Mixed Spice Capsules (Dietary supplement)
Participants will consume 4 g of mixed spice capsules daily for 6 months. The daily mixture contains 1.0 g turmeric, 1.5 g cinnamon, 0.5 g oregano, 0.5 g black pepper, 0.3 g sage, and 0.2 g thyme.

Eligibility criteria

Inclusion Criteria: 1. Male or female ≥18 years of age at screening visit. 2. BMI \>27 kg/m² with weight-related conditions OR BMI \>30 kg/m². 3. Taking any FDA-approved GLP-1 medication, daily oral or weekly injectable, started up to three months ago, and experiencing at least 1 lb of weight loss per week. 4. Screening laboratory tests without significant abnormalities that might interfere with the study. Exclusion Criteria: 1. Consume spices regularly \>5 g/day. 2. Allergy or sensitivity to spices, or history of allergy or anaphylaxis of any kind. 3. Diagnosed with Type 2 diabetes. 4. Vegans/vegetarians. 5. Consuming protein, amino acid, or creatine supplements; occasional or infrequent use (1 serving per week or less) is allowed. 6. Milk protein allergy. 7. Severe lactose intolerance. 8. Current diagnosis of alcoholism or substance addiction. 9. Uncontrolled hypertension (systolic BP \>170 or diastolic BP \>100). 10. Eating a high-fiber/polyphenol diet or taking medication or dietary supplements that interfere with the absorption of polyphenols. 11. Frequently using prebiotics, probiotics, yogurt, and/or fiber supplements. 12. Pregnant, breastfeeding, or unwilling to practice birth control during study participation. 13. Presence of a condition or abnormality that, in the opinion of the investigator, would compromise participant safety or data quality. 14. Renal impairment measured as eGFR \<45 mL/min/1.73 m² (\<60 mL/min/1.73 m² in subjects treated with SGLT2i), according to the CKD-EPI creatinine equation as defined by KDIGO 2012. 15. Any unstable medical conditions or terminal diagnosis. 16. Unstable thyroid disease-not taking medication or medication dosage changed one or more times over the last 6 months. Stable thyroid disease on an unchanged prescription medication dose for ≥6 months is acceptable. 17. Current use of insulin or oral medication of metformin, SU, SGLT2i, glitazone, or DPP4 as single-agent therapy or combination oral agents. 18. Taking GLP-1 medications for more than 3 months. 19. Have a medical implant or other metal implant, including a pacemaker. 20. Unwilling to stay on a GLP-1 medication for 6 months or for the duration of study participation.

Conditions

Obesity & Overweight Muscle Mass and Strength Muscle Function

Locations

UCLA Center for Human Nutrition — Los Angeles, California, United States

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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

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