Retatrutide · research summary

Detection and Excretion Profile of Retatrutide in Human Plasma and Urine by LC-HRMS: Implications for Antidoping Analysis.

Rapid communications in mass spectrometry : RCM · 2026. Summary drawn from the study's full text. Each statement is followed by the exact sentence it comes from. This is a research summary, not medical advice.

Study type

Elimination study and method validation for retatrutide detection in human plasma and urine
“An elimination study was conducted with four healthy volunteers (n = 4; 2 males, 2 females; mean age 36.8 ± 7.4 years) to characterize the concentration‐time profiles of retatrutide in plasma and urine after administration.”

Subjects

Four healthy volunteers (2 males, 2 females) with a mean age of 36.8 years
“An elimination study was conducted with four healthy volunteers (n = 4; 2 males, 2 females; mean age 36.8 ± 7.4 years) to characterize the concentration‐time profiles of retatrutide in plasma and urine after administration.”

Sample size

4 volunteers
“An elimination study was conducted with four healthy volunteers (n = 4; 2 males, 2 females; mean age 36.8 ± 7.4 years) to characterize the concentration‐time profiles of retatrutide in plasma and urine after administration.”

Reported findings

Neither intact retatrutide nor metabolite-derived signals were detected in urine samples
“Neither intact retatrutide nor metabolite‐derived signals were detected in urine samples throughout the entire collection period, despite systematic application of multiple extraction strategies.”

Limitations stated by the authors

Small sample size limits generalizability of pharmacokinetic profiles
“First, the small sample size (n = 4) limits the generalizability of the presented pharmacokinetic profiles, and greater interindividual variability may be observed in a larger population.”
Plasma concentrations are semi-quantitative estimates derived from single-point calibration
“Third, the reported plasma concentrations should be regarded as semi‐quantitative estimates, as they were derived from single‐point calibration rather than a full calibration curve.”

Source: PubMed 42745421 · DOI 10.1002/rcm.70179 · all study summaries

Study type

Elimination study and method validation for retatrutide detection in human plasma and urine

“An elimination study was conducted with four healthy volunteers (n = 4; 2 males, 2 females; mean age 36.8 ± 7.4 years) to characterize the concentration‐time profiles of retatrutide in plasma and urine after administration.”

Subjects

Four healthy volunteers (2 males, 2 females) with a mean age of 36.8 years

“An elimination study was conducted with four healthy volunteers (n = 4; 2 males, 2 females; mean age 36.8 ± 7.4 years) to characterize the concentration‐time profiles of retatrutide in plasma and urine after administration.”

Limitations stated by the authors

Small sample size limits generalizability of pharmacokinetic profiles

“First, the small sample size (n = 4) limits the generalizability of the presented pharmacokinetic profiles, and greater interindividual variability may be observed in a larger population.”

Plasma concentrations are semi-quantitative estimates derived from single-point calibration

“Third, the reported plasma concentrations should be regarded as semi‐quantitative estimates, as they were derived from single‐point calibration rather than a full calibration curve.”