And then I think she thought, 'Hey, wait a second, maybe I'll try to go back and play competitive tennis.'" McEnroe points to the World Anti-Doping Organization announcing it was studying GLP-1s to see if athletes were abusing it, which is why so many people are drawn to Williams' story
Wei, Microchimica Acta 186, (2019)
Variants in the GLP1R gene (such as rs6923761) affect receptor expression and sensitivity, potentially determining whether your stomach responds to GLP-1 with significant slowing or minimal change
Responses of criterion variables to different supplemental doses of L-carnitine L-tartrate
Pickart and Margolinas 2018 review in Int J Mol Sci catalogs its regenerative and protective actions matrix remodeling, antioxidant and anti-inflammatory gene modulation, and wound-repair signaling but this is a review of largely preclinical and cell-based work (PMC6073405)
It will also tell you whether you have one or two of the gene variants