A large-scale genome-wide association study published in Nature in April 2026, conducted by 23andMe researchers using data from 27,885 GLP-1 medication users, identified a specific variant in the GLP1R gene the gene that encodes the primary receptor these drugs target associated with differential weight loss efficacy
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However, because retatrutide exerts a more complex overall receptor load, early data indicates that its gastrointestinal side effects may be slightly more pronounced or frequent at the highest doses than those seen with standard tirzepatide protocols
Harvard Men's Health Watch Reviewed by Howard E
Use is restricted to research settings or supervised pilot programs under the guidance of licensed healthcare professionals
Medical supervision helps: evaluate potential suitability monitor progress adjust treatment strategies identify potential side effects early support sustainable outcomes Working with an experienced provider helps ensure decisions are based on clinical insight rather than guesswork