The so-called 'weight loss injection test' (often marketed as a DNA or biomarker test for GLP-1 receptor agonists like semaglutide) claims to predict individual efficacy or tolerability of these drugs. However, the scientific evidence is weak. No validated genetic markers have been shown in controlled studies to reliably predict weight loss response to these medications. Most offered tests rely on single SNPs (e.g., in the GLP-1 receptor gene) with small and non-reproducible effect sizes. Moreover, GLP-1 agonists are prescription drugs with potential side effects (nausea, pancreatitis, gallbladder issues). A genetic test does not replace medical indication. The decision for therapy should be based on clinical criteria (BMI, comorbidities), not on direct-to-consumer tests. The evidence is best classified as marketing, not clinically validated. Consumers should be skeptical and seek medical advice.
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