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Lilly finds impurity in compounded version of its weight-loss drug, warns of health risks

...Nothing said about its own weight-loss drug???

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Hedley Rees
Mar 14, 2026
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Lilly warns of impurity in compounded tirzepatide with vitamin B12

Below is a recent news article from Reuters covering Lilly’s investigation into compounding companies offering cheaper versions of its weight-loss drug.

Lilly finds impurity in compounded version of its weight-loss drug, warns of health risks, By Leah Douglas, March 12, 2026

Summary

  • Lilly warns of impurity in compounded tirzepatide with vitamin B12.

  • Compounders have argued products are legal and safe

  • FDA has issued warning letters to compounders

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