# FDA Warning Letter: Blue Willow Biologics
> 2021-08-04 · Center for Drug Evaluation and Research · `135f825fe3a4a03f`
## Letter
- **Company:** Blue Willow Biologics
- **Posted Date:** 2021-08-04
- **Letter Issue Date:** 2021-08-03
- **Issuing Office:** Center for Drug Evaluation and Research
## Subject
Unapproved New Drug Products Related to Coronavirus Disease 2019 (COVID-19)
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*Source: [FDA Warning Letters](https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/compliance-actions-and-activities/warning-letters) · AI Analytics · CC0 1.0*