A young woman has died after receiving an anti-ageing injection at a wellness clinic in the Bronx, New York, police have said. The serum involved is reportedly the same NAD+ treatment favoured by celebrities including Kendall Jenner, raising fresh concerns about the safety of unregulated "wellness" injections marketed on the back of celebrity endorsement.

Details of the incident remain limited, but police say the woman collapsed or was fatally affected while in the treatment chair at the doctor's practice, prompting an investigation into what caused her death. The case is likely to intensify scrutiny of anti-ageing IV and injectable treatments, which have surged in popularity partly due to social media and celebrity culture, despite limited regulation and oversight of the clinics administering them.