Detection, identification and quantification by 1H NMR of adulterants in 150 herbal dietary supplements marketed for improving sexual performance

- NMR analysis of one hundred and fifty 100% natural dietary supplements enhancing sexual performance.
- 61% were adulterated with PDE-5 inhibitors, 5.5% with other drugs.
- Up to four PDE-5 inhibitors were detected in the same formulation.
- Manufacturers change the chemical composition of formulations over time.
- Poor manufacturing practices were revealed in several cases.