Editing Dextrorphan (section)

==Environmental presence==
In 2021, dextrorphan was identified in >75% of sludge samples taken from 12 [[wastewater treatment]] plants in [[California]]. The same study associated dextrorphan with [[estrogenic]] activity by using [[predictive modelling]], before observing it in [[in vitro]].<ref name=Black2021>{{cite journal | vauthors = Black GP, He G, Denison MS, Young TM | title = Using Estrogenic Activity and Nontargeted Chemical Analysis to Identify Contaminants in Sewage Sludge | journal = Environmental Science & Technology | volume = 55 | issue = 10 | pages = 6729–6739 | date = May 2021 | pmid = 33909413 | pmc = 8378343 | doi = 10.1021/acs.est.0c07846 | bibcode = 2021EnST...55.6729B }}</ref>

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