Contamination and Adulteration in Psychoactive Products

Urgent first

If someone becomes very sleepy, stops breathing normally, has a seizure or cannot be woken after taking any unregulated product, call 911. For poisoning questions in the United States, call Poison Help at 1-800-222-1222. [1][2] See When to Seek Urgent Help.

The basic problem

Contamination means something unintended is in a product (for example a dangerous drug). Adulteration means something has been added, deliberately or not. Mislabeling means the label does not match the contents. Psychoactive products sold outside regulated medicine are not checked the way medicines are, so the label cannot be treated as proof. This page uses the evidence labels established (reported by an agency or in a published analysis) and insufficient evidence. It gives no advice on choosing or testing products.

Fentanyl and similar drugs

NIDA says illicitly made drugs may be contaminated with colorless, odorless fentanyl or other dangerous substances that can cause serious adverse events, including overdose and death. [3] For psychedelic and dissociative drugs specifically, NIDA says adulteration with fentanyl is possible, but more research is needed to understand to what extent this occurs. [3] Insufficient evidence exists in the sources we read to say how often it happens for any named substance.

NIDA also notes that some organizations use harm reduction practices aimed at possible adulteration, particularly for pills, powders or liquids. [3] We do not describe those methods here, and this site does not recommend any way of using unregulated products.

What laboratory analyses of mushroom-labeled products found

• Virginia gummies (2023). Investigators bought gummies sold as mushroom "nootropics" and found unlabeled psilocybin or psilocin in four of six bags tested, plus caffeine, ephedrine and mitragynine (kratom). [4] This was a small purchase sample with a qualitative method, so it shows that mislabeling can happen, not how often. [4]
• Nationwide 2024 outbreak. FDA tested samples of chocolate bars, cones and gummies from one recalled line and found psilocin, acetylpsilocin, a prescription drug (pregabalin) and kava-plant compounds, with different compounds in different flavors. [1] Six of 22 gummy samples tested negative for the listed compounds. [1]
• Interactions unknown. The FDA noted that there is less research on how such compounds interact when ingested together. [1]

Why a single test result is not a guarantee

Content can vary by batch and even by flavor within one line, and the FDA saw that variation. [1] Not every compound can be found by every method; in Virginia, three compounds listed on labels were absent from the laboratory's reference library, so their presence was undetermined. [4] CDC's authors say availability of products with unlabeled psychoactive substances is increasing. [5]

Drug checking

Drug-checking services exist in some places. Proper evidence not found in sources we could read this session on how well they work for psychedelics: NIDA's statement above was the only usable source, and the European monitoring agency's page could not be read. Check local public-health sources if the topic matters to you.

Quality in regulated medicine

For approved prescription medicines, composition is set out in the regulator-approved label (for example the esketamine label read for this library). [6] For ketamine and esketamine, see Ketamine and Esketamine (Spravato). For supplements in general, see Product Quality and Contamination.

Related reading

• Unverified Mushroom Gummies and Similar Products
• Combining Psychoactive Substances, Alcohol and Other Sedatives