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Writer & Editor

Chase

Chase is the writer and editor of TestSubstances. He built the site's testing guides and product reviews, tests reagent kits and fentanyl strips as part of the review process, and focuses on practical, non-judgmental harm reduction information.

Drug Checking

Hands-on reagent testing and fentanyl strip evaluation behind the product reviews.

Editorial

Writes and edits the buying guides and the harm reduction library.

Methodology

Grounded in published harm reduction research and lab protocols.

Want to contribute? We're always looking for harm reduction writers, researchers, and people with lived experience — see our pitch guidelines. Curious how the kits on this site get tested? Read our how we test methodology.

The Harm Reduction Letter

New testing guides, supply alerts, and one honest product pick per week. No spam, no sharing your address.

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Supporting global harm reduction efforts since 2020. We curate, evaluate, and provide analytical tools for testing kits to verify substance integrity and protect communities.

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CRITICAL HEALTH & SAFETY NOTICE: Testsubstances.com harm reduction test kits are strictly qualitative screening reagents intended solely for analytical identification. Reagent tests do not guarantee absolute purity, and cannot screen for all potential active cutting agents, lethal impurities, or adulterants. No substance consumption is ever 100% safe. Always practice extreme caution and consult qualified medical professionals.

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