Cannabis distillate potency: short answer
Distillate potency is the concentration of THC in a refined cannabis oil. Most distillate products test between 80% and 95% THC by weight. A 1-gram cartridge labeled 90% THC contains about 900 mg of THC. Potency is measured by high-performance liquid chromatography (HPLC) in a licensed lab. Labels show total THC, which combines THC and THCA after decarboxylation. Potency does not measure taste, terpenes, or effects.
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How labs measure distillate potency
Labs dissolve a distillate sample in solvent. HPLC separates cannabinoids. A detector measures THC and THCA. The lab calculates total THC: total THC = THC + (THCA × 0.877). That 0.877 factor accounts for the lost carbon dioxide when THCA converts to THC. Results go on a certificate of analysis (COA). State rules set acceptable variance. Colorado allows a 10% variance for THC potency on labels. Some states allow 15% or more.
Why distillate potency varies
- Starting material: trim, flower, or whole plant changes cannabinoid profile.
- Extraction method: CO2, ethanol, or hydrocarbon yields different crude oil.
- Distillation passes: each pass removes more terpenes and other cannabinoids. More passes can raise THC percentage.
- Batch size: large batches mix more material, which can smooth potency.
- Lab error: sampling and testing methods vary by lab.
Potency does not equal quality
A 95% THC distillate lacks terpenes and minor cannabinoids like CBD, CBG, and CBN. Those compounds may change the experience. High potency also raises tolerance. A 2021 CDC report notes that high-THC products link to higher risk of cannabis use disorder and anxiety. Start with a low dose. For inhaled distillate, 1 to 2 mg of THC is a common starting point. Wait 10 to 15 minutes before redosing.
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How to read a distillate label
- Find total THC. This is the number that matters for dose.
- Check the COA. Look for the lab name, batch number, and test date.
- Compare THC percentage to product weight. 0.5 g at 85% THC = 425 mg THC.
- Note terpene content. Distillate often has added terpenes. That is not part of potency.
- Check for pesticides, solvents, and heavy metals on the COA.
State rules on distillate potency
Legal states cap THC per package. Colorado limits recreational concentrate to 8 grams per transaction. Washington limits 7 grams. Some states cap THC per serving in edibles at 10 mg. Distillate for inhalation often has no per-serving cap. Check your state's rules. Potency labels must match lab results within a set margin. If a label claims 90% THC, the lab result should be between 81% and 99% in Colorado.
Bottom line
Distillate potency is a number: total THC by weight. It tells you how much THC is in the product. It does not tell you how the product will feel. Use the COA, start low, and track your dose.