The short answer
Your body does not push THC and CBD back out the way you took them in. Liver enzymes, mostly from the CYP2C and CYP3A families, break those molecules into new ones called metabolites, and metabolites are what show up in your blood, urine, saliva, and hair. For THC the two that matter most are 11-OH-THC, which is still psychoactive and in some ways stronger than THC itself, and THC-COOH, the inactive leftover that standard urine screens are built to find. CBD takes a similar route through 7-OH-CBD and 7-COOH-CBD. Because drug tests hunt for metabolites and not the parent compound, a positive result tells you someone consumed cannabis at some point. It does not tell you when, how much, or whether they felt anything at the moment of the test.
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THC metabolites: the two names worth knowing
11-OH-THC
This is the first stop in THC metabolism, and it is not a waste product. It binds to cannabinoid receptors and produces effects, sometimes more intensely than delta-9 THC. When you eat cannabis instead of smoking it, more THC survives the first pass through the liver, so edibles generate a bigger load of 11-OH-THC. That is part of why edible highs feel heavier, come on slowly, and last longer. Levels of 11-OH-THC in blood peak later with oral use, which makes timing a single blood draw tricky.
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THC-COOH
Also written as carboxy-THC, this is the end-stage metabolite. It has no intoxicating effect, but it is fat-soluble, so it parks in adipose tissue and trickles back into the bloodstream for a long time. Immunoassay urine screens were designed around THC-COOH because it hangs around far longer than THC itself. Confirmatory testing with GC-MS or LC-MS/MS targets the same molecule with far more precision and can quantify it against a creatinine ratio to catch diluted samples.
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Why frequency matters more than dose
A one-time user and a daily user can take the same puff and face wildly different detection windows. THC-COOH accumulates in fat with repeated exposure, so heavy long-term consumers can stay positive on a urine screen for weeks. Occasional users often clear in a few days. Body fat percentage, age, liver function, hydration, and exercise habits all nudge that timeline, though none of them override it. I tend to think of it as a reservoir: the more times you fill it, the longer it takes to drain.
CBD metabolites
CBD follows its own path. 7-OH-CBD is the active intermediate, and 7-COOH-CBD is the long-lived one that researchers keep finding in urine long after the parent compound is gone. 7-COOH-CBD has a notably long half-life, which is why some CBD studies use it as a marker of recent intake days later. If you use full-spectrum products, remember there may be small amounts of THC present too, and those can contribute to a THC-COOH positive even when you never smoked flower.
What a positive result actually says
Urine, blood, and saliva answer different questions. Urine detects past exposure over a wide window. Blood reflects very recent use but correlates poorly with impairment. Saliva sits closer to recent use than urine but still cannot tell you how someone feels or whether they can drive safely. No metabolite level maps cleanly onto intoxication, which is why toxicologists and public health agencies keep repeating that detection and impairment are not the same thing.
Things people try, and what holds up
- Water loading: it dilutes urine, but labs measure creatinine and specific gravity, and a dilute sample usually gets flagged or rejected.
- Detox drinks and supplements: no product has solid evidence of clearing THC-COOH from fat stores faster. Most pass a test by dilution, not elimination.
- Exercise: burning fat can release stored metabolites temporarily, which is why some people test dirtier right after a hard workout week.
- Time: the only reliable variable. Clearance depends on your own metabolism and history of use.
The takeaway
Metabolites are the fingerprint cannabis leaves in your body, not a stopwatch. If you are shopping at a dispensary and care about what a future test might show, the useful questions are how often you use, how you consume it, and how much THC is riding along in that CBD tincture.