How Long Is THC in Hair? Detection Window Explained
How Long Is THC Detectable in Hair?
If you're preparing for a drug test, you're likely asking: how long is THC in hair? Hair follicle drug tests can detect THC use for significantly longer than urine or saliva tests — up to 90 days after use.
Why Hair Tests Show THC for So Long
After THC is consumed, it's broken down into metabolites, which circulate in the bloodstream. These metabolites can be deposited into hair follicles and incorporated into the growing hair shaft. Standard hair follicle drug tests analyze about 1.5 inches of hair, representing roughly three months of growth and usage history.
Factors That Influence Detection Time
- Frequency of Use: Regular users may have more THC stored in their system and therefore in their hair.
- Hair Color and Type: Darker hair tends to retain more THC metabolites due to higher melanin content.
- Individual Metabolism: A person’s metabolism and health can affect how quickly THC is broken down and eliminated.
For a scientific overview of marijuana detection timelines, see American Addiction Centers’ guide.
Want to Support Your Detox Process?
While you can't instantly remove THC from your hair, you can support your body's natural detox pathways through diet, hydration, and lifestyle changes. Start by reviewing our THC cleanse guide for practical strategies.
This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider before beginning any detox plan.