How Long Does THC Stay in Your Hair
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So, are you here because you just want to know how long does thc stay in your system or you have a drug test tomorrow? Well, I sure hope it ain’t the latter. Relax! It’s not that big of a deal.

Firstly, What is THC?

THC or tetrahydrocannabinol as it’s known in scientist circles is the psychoactive compound that is found in marijuana, weed or pot. It is the one responsible for the high you feel after smoking or consuming any 420 items.

So, How does the body process THC?

The THC is absorbed into the bloodstream through the lungs (if smoked or vaped) or the digestive system (if ingested). From there, it quickly travels to the brain and other organs, producing its characteristic effects. 

The liver then metabolizes THC into various compounds, including 11-hydroxy-THC and 11-nor-9-carboxy-THC (THC-COOH), which are then excreted from the body via urine and feces. 

While most of the THC is eliminated from the body within a few hours to a few days, metabolites like THC-COOH can linger much longer. Now those are the ones that rat you out in the drug test.

How long does THC stay in your system?

The duration of time THC stays in your system depends on various factors, including how many times a day you intake it, the dosage, your metabolism, as well as the sensitivity of the drug test. 

Here are the average detection times for THC and its metabolites in different bodily fluids:

Average Detection Times

  • Urine: THC and its metabolites can typically be detected in urine for up to 3 to 30 days after last use, depending on factors such as frequency of use and metabolism.
  • Blood: THC can be detected in blood for up to 1 to 7 days after last use, while its metabolites may be detectable for up to 25 days.
  • Saliva: THC can be detected in saliva for up to 1 to 3 days after last use.

Finally, let’s talk about the belle of the ball: 

How long does THC stay in your hair?

Unlike other bodily fluids, THC and its metabolites can be detected in hair for an extended period, sometimes months or even years after last use. When you consume any 420 items, the THC is absorbed into the bloodstream, and small amounts are deposited into the hair follicles through the bloodstream. 

As your hair grows, these compounds become trapped in the hair shaft, providing a timeline of drug use.

On average, THC and its metabolites can be detected in your hair for up to 90 days after last use. However, several factors can affect detection times, including:

  • Hair color and type: Darker hair retains THC and its metabolites more effectively than lighter hair.
  • Frequency of use: Regular cannabis users are more likely to have detectable levels of THC in their hair for a longer period.
  • Dosage: Higher doses of THC may result in higher concentrations in hair.
  • Hair length: The longer the hair, the longer the detection window.

Legal implications of THC detection in hair

While drug tests for THC are common in many workplaces, the legal implications of THC detection in hair are still a matter of debate. Some argue that hair testing for THC is unfair, as it can detect cannabis use that occurred weeks or even months prior. Others argue that hair testing provides a more accurate and reliable method for detecting cannabis use, especially in safety-sensitive industries.

Myths about THC in hair

There are many myths and misconceptions surrounding THC detection in hair. One common myth is that shaving your head or using certain hair products can help you pass a hair drug test. However, these methods are not effective, as THC and its metabolites are deposited into the hair follicle, not just the hair itself. 

Additionally, while THC can be detected in hair for up to 90 days, most standard drug tests only look for recent drug use, typically within the last 30 to 90 days.

How to get THC out of your system

If you’re about to face a drug test and are concerned about THC detection, there are several strategies you can try to help speed up the elimination of THC from your body:

  • Hydration: Drinking plenty of water can help flush THC and its metabolites out of your system more quickly. However, be careful not to over hydrate, as this can be dangerous.
  • Exercise: Engaging in regular exercise can help speed up your metabolism, which may help your body eliminate THC more quickly.
  • Healthy Diet: Eating a balanced diet rich in fruits, vegetables, and fiber can help support your body’s natural detoxification process.
  • Sauna or steam room: Sweating can help eliminate toxins from your body, including THC metabolites. Spending time in a sauna or steam room may help speed up the detoxification process.
  • Abstaining from cannabis: The most effective way to ensure THC is out of your system is to abstain from cannabis use altogether. While THC can linger in your system for weeks or even months, it will eventually be eliminated if you stop using cannabis.


THC and its metabolites can be detected in hair for an extended period, making it one of the most reliable methods for detecting cannabis use. While there are ways to speed up the elimination of THC from your body, the best way to ensure a negative drug test result is to abstain from cannabis use altogether. If you have concerns about THC detection, consult with a healthcare professional for personalized advice and support.

Brain Behind The Words

Kabir Dutt


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