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How Long Does Marijuana Stay in Your Hair Follicles?

How long is the hair follicle drug test detection time? This one question might be spiraling in your head if you need to undergo a follicle test. This might not be true for those who don’t indulge in the occasional pleasure of weed. But then again, finding people who didn’t give in to the allure of marijuana is a hard job. In 2023, almost half of U.S. adults have used marijuana at least once. This industry is growing faster than the states are legalizing cannabis. Employers still conduct drug tests, so a popular question arises – how long does THC stay in your hair? Well, we have an answer for you.

Passing a hair drug test is very tough all the more reason why a surging number of employers prefer it over other drug tests. It can identify the existence of drug residues for about 90 days. On top of that hair drug tests presumably have a close to perfect accuracy score. If you have weed traces in your hair – it will detect them. So, using a top-notch detox shampoo like Old Style Aloe Toxin Rid is a must.

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Kinds Of Drug Tests

A confirmatory test is a common thing for urine or saliva drug tests when someone tests positive for drugs. They do it to strike out the chances of mistakes. But hair drug tests don’t need a second test. Thus, federal government departments and many corporate organizations like to perform follicles tests before recruiting.

A urine drug test has some drawbacks, and one of them is detection window. THC doesn’t stay in urine for months. This is why nowadays employers prefer to use follicles tests. So, if you have a pre-or post-employment drug test it is more likely they would ask for a hair drug test.

It might be hard to beat a hair drug test but it is not impossible. You would find many detox products in the market that can help you pass the test. Some even claim to work in just 24 hours. In this article, we are going to help you understand what a hair drug test is, and how you can pass it along with the do’s and don’ts.

So, What is This Hair Drug Test?

As the name suggests hair sample is used in hair drug tests. It has the longest drug detection window of 90 days. If someone smoked pot and took a follicle test within 90 days he or she is going to test positive. The same goes for other types of drugs. That’s the answer for the question, how long does THC stay in your hair.

How Does Hair Drug Test Work?

When you use drugs, the drug metabolites get mixed in your bloodstream. From there it reaches every cell of your body. The drug residues go up to your hair follicles too via the blood vessel. That’s why when they test the hair sample of a drug user it detects the existence of drugs.
For the test, the lab assistant or a doctor would cut 1.5 inches of hair from the roots. But don’t be alarmed since they wouldn’t take only a small amount. They might collect the sample from multiple places on your scalp so it is not noticeable. Afterward, they would send the sample for analysis. Within a few days, you would have your test results. And without Old Style Aloe Toxin Rid , there’s a big chance that they will be positive.

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  • Is the main part Of The Jerry G Method!
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Zydot Ultra Clean Shampoo

  • Shampoo and Conditioner. Internal Hair Purifying Treatment that removes medications, chemical buildup and other impurities from within the hair shaft.
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How Long Does Marijuana Stay in Your Hair Follicles?

As mentioned, like any other drug marijuana stays in your hair follicles for 90 days. The drug detection window for follicle tests depends on the amount of time that usually takes hair to grow past the scalp. Another important fact here is the part from where the sample would be taken.

Reliable sources report that new hair starts to grow within 5 to 10 days. Also, each month our hair grows about .5 inches. And the lab testers need 1.5 inches of the hair sample from the roots to run a follicle test. So, if you do the calculation, it is easy to understand that you would need 90 days for complete detoxification. So, if you are a weed user and take a hair drug test before that you would test positive for marijuana.

What Can Be Detected in A Hair Drug Test?

Well, now you know, how long does THC stay in your hair. But what to do with this scary fact? Don’t worry, we have a solution for you!

It is possible to look for a particular type of drug through hair drug tests. But mostly your employer would like to know your drug history. For that, the testing laboratory would run tests to detect the traces of several substances. And these substances are:

  1. Marijuana
  2. Phencyclidine
  3. Cocaine
  4. Opiates
  5. Amphetamines

Can hair drug tests give false results?

A hair drug test is a great way to determine whether an individual is a frequent user of unauthorized substances. The test that’s conducted can show three results, i.e.,


A positive result means that the lab found drugs in a person’s system. Such samples are usually sent for further testing to determine and evaluate the conclusion.


Negative results mean the laboratory could not find any drug metabolites in the sample. After a proper evaluation, the results are then shared with the individuals.


Hair samples have the risk of getting contaminated or damaged. In this case, the laboratory is unable to perform a proper test. Additionally, the test is deemed inconclusive if anything goes wrong at the lab or the test doesn’t show satisfactory results. Therefore, one might send in another sample for a retest.

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  • Is the main part Of The Macujo Method!
  • Is the main part Of The Jerry G Method!
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Zydot Ultra Clean Shampoo

  • Shampoo and Conditioner. Internal Hair Purifying Treatment that removes medications, chemical buildup and other impurities from within the hair shaft.
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Factors for a false drug test result

It’s imperative to note that a hair drug test can provide possible results within three months of taking the sample. However, if the period has passed, the test and results can get influenced due to the environment and not be accurate.

In short, yes, a hair drug test can give a false result. So, what factors affect the reliability of the test? Here are a few reasons why:

Artificial hair dye

If a person dyes or bleaches their hair regularly, the hair drug test may show wrong results on the hair sample. Bleach is a powerful chemical that can remove traces of drugs from the hair. Additionally, it may cause certain drugs to be absorbed by the hair, showing wrong results.

Hair type and color

Melanin gives the hair its color. The more this compound is present in a person, the darker their hair is. According to studies, drug metabolites attach more to melanin, so a person with darker hair may show higher traces of the drug as compared to a light-headed individual.

Hair growth

The hair typically grows half an inch every month, but this is an average number, and different people can show varying results. So if an individual’s hair doesn’t show as much or grows farther than average, it can impact the test results.

Area of the sample

Lastly, the area of the head from where the sample is collected can also influence the result. The testing guidelines suggest that the model is collected from either the crown or the nape of the head. But if the hair is collected from any other area, this can influence the result by up to 20%

Conclusively, there are many reasons why a hair test can give a false result. Many factors are controllable, but others are purely natural, so having an accurate test result depends on the situation and other factors

What factors affect the time weed stays in your system?

THC or Tetrahydrocannabinol is an active compound found in weed. This compound is the amplest and primary substance present in cannabis. It is responsible for giving cannabis users the ‘high’ that the drug provides. So, the time weed stays in a person’s body depends on many things, the main factor being THC.

Here’s a list of reasons that can affect the time duration of weed in a human body.


The top factor is the quantity of weed. If you use it a little, it can easily and readily be excreted out of the body. On the other hand, overdosing and inhaling a lot of weed can make it difficult for the body to process the drug.


People either consume this drug as a stress reliever after long intervals of time or smoke weed all day, every day. So, the usage will naturally affect how long does thc stay in the system. An occasional puff will not take long to leave the body, but if you load a high quantity of cannabis regularly, it may take much longer to leave the system altogether.

Presence of THC

The amount of THC varies according to weed types and quantity. So, if the THC levels are low, it will be easier for your body to expel the drug and vice versa.

So, how long does THC stay in the system?

THC can stay in the hair for up to 90 days. Regarding the urine test, THC can be detectable for a month. In your saliva, the compound will exist for 24 hours, and in the blood, it’ll be present for almost 12 hours.

Method of ingestion

Did you know that how a person ingests weed can affect the time it stays in the body? Yes, that’s true. If you are an avid weed inhaler, the THC compound will reach the bloodstream and organs much quicker than if you infected it orally.

Gender and age

This factor will also significantly affect the weed survival time. With age, the body’s processes also slow down, and it might get more challenging for the system to expel the drug efficiently.

Metabolism rate

Every individual’s metabolic rate is variable depending on their lifestyle and health. Therefore, it will also impact how long weed stays in a person’s body.

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  • Is the main part Of The Macujo Method!
  • Is the main part Of The Jerry G Method!
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Zydot Ultra Clean Shampoo

  • Shampoo and Conditioner. Internal Hair Purifying Treatment that removes medications, chemical buildup and other impurities from within the hair shaft.
See Deal →

How much marijuana do you have to take to fail a drug test?

Again, the level of marijuana in the body significantly depends on the amount of THC in it. Therefore, the test results will vary for each individual based on how much you use the drug.

According to a study published in Forensic sci int., The detectable levels of cannabinoids in the hair range from 3.4 to > 100 pg THC/mg and 0.10 to 7.3 pg THCCOOH/mg hair. If you smoke 1 to 5 marijuana cigarettes on average, you might fail the test depending on usage and quantity.

On the other hand, if you take a urine drug test, the results will return positive if you have more than 50 nanograms per milliliter of THC in the sample. So if you’re not a frequent marijuana user, but the test comes back positive, it means the amount of THC in the drug is high.

How Can You Beat a Hair Follicle Drug Test?

You can use a few methods to clean your system from THC in record time before undergoing the follicle tests. One of those is hair follicle drug testing shampoo. Now there is a ton of detox shampoos available but don’t get overwhelmed with them. You have to choose the best one to pass. To narrow down your search check out the following brands for better results.

Old Style Aloe Toxin Rid Shampoo

Old Style Aloe Toxin Rid Shampoo is a very popular choice among cannabis users. It removes the traces of drug residues in a minimum time. Moreover, Toxin Rid has other products to help you cheat a urine drug test and saliva drug test. It might be a bit costly compared to similar detox shampoos. But the price tag should be a problem when your job is at stake.

People ask how long does weed stay in your system? And till this point, you know the answer. You have to stop using weed for 90 days to cleanse your system naturally. With Old Style Aloe Toxin Rid Shampoo, you can get the same results in just 24 hours.

Those who use marijuana occasionally can pass the drug test in 1 day. But heavy users should use the shampoo for 3 to 10 days. It can take more time depending on the type of weed user you are.


  • Very popular among marijuana users and have great reviews
  • The formula used in making this detox shampoo is very effective in removing impurities, and drug metabolites from the follicles.
  • Old Style Aloe Toxin Rid Shampoo is good for all kinds of weed users
  • It gets rid of toxins and drug residues without doing any damage to your scalp or your hair.


  • Some say the product isn’t that much available
  • It is expensive as the price can go up to $300 in some of the outlets.

High-Voltage Detox Shampoo

If you are looking for a shampoo that can detox your hair, comes cheap, and doesn’t compromise its effectiveness you should choose High-Voltage Detox Shampoo. It isn’t as popular as Toxin Rid or Zydot Ultra Clean, but still it provides great results. With each day, High-Voltage detox shampoo is getting more and more popular in the cannabis community because it costs only $35.


  • The formula of High-Voltage Detox shampoo has gone through a lot of tests to see if it really works in purging out traces of substances and it really does.
  • It helps to wash out THC from the follicles softly
  • The detox shampoo doesn’t damage your hair or irritate the skin of your scalp
  • The price is also reasonable unlike Toxin Rid

Zydot Ultra Clean

If I have to rank based on effectiveness and popularity Zydot Ultra Clean would rank second on the list. Some even claim that the detox shampoo is as effective as Toxin Rid. Zydot Ultra Clean doesn’t come very cheap but the price is lower than Toxin Rid.

The best part of this detox shampoo is the additional things you get with it. You get a conditioner and a purifying treatment along with it. After applying the shampoo to your hair and rinsing it you have to use the purifying treatment. It helps to penetrate the inner layer of your follicles and remove the drug residues. It also helps to clean your scalp nicely.

The conditioner is to mask the effect of using the detox shampoo. Detox shampoos hurt your hair health. It can make them dry and rough. The conditioner minimaxes the damage and makes your hair look soft, healthy, and shiny. It takes more time than Toxin Rid in removing the toxins. But if you use it as a part of a detoxification method it can boost the effectiveness leading to testing negative on the drug test.


  • It is a popular choice
  • Costs lesser than Toxin rid
  • Very effective in removing THC
  • Scientifically tested to find out the potency of the formula.
  • It works even better if paired with the Macujo detox method.


  • People with long and thick locks would probably need to buy more than one package of detox shampoo since the content doesn’t weigh much.
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Aloe Toxin Rid Shampoo + Zydot Ultra Clean

  • Is the main part Of The Macujo Method!
  • Is the main part Of The Jerry G Method!
See Deal →
Zydot Banner

Zydot Ultra Clean Shampoo

  • Shampoo and Conditioner. Internal Hair Purifying Treatment that removes medications, chemical buildup and other impurities from within the hair shaft.
See Deal →

Home Remedy for Detoxification

Some people prefer to use natural methods to detox the body. While this might be a safe solution but it takes a lot of time. These home remedies only work if you stop taking drugs while you are on the detox program. To pass the follicle test you must refrain from using drugs for 3 months. So, make sure you are patient enough to wait a long period before you can use weed.

If you still want to know how to pass a drug test then do the following. Remember these remedies might take some time to work. So, if you do have time before you are scheduled to take the test then use the described methods. Otherwise, we recommend you use detox shampoos to pass a follicles drug test.

The Macujo Method – Still The Best

This is one of the most effective home remedies which is widely used by cannabis users. With some basic ingredients, you can detoxify the hair follicles. It has many steps to follow but the result is worth the hassle.

For the Macujo method you would need the following:

  • Warm water
  • Old Style Aloe Toxin Rid Shampoo
  • Zydot Ultra Clean
  • Goggles
  • Vinegar
  • Shower caps
  • Disposable gloves
  • Clean and Clear
  • Liquid Tide detergent
  • Detox shampoo

Macujo Method Steps

The process of using the method is described below. Follow them without missing any steps and your hair would be free of drug metabolites.

  1. Stop using weed to mark the start of your detoxification day. The Macujo method would do no good if you don’t stop marijuana consumption.
  2. Now massage some vinegar nicely on your scalp. After that use Clean and Clear and use it on your hair. You have to do this without washing the vinegar. Put on a shower cap when you are done applying clean and clear. You have to keep it like that for 30 minutes.
  3. After 30 minutes wash your hair. You have to rinse your hair two times after applying any type of detox shampoo. For that, we would suggest you use Old Style Aloe Toxin Rid Shampoo. When you have washed your hair, you need to again wash it after using tide liquid.
  4. In the last step, you have to use Zydot Ultra Clean Shampoo and wash your hair clean. You have to remember which step is when otherwise the result won’t be that effective. Repeat the whole process three times before taking the drug test. You must repeat the process on your test day too.

Which Employers Use Hair Drug Tests?

Major companies prefer hair drug tests over other types of tests. It is common for trucking companies but other industries also use hair drug tests. I am listing some of them below:

  • Food industries
  • Oil and gas
  • Gaming industry
  • Financial industries
  • Auto manufacturing

The Do’s and Don’ts of Hair Follicle Drug Test


  • Stop smoking weed
  • Do regular exercise
  • Eat foods that help to boost the body?s detoxifying process
  • Drink a lot of liquid


  • Shaving your hair doesn’t help since lab testers would take a sample from elsewhere
  • Bleaching your hair doesn’t mask the existence of drug residues so even after bleaching you would still test positive.
  • Dying is as useless as bleaching because it cannot hide the traces of drug residues

Do you need treatment for marijuana addiction?

Marijuana has many stress and anxiety-relieving benefits, but at the end of the day, it’s still a drug. If you believe you are addicted to smoking or ingesting marijuana, it’ll be wise to seek treatment. Otherwise, it can end up harming your health and daily life.

The frequency and duration of the treatment greatly depend on the level of addiction. If you’re a new user but wish to leave the drug, you can do that at home with the support of family and friends. But, drug abuse and addiction cases need to be taken care of by proper professionals and require medical assistance.

There are many rehabilitation centers for hard-core addicts to bring them back to the real world. So, whether you need treatment or counseling for your addiction depends on the observation and advice of your physician.

The initial period will be the hardest, no matter how to deal with the addiction. Marijuana, like any drug, develops dependency in the human body. Therefore, withdrawal symptoms can be challenging and complex. But, as time passes, breaking the addiction slowly becomes easier.

The Bottom Line

So. now you know how long does marijuana stay in your hair follicles. The most common term is 90 days, and this is really a huge term. And one more bad fact – ordinary detox solutions like drinks or pills don’t work here.

For any marijuana user, the news of drug testing is nothing less than a nightmare. To make things worse, your employer sometimes can ask for a hair drug test which is hard to cheat. As a quick rescue, you can buy a detox shampoo to get rid of the traces of drugs. We have shared our pick of the detox shampoo – the best is Old Style Aloe Toxin Rid, when used with Zydot Ultra Clean. This solution has a proven track record and is really effective.