Niacin Flush Detox Method

Niacin Flush Detox

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With drug testing beginning to rise in popularity as a workplace standard, people are starting to look for more and more efficient ways to quickly cleanse their bodies of substances that could make them test positive. Taking niacin has long been a known detox method, but its effectiveness has always been a topic of debate.

Table of Contents

What Niacin Is

Niacin, otherwise known as Vitamin B3 is compound naturally found in a human body that serves the purpose of metabolizing carbohydrates. When it comes to niacin for drug testing, it is usually talked about niacin pills that can be bought in pretty much any pharmacy.
Niacin pills are usually used as a dietary supplement for people who are suffering from high cholesterol levels or low niacin levels, but it is also often used to increase the health of skin, hair and eyes. A niacin pill has around 500mg of niacin in it and the recommended daily dose is up to 2000mg, to prevent the occurrence of negative side effects.

Negative Side Effects of Niacin Pills

  • Skin flushing
  • Burning sensation
  • Swelling
  • Reddening of skin
  • Skin lesions or hives
  • Diarrhea
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Niacin Flush

Niacin flush is a method that has been argued to allow a person to successfully clear out traces of metabolites from their body in a shorter amount of time than usual. This is done by increasing the rate at which body breaks down fats, which is where metabolites usually tend to deposit, which in turn allows the person to pass the drug test even though just a short period of time has passed since their last drug use.

The problem with this method is that niacin pills have varying levels of effectiveness from person to person, depending on their height and weight, as well as their metabolism rate. People with higher than average body fat content have reported this method to fail more often than people with lower body fat content.

Another thing to note about this method is that it is not a miracle solution like some people claim and that it has to be done over a period of time, preferably 2 – 5 days for maximum efficiency. This is due to the fact that niacin is very hard on one’s liver and taking large amounts of it (more than 500mg) at once poses a serious health risk.

On the other hand, if the person using this method properly spaces out their dosage (500mg or one pill every 6 hours for 3 or more days) and hydrates plentifully, they pass the drug test in 80% of the reports.

Addiction Resource team does not encourage to use any of the methods for speeding drug cleaning, especially if it is performed for faking or cheating drug screening results.

If Taking Niacin Pills

  • Always space them out at least 5 hours to prevent overdosing.
  • Drink a lot of water, preferably two full glasses with every pill. Also drink as much water, fruit juice, sports drinks or caffeinated drinks during the day, but be careful not to overhydrate oneself.
  • Abstain from drugs and alcohol, to prevent negating the effect of niacin pills.
  • Eat light meals and stay away from fatty foods.

Does Niacin Flush Work?

Despite the fact that many people claim that this method does not work, it usually stems from the fact that the amount of time that the pills were taken for was not sufficient. Taking a large dose of niacin pills in a short period of time, just before a drug test, often cause serious health problems then help pass said test. Only by giving it time will this method have the expected effect without the negative consequences.

View Sources
  1. Jacobson T. A. A “Hot” Topic in Dyslipidemia Management—“How to Beat a Flush”: Optimizing Niacin Tolerability to Promote Long-term Treatment Adherence and Coronary Disease Prevention. Mayo Clinic Proceedings. 2010; 85(4): 365–379. doi:10.4065/mcp.2009.0535.
  2. Kamanna V. S., Ganji S. H., Kashyap M. L. The mechanism and mitigation of niacin-induced flushing. International Journal of Clinical Practice. 2009; 63(9): 1369–1377. doi:10.1111/j.1742-1241.2009.02099.x.


Leave a comment

  • Jace B
    It works ! I’m about 5’10 & 150lbs . I had to take a drug test and I forgot so when the day came I took three niacin pills , and it worked. However ideally I would have taken two pills for five days up until the day I had to test . However I forgot that’s why I took three.
    • Caleb Larson
      I’m looking at your post man we’re the same height an weight an you only took 3 on the day of the test how long before the test did you take them
      • Curious
        Yeah I would like to know as well, I’ve been taking niacin, pure cranberry juice, and water for 4 days now, I’ve smoked my whole life basically and am worried about my test Wednesday, tmrrw is my last full day I’ve been taking about 3k mg daily for 4 days and have some to take tmrrw and 2 before my urinalysis.
        • Meme
          Did it work?
  • Renee S.
    So I have to pass a drug test Friday, mind you I haven’t smoked in 75 days. I’m 5’6 and 280 pounds. I took one pill and didn’t like the way it made me feel. I think I’ll continue to not indulge and hope for the best.
    • Casreal
      If you haven’t smoked in 75 days there shouldn’t be anything in your system anyways.
      • Cherylynne
  • Debra D Downey
    I have a drug test on wed I have been taking the. Nican since Friday 1 time a day what do I have to do next plz some tell me
    • Triston Bowie
      Drink water lots of water
      • April
        I have to take a drug test in less than 24 hours but I’m not a heavy smoker and the last time I smoked was 4 days ago. Will the niacin flush work?
        • Bridgette
          Did it work?
      • Tae
        I have to take a drug test next Friday how offen do I have to take the pill and how long do it take to clear your system form weed
  • Gail
    I read an article just before this one that said if a person is to take slow release niacin or to spread the niacin out that that could cause liver damage and that it is better to take them all together at the same time. I find this bit disconcerting and confusing. Sincerely, Gail
    • Paul. Foster
      In highschool I passed 100 percent of my tests. I don’t remember how many I took but it was all at once usually the day or two before the test. Thinking I took 5 Pills at once and had a gallon of water that I downed over the next couple hours.Mind you if you do this please make sure the niacin doesn’t interact with any prescription medications you’re taking. Your face will get super red and is a little painful. Your whole body will feel and look flushed and itch badly for a couple hours.We did this in highschool and I was young and in shape so I guess it depends on a lot of factors. Maybe start off with double what the bottle says and up it from there. Takes about an hour to kick in so be safe if you don’t feel anything. Use at your own risk!
      • elliott
        Exact same to the T
  • Ray
    I only took one niacin pill Sunday and I passed my drug test Monday all I did was drink a gallon and a half of water.
    • Asking ForaFriend
      But were you a heavy “drug” user before the test?
    • Corrie
      For what kind of drug and what kind of test
  • Dexter
    Does niacin flush out from everywhere like hair follicles too.
    • A
      Hair is dead skin cells, so whatever is in them stays in them.
  • Nikki
    Im over 300 pounds if I take niacin right now will it work for a test tomorrow I’ve already been drinking water and about to drink cranberry juice will it work
    • Curious
      Did it work?
  • Charles Mccloud
    I’m 350 will work for me if my test is tomorrow and I started at 4 o’clock this afternoon drinking plenty of water plus niacin
  • Dave
    I’m 6’1 135 w/ only 7% body fat I haven’t smoked in 4 days but only once or twice a day for about a week but it was a dab pen will I pass my test today
  • Theresa Pedraza
    Wondering if it worked if so how many pills did u take and how long did u take them before your test
    • Trasharria Mitchell
  • Mia
    If you used cocaine 72 hours before taking niacin what are my chances of passing a drug test in 24 hours?
    • Casreal
      Cocaine stays in your body 3 to 7 days after last use. If your a heavy user and have a high body mass index (overweight) you can expect for the drug to stay longer.
  • Marilyn
    I need to pass a nicotine cotinine smoking test before my insurance will approve my surgery for Nov. 12. They said I needed to be tobacco free for 30 days. I have fallen off the wagon a couple of times but I have GOT to pass this test NOW. Been drinking lots of water, eating oranges, pure cranberry juice and have not cheated again. Will the niacin help also? I have to clean my system as soon as possible! Any advice will be appreciated.
    • Brenda Escamilla
      I have the same question?? A nurse friend of a friend said she took Niacin as prescribed on bottle and it worked for continine / nicotine test. I have 4 days to get nicotine out of my system. But ive only smoked a couple through out the day. Did it work for you?
  • Ollie
    I’m going to quit drinking what’s good to help flush it out
  • Faith
    If I smoke the day before and then start taking the pills will it still flush it all out in like 3 days.
  • Kniheem
    Okay well I’m 5,4 and like 107 in weight and if I take two of them pills for three days will all the weed get out of my system or do I have to take them before the test?
  • Rizarrio
    I’ve passed many drug test using it. I need to know if the non flush works the same way?
  • Geoffrey Shadley
    I been taking it for like a week I have a test on the 6th will I have to keep taking them or will I be ok to pass it
  • Legend
    I have a drug test on Tuesday and I took one a 12 this afternoon and another one at 3 I already had 41/2 bottles of water do I take more I’m 6’2 and 186 pounds ???
  • Ajizzle
    I am 5’10” 165 lbs with a high metabolism and I won’t have to take my drug test for another three weeks but I have been taking 1 500mg pill of niacin a day for the past four days should I increase the dosage I’m taking to pass in three weeks
  • Tye Roberson
    Does niacin flush your system in one day?
  • Rete
    I have to take a drug test I got called in for at 10:30am Tommrow I took about 5 pills total so far do u think it would work ? What can I do to pass it ?
  • Mmitch
    This stuff is real!!! Just watch your dosage. Do not take more than 500mg on your first dosage. See how your body reacts first. Do not take quick release, you can overdose. You Will experience an uncomfortable heat, itching. Calm down, relax, it will be over in less than an hour. Do not take a shower or bath, in the first hour. You will feel like you are freezing and it just makes it worse. You can take up to 1000mg after your first initial dosage, giving your body time to get use to the Niacin. I had to take a test in 30 to 45 days. I smoked 2-3 blunts a day, for atleast 2 years. That is heavy usage!! Make sure you are drinking a gallon of water per day. I’m 150lbs, so it is recommended to take half of your weight, so that’s about 64 fluid oz’s anyway. Now the water is the real “magic”, It helps naturally clean your blood and system out. Niacin helps clean your blood faster. Exercise, helps get the process of eliminating the drug toxins, But, if your test is within 3-4 days Do Not Exercise, because it will still be bringing the drug toxins out to the surface!! You do not need to take Niacin more than 14 days. But, do continue flushing with water. Depending on your drug frequency, you can definitely pass a drug test within 30 days, if you were not a chronic user ad myself. Also, during this time, You must eat foods like, green veggies, No sugar, Fats, breads, keep your diet simple. This will help you eliminate and cleanse easier. It took me 40 days to see a light colored sign on my drug test. If you don’t consume a lot of weed. It can take less than a week to two weeks. God bless you !! Hope you pass BTW I’m now totally free from my desire to smoke anymore. 2 months this was imaginable. Im getting to old to be going through tjis crap. I feel free again. And, I accomplish much more now.
  • Lisa
    I smoke weed today sat I quiet for month than wed.thrus.fri.sum day being sat. But I’ve been using nianian everyday for 8 days n 2 day in plenty of water n apple cider vinegar so no smoke tommsun or Mon or Tues wed is the text do u think I’ll pass
    • Curious
      Did it work?
  • Rk
    Have take a drug test on Monday last use of benzos was yesterday not an every day user as well as did little bit of dope again not an everyday day user what’s my chances of passing
  • James Adam Sykes
    My name is Adam and i take xanexs often and im also taking suboxone. Im a Marine Corps Veteran and had to get out of the Marine Corps after doing 2 back to back deployments to Fallujah Iraq. I got out with an honorable discharge. Im 5ft10 my weight is 173. Do you think if i take niacin it will get the Xanax out of my system? I know when my piss test is I go every month but i have popped on 8 piss tests in 8 yrs. Please respond when you get a chance. Thanks
  • Danette Lutrick
    Can takeing niacin and drinking lots of water help me pass a drug screening for thc
  • BLAH
    Niacin definitely works. Ive been passing tests w it for 10 years now to get zs out of my system. I just stop taking them 3 days before the test n start taking niacin (flush-free “Spring Valley” 500mg caps i take). Ill take ATLEAST 2 (1,000mg) every hour for those 3 days before the test. Im prescribed subs n cpins which sometimes becomes a problem becuz it flushes those out too. Ive never failed a test this way. Im just reading comments here now cuz i fuked up n did coke 3 days prior this time. I never touch that shit no more but im a drummer n around it alot so yeah. My test results come back monday so i am praying to god it doesn’t show up. I basically took 30,000mg within 3 days. I didnt have any negative effects like pple r saying. Oh forgot, I am 135-140lbs.