Likelihood of supplements producing false positive on a employment drug test
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By John2004 - 7/9/2011 12:46:37 PM
Hi everyone,

I may be switching jobs soon and this may require  pre-employment & post employment drug testing. 

I do not use any illegal drugs. However, I am concerned that supplements could cause a false positive. I remember reading that vitamin B2 could cause a false positive for THC. Is there any problem with 1000 mcg of B12 per day ? Can I at least keep taking my fish oil and basic multi-vitamin ? 

I have listed the supplements I am currently taking below. Hopefully I can keep taking everything except the b-complex but still keep taking the 1000 mcg of B12. 

It's a shame I would need to stop taking supplements to avoid the issue since you need them most during stressful times.  How long before a test should I stop using the supplements ? I have never had to take a drug test before, do you generally get the opportunity to advise them as to what you are taking beforehand ? Should I request a specific type of test that has fewer false positives ? What percentage of tests are false positives ?

I hate to have to worry about this, a person should be able to take the supplements they want when they want.   

I would appreciate any feedback, advice, or suggestions.



My current daily regimen:

Basic Multi-Vitamin - Ingredients listed at this link  just click "show image" 

2000 IU of vitamin D

250 MG of magnesium oxide

4800 MG of Fish oil giving me 1200 MG of  omega-3  (720 MG EPA & 480 MG DHA)

For stress & energy I recently started taking a B-complex containing... 

50 MG each of B-1, B-2, Niacin, B-6, B-12, Biotin, Pantothenic acid, Choline bitartate, inositol, and PABA. The complex also has 400 mcg of folic acid.  In addition to that I have been taking an additional 1000 mcg of vitamin B12. I also drink brown and/or green tea. 
By Tom. - 7/11/2011 7:03:50 PM

I wouldn't worry so much about it if I were you. The stress alone isn't worth it.  Its obvious you're concerned so rather than trying to figure out how to keep taking them just stop taking them until your test is over. 
By John2004 - 7/13/2011 6:48:47 PM
Hi Tom,

I guess I will get a little notice before the test unless they hire you and call you in the next day for the test ? As long as I get a little notice I could stop taking everything for a few days prior to the test.

Another problem is random testing after employment. I understand why they want to test, but it bothers me that someone like myself who does not use illegal drugs has to worry about their supplement use causing a false positive. Given the diverse range of ingredients and the dosages used in Life Extension Mix, I thought perhaps someone here had some experience with this issue. 

I guess all I can do is try to tell them what I am taking beforehand, and hope for the best.  Hopefully, once I am hired & work there for awhile they will realize that testing me is a waste of time and money and test someone else. 

Fish oil and Vitamin D seem to help me quite a bit with stress in general. I would think I could at least take those, otherwise, eating fish and going into the sun would cause false positives. Having to not take something that helps me with stress, in a stressful time, seems ridiculous to me (which causes more stress) Smile

Hopefully there will be no problems.


By Ross7755 - 7/14/2011 3:10:37 AM
I take everything you do and more. I didn't stop any of my supplements when I had a
drug test for my job and I had no problems.  I haven't heard of supplements causing
false positives before, I know that there are some over-the-counter medications that
can, but I am unaware of any nutritional supplements that cause false positives.
By ccf344 - 7/29/2011 9:47:39 PM
I am a union pipefitter and every time I get dispatched to a new job, sometimes several times a year, I have to take a drug test. I take a wide selection of vitamins/supplements and I never had any problems with false positives. I sometimes work outages at the two nuclear power plants here in California and it seems that the opinion of the personel responsible for the fit for duty program at both plants is that vitamins and supplements don't cause false positives. Hope this helps. Al
By DDye - 7/31/2011 9:58:45 AM
Welcome to the Forums, Al, and thank you for your reply.

D Dye
Forums Moderator