When we need to pass a urine drug test, we prefer to use the substitution method over cleansing products to ensure a reliably clean result. Unlike cleansing drinks or detox programs, a synthetic urine kit replaces your own urine sample with a quantity of clean urine. Since this method removes the risk of an incomplete cleanse, there are a lot of benefits to it. However, it may not be entirely foolproof—using subpar synthetic urine can produce a bad result.

So, how do you determine which substitution products are reliable and which aren’t? Here, we’ll compare a few of the most widely available synthetic urine kits, Monkey Whizz and U Pass 8.4 Synthetic Urine Kit, against the powdered urine kit from TestClear. There are many similarities between these three products, but, as we’ll demonstrate, not all substitution products are created equal.

Key Takeaways

  • The drug testing world is ever-evolving and a kit that worked two weeks ago may not work tomorrow
  • Not all cleansing or substitute products are created equal, nor do they all work the same  
  • Be sure to look up the ingredients of your cleansing or substitute kit; some may cause you to fail or even create false positives


TestClear vs. Monkey Whizz

What’s the difference?

Monkey Whizz is a product that many people have heard of but isn’t as widely used as other substitution products. This may partly have to do with the fact that Monkey Whizz is often marketed as a fetish product rather than a drug test substitution product, which may confuse some consumers. That said, we think it’s worth noting because, while the synthetic urine included in the Monkey Whizz kit is formulated to look and smell like the real thing, it may be missing some of the crucial ingredients necessary to hold up to the scrutiny of more advanced drug testing.

One of the perks of Monkey Whizz is that, in addition to their regular synthetic urine kits, they also have kits targeted at helping people pass supervised drug tests. These kits include things like fake penises and bags that are strapped to the body to dispense the urine through tubes, making for a more natural appearance during testing that’s super helpful if a testing administrator is watching you.

This can be an important benefit for some people, especially those taking drug tests for legal reasons or high-clearance jobs. However, it shouldn’t be the deciding factor when choosing a synthetic urine kit—there are plenty of ways to help yourself pass a supervised urine test without an expensive, specialized kit.

How does Monkey Whizz’s Retailer Support Compare to TestClear?

A cursory look at Monkey Whizz products’ reviews show very positive ratings overall—so far, so good. However, things get a little murkier when you delve further into the reviews themselves. A significant number of consumers use the kit for fetish purposes—no kink-shaming here, but that purpose doesn’t exactly align with ours, and those reviews don’t tell us anything about the kit’s ability to help you pass a drug test.

The reviews relating to drug testing are a little dicey. Many people have had success with Monkey Whizz, and it might work for you. However, if you’re facing a more advanced drug test, you may not be so lucky. This may have to do with a particular ingredient that may be included in Monkey Whizz—they’re a little cagey about clarifying whether or not it is a part of their product formula—biocide, which is a harmful chemical used to kill living organisms like mold and bacteria. 

What ingredients are used in Monkey Whizz vs. TestClear?

Biocide is a general term for a class of ingredients that interferes with the action of biological materials and particles. For drug testing purposes, these compounds interfere with the action of the antibodies that interact with THC and its metabolites to produce a positive result. This sounds like a good thing on the surface, but there’s a problem: Drug testing companies have caught on to this strategy, and many tests will pick up on the presence of biocides and flag the sample as being contaminated or tampered with, yielding a failing result.

Conclusion: TestClear vs. Monkey Whizz

For us, the possible presence of biocide is a big problem in urine substitution products, not because it will give a false positive every time, but because it introduces the unnecessary risk of a false positive. Since the whole point of using the substitution method is to eliminate as much risk of contamination as possible, this seems a bit self-defeating to us.

We prefer to use the Powdered Urine Kit from TestClear, which is formulated using the same ingredients as the synthetic urine used to calibrate drug tests, ensuring a clean result every time. The product is simple and straightforward to use—simply mix the powder with water in the included vial about an hour before your test, then activate the warmer and use it to bring the specimen to body temperature (using the included temperature strip to ensure the correct range is reached).

The TestClear kit includes enough powdered urine for an ample specimen, and its formula includes each of the markers that labs test for, including creatinine, uric acid, and urea. The TestClear formula does not contain biocides or other ingredients that could interfere with the action of the test and arouse suspicion.

It is true that the TestClear kit is not available in specialized kits for supervised tests the way that Monkey Whizz is. However, TestClear does carry supplemental products that will help you successfully use the substitution method for a supervised drug test when used in conjunction with their powdered urine kit. If you need help with a supervised test specifically, browse the selection at TestClear to find your ideal companion product.

Testclear vs. U Pass 8.4

What ingredients are used in U Pass 8.4 vs. TestClear?

The U Pass synthetic urine kit has been widely used by many people in need of a clean sample for years. On the surface, this might seem like a good thing—it’s worked before, right? And, in some ways, having a lot of experience gives a company an advantage. However, in the drug testing world, that’s not quite all there is to it—sometimes ingredients once thought of as safe can put consumers at risk.

This can become problematic if an ingredient in a cleansing or substitution product is picked up on a new version of a drug test and perceived as a drug, a drug metabolite, or a sign of dilution or tampering. In these instances, the sample would be considered contaminated and result in the potential loss of a job or other disciplinary action.

We suspect (though it’s impossible to know for certain without more details about U Pass’s specific ingredients) that this phenomenon is related to the recent reports we found of U Pass not working for consumers. One report even said that their use of U Pass returned a positive result for heroin (yikes!), which is much more difficult to explain away than a little THC.

While it’s unlikely that the U Pass kit would yield this result in every single drug testing panel available today (there are many, many different brands on the market, and it takes some time before everyone gets caught up to the same level of detection), it is a sign that this product has likely outlived its usefulness and needs a reformulation to be effective.

This highlights an important issue in drug testing: the need to stay current on technology and products. Because the landscape of drug testing and cleansing products is ever-evolving, the thing that worked a few months ago might be entirely obsolete now. As a consumer, it is crucial to make your decisions based on current information, not a batch of reviews from two years ago.

How Reliable is U Pass 8.4 compared to TestClear?

There is a chance that using a synthetic urine kit from U Pass would help you pass a drug test today. However, that chance becomes smaller and smaller as time passes, and more and more of the drug tests used by employers become more advanced. Over time, the U Pass 8.4 kit will be entirely obsolete, and it seems from online reports that its time as a reliable way to achieve a passing result has expired.

The TestClear Powdered Urine Kit, by contrast, has a proven track record (as of the time of this writing) of success in producing passing results by substitution. It is formulated with the same components as in the synthetic urine used to calibrate drug tests, guaranteeing a clean result (unless the samples were accidentally contaminated during mixing or storage—unlikely, but still worth mentioning).

How does U Pass 8.4 Retailer Support Compare to TestClear?

Finally, there’s the issue of the sellers themselves. U Pass is indeed available from many different retailers, often at a discounted price. However, the adage “you get what you pay for” is especially true of drug test cleansing products—you may not receive the kit by the day you need it, and it may not help you pass your test even if it does arrive in time.

TestClear, by contrast, ensures guaranteed delivery on all expedited shipping orders and takes the extra step of guaranteeing the efficacy of the products they carry. This creates a more secure purchasing experience and adds an extra layer of protection that other sellers can’t offer. We feel that this is important, especially in the high-stakes world of drug testing.

Conclusion: TestClear vs. U Pass 8.4

We also find the TestClear kit to be a bit more user-friendly than the U Pass kit. Unlike U Pass, TestClear’s Powdered Urine Kit is mixed when you are ready to use it, then heated using those adhesive toe warmers popular in colder climates in the winter. Unlike the microwave heating used with the U Pass kit, this method ensures that your sample won’t get too hot—the sample will be warmed slowly to body temperature. This method produces an even heat that does not compromise the integrity of the compounds within.

We also prefer the plastic vial included in the TestClear kit instead of the flexible plastic bag utilized by U Pass. While there are certain perks to the bag (it’s a little easier to conceal under clothing), it’s not the easiest to dispense, leading to spillage during testing. On the other hand, the plastic vial is much easier to use and allows for an extra filling to ensure an ample-sized sample for your test, further averting suspicion.

Purchase TestClear Powdered Urine

Ultimately, while it is technically true that you could chance it and try your luck with the U Pass or Monkey Whizz kits, why take the unnecessary risk? With the TestClear Powdered Urine Kit, you can ensure a passing result with ease and simplicity. While the upfront cost may be a bit higher for the TestClear kit, we feel the peace of mind is more than worth the extra investment. You–and your career—are worth it!

A General Note About the Drug Testing Industry

As we talk about choosing a drug testing product, we’ll need a certain level of understanding of the relationship between the drug testing industry and the companies creating products designed to “spoof” those tests. These two fields are locked in an arms race of sorts, a self-sustaining cycle that creates an ever-evolving line of products. As testing companies create tests capable of detecting things like dilution or substitution, cleansing companies reformulate their products to meet the requirements of the new tests.

Because the two industries are at constant war with each other, the product that worked last year might not work on Tuesday of next week, and what works for a small lab in Poteet, Texas, might not fly at a major testing lab in San Diego, California. Your odds are affected by where you are and the type of test you’ll be taking, but ultimately, it’s still a bit of a gamble every time.

With that in mind, it’s important to choose cleansing and substitution products that are on the cutting edge of drug testing technology. Using the best products available will give you the best chance of passing your drug test, even accounting for all other factors.