Decarboxylation: The Best Guide You’ll Ever Read
June 17, 2018
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Decarboxylation: The Best Guide You’ll Ever Read

Cannabis 101
MarijuanaBreak Staff MarijuanaBreak Staff / Updated on June 17, 2018

Decarboxylation

Despite its growing popularity, there are still a few basic cannabis facts that people don’t understand. Namely, the fact that there is a good reason why users heat marijuana before consumption. If you were to consume a bag of ‘raw’ weed, the effects would be disappointingly mediocre.

However, if you were to believe movies and TV shows, doing so should cause you to hallucinate and attempt to cross the Grand Canyon’s chasm using mind power alone. But in fact, the decarboxylation process is what turns marijuana from plant to party guest, as it brings weed’s psychoactive properties to life.

Decarboxylation: Make Sure This is Done with Your Weed Before Using it in Edibles

When you heat cannabis, you help activate the psychoactive compounds that lie within. If you decide to make edibles with your weed supply, you must decarboxylate it first. If you fail to decarb your weed, you’re doing little more than adding plant matter to your cookies; it is the heating of cannabis that gives your hash brownies their kick.

Is Raw Cannabis Useless?

Not at all! Your herb still has some uses when it is raw. For the record, raw cannabis is plant matter that has not been dried and cured. If you go through that particular process, a small amount of decarboxylation occurs.

As it happens, there are several health benefits attributed to raw, uncured marijuana. The cannabinoid acids it contains are used as an anti-inflammatory and the herb itself is filled with the types of vitamins and minerals found in other greens. If you decide to use raw weed, choose buds that have been freshly picked, or fan leaves. It is also possible to store it in your fridge for about as long as you would a ‘green’ such as kale.

It is important to monitor your raw cannabis because it is prone to wilting and mold after a relatively short time. This is particularly the case for densely packed flowers that are exposed to moisture. In other words, use your raw weed as soon as possible, because it will denature and lose its potency as it ages. There are cases where medical marijuana patients have been happy with the results when they drink raw cannabis smoothies, proving that it is definitely NOT useless.

What is Decarboxylation?

However, raw cannabis does not compare to weed exposed to heat. The trouble with raw herb is its non-psychoactive nature. To get the effects you’re looking for, notably the ‘high’, your marijuana has to be heated. As we mentioned above, drying and aging also releases psychoactive compounds, just not as many as heated herb. The term ‘decarboxylation’ refers to the chemical reaction that removes a carboxyl group and releases carbon dioxide.

To achieve decarboxylation, all you have to do is apply some heat and the effects produced are fascinating. As you know, the main psychoactive compound in weed is THC, but there is little of it in raw herb. Instead, you’ll find a lot of THCA, which is non-intoxicating. When you add heat to your marijuana however, you transform THCA into THC. This happens because the decarb process removes the COOH group from the THCA molecule by releasing water and carbon dioxide, turning it into THC.

The process happens more slowly when you cure cannabis, which is why it is necessary to use an oven when decarbing weed to place in your edibles. Incidentally, when you decarb weed, you reduce the botulism risk in your edibles. When you don’t go through the process correctly, botulism bacteria can grow in your butters or oils.

Every time you light up a joint or vaporize your weed, you are automatically decarbing the herb. You convert one compound into another and transform a regular plant into one capable of getting you stoned. During the decarboxylation process, you remove a carboxyl group from THCA and, without that group, THC can bind to the cell receptors in your body and brain freely.

Why Do You Need to Decarb CBD Strains?

You would be forgiven for thinking that CBD decarboxylation is unnecessary. After all, why do you need to decarb a strain that’s already non-psychoactive? However, the same rules apply because raw cannabis contains the acid form of CBD, known as CBDA. Again, CBDA has its own health properties but it is nowhere near as effective as its decarbed cousin.

The decarboxylation of CBD increases its bioavailability. In other words, your body will be able to use the compound right away and it should work faster. If you consume CBDA, your body is forced to work extra hard to break down the molecule and it also uses the acid form of CBD differently.

There is some dispute over the right decarboxylation temperature of CBD, although it is typically higher than that of THC. Bear in mind that its boiling point is between 320 and 356 degrees Fahrenheit, so the latter should be the maximum temperature you use, with most users opting for less than 320 degrees. As for timeframe, it depends on the temperature! Certainly, you should be aiming for between 30 and 60 minutes.

Decarboxylation of Weed

There are a multitude of ways to bring about the decarboxylation of weed, but we’re going to show you the most basic one. You’ll need the following equipment:

  • An oven
  • A baking sheet
  • Parchment paper
  • Leaf trim, ground bud, or kief.

If you elect to use buds, grind them coarsely before following these steps. In this example, we used 40 grams in a bid to turn it into coconut canna-oil.

Make sure you preheat the oven. We will discuss the right decarboxylation weed oven temperature in more detail in the next section. In this example, we set the oven to 220 degrees Fahrenheit. Place the parchment paper on the baking sheet and spread your marijuana across it. Make sure you break up larger pieces with your hands if necessary.

Place the sheet in the oven for approximately 30 minutes to begin with. This is the right length of time for well-dried weed, but if you’re using fresher marijuana with more moisture, it could take up to 90 minutes at this temperature. Some users invest in a hygrometer to check the level of moisture in their herb. It is easy to use; place the weed in a closed container with the hygrometer. After the weed is dry enough, leave it to completely cool. The decarboxylation of the weed is complete!

Decarboxylation Temperature

If you ask 20 different users what temperature they decarb their weed at, don’t be surprised to receive 20 different answers. What we can tell you is that the lower the decarboxylation temperature, the longer it takes. To be frank, this is a good thing because, if your decarboxylation temp and time are too high and too long respectively, you will ruin your herb.

Remember, when you’re using weed in edibles, you want to get every last piece of goodness provided by the plant; this means compounds such as THC and CBD, along with terpenes and flavonoids. The boiling points for all of these compounds varies markedly. Here are just a handful of examples (all temperatures are in Fahrenheit):

Cannabinoids

CBC: 428 degrees.
THC: 314.6 degrees.
CBN: 365 degrees.
THCV: 428 degrees.

Terpenes

Myrcene: 330 – 334 degrees.
Limonene: 350.6 degrees.
Linalool: 388.4 degrees.
a-pinene: 312.8 degrees.

Flavonoid and Phytosterols

Beta-Sitosterol: 273.2 degrees.
Cannflavin A: 359.6 degrees.
Apigenin: 352.4 degrees.
Quercetin: 482 degrees.

It is advisable to keep your decarboxylation temperatures on the low side to preserve terpenes. There are also compounds that are volatile and evaporate at higher temperatures. The result is foul odors and an unpleasant taste. If you plan to preserve your terpenes, keep the temperature in the 200-300 degree range.

Now that we know the key to faster decarboxylation is greater heat (within reason), it should be a straightforward process, right? Unfortunately, it isn’t quite as easy as that! The existence of another mechanism means we have to control decarb temp very carefully indeed.

When we heat weed and turn THCA into THC, or CBDA into CBD, we also convert THC to CBN at a quicker rate. Once we reach 70% decarb, THC gets converted into CBN at a faster rate than the conversion of THCA into THC. In other words, when we go beyond 70% decarboxylation, THC levels apparently start to fall off quickly, as you can see in this chart.

Decarbing

As helpful as graphs are, there is always an issue with the interpretation of data. For instance, the graph above relates to marijuana extract data. It transpires that the temperatures used for kief, bud or trim would be different. Also, the graph was created in 1990 and was a decarb of a hexane extract in an open container on a hot plate! With modern equipment, it is possible to reach 100% decarb without damaging your THC content.

The mystery of decarbing temperature was somewhat solved thanks to the efforts of Marijuana Growers HQ. In 2012, they tested cannabis trim and kief at 240 degrees for 30 and 60 minutes. The results are in the table above.

They chose 240 degrees because, during their research, they discovered that the vapor point of all major terpenes, flavonoids, and cannabinoids was over 246.2 degrees. As consumer grade ovens are not that reliable when reading temperatures, they played it safe by staying a few degrees below.

According to the results, 30 minutes was not long enough to completely decarb either the trim or the kief. The latter had reached 90% but the former only managed 60%. Both were very close to 100% once the hour mark had been reached.

Decarboxylation Methods Investigated

It is assumed that the oven is the best way to decarb, but is this really the case? Bear in mind that most ovens will fluctuate by 10 degrees in either direction. When using the oven in the 250-400-degree range in particular, if the heat is 10-15 degrees more than what you’ve set, the result could be the loss of important compounds. Incredibly, you could lose up to 33% of your THC via oven decarboxylation.

The crockpot/water bath method is a popular one because water boils at a consistent temperature of 212 degrees. The temperature also fluctuates less. The problem is that, while the max temp you use here will preserve all compounds, it is impossible to achieve a full decarb. Decarboxylation is NOT a linear process, as the last part of THCA to THC conversion takes longer. When you use boiling water, the weed is exposed to heat for too long and this causes degradation.

There is a product on the market called the Nova which promises to decarb your weed while preserving 100% of THC. It has the lab tests to back up this claim, so it may be worth buying if you’re dedicated to keeping the strength of your weed intact.

The other issue with decarb charts, graphs or anything else showing this kind of information is a lack of knowledge of the precise starting point of the decarb process. Therefore, the times and temperature figures shown are always an average. Remember, you can’t place dry material in an oven at a specific temperature and expect it to remain at that exact level for the duration of the decarbing process.

Decarboxylating Kief

First of all, it is important to know what kief is! It is the name given to the crystallized structures that stick to the surface of pure weed. In other words, it is cannabis pollen that acts as a defense mechanism to keep pests away. It is extremely potent, so if a predator consumes some kief, they have an experience that persuades them to steer clear in future! It is also one of the most popular parts of weed for edible creation.

If you decide to try kief decarboxylation, grind the weed into flakes and sift the kief away from the plant parts. It takes a little while, but you should get plenty of sticky goodness for your troubles.
Kief tends to decarb faster than bud, meaning you can afford to use a lower temperature. Once you have spread it over the sheet, follow the steps mentioned earlier in the article. Place it on a parchment sheet on a baking tray and put it in the oven at between 240 and 300 degrees. It should be fully decarboxylated after 45-60 minutes.

Final Thoughts on Decarboxylation

Although it is one of the most important parts of enjoying marijuana, decarboxylation is also one of the least understood. If you aim to get high or fully benefit from the medical properties of the plant, it has to be decarboxylated to transform the THCA, CBDA and other cannabinoids into the compounds that have the greatest effect.

As soon as you light a joint or vape your weed, you have decarbed it. However, those who use cannabis in edibles have to go through this process to ensure their products pack a punch. Although there is some merit to consuming raw cannabis, it is a poor relation to the decarbed version. We hope this guide assisted you, and maybe you now realize why the edibles you made last week didn’t have the desired effect!

Article Sources
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22 comments
  1. Damian
    Non Psychoactive CBD Oil

    How do you make non Psychoactive CBD oil from flower when decarboxylating activates THC?

  2. Zenfast
    What is the right thing anyway!

    In obtaining one thing you lose another….weed has different properties at different times and in different states…relentlessly following .. VON ! Method… is always a mistake…if your weed is cured .guess what ? It’s cured. my weed never lacked thc and modern weeds are bathed in it… what’s up with you folk. Terpenes flavonoids delicate aromas different ratios of individual plant products .same things major differences..destroying the beautiful results of all your work trying to jerk the notional thca to some other notional thc level… I’ll bet that loads more thc has been destroyed by this practice than created ! And while you have me moaning… stop it with the ISO.. it says not for internal use right there on the bottle.. use ethanol… please please please…. use ethanol.

  3. Jamie

    Guys I’m a long term smoker but want to make some coconut oil capsules for my pain. (fibro) do I need to decarb the bud before mixing n heating with coconut oil or dried bud straight into the coconut oil and heat for for several hours?

    1. Richard

      Yes friend you do still need to decarb, only answering because similar situation and have tried both, hope that helps you mate

  4. Enpsyched
    Will exposure to decarboxylation process make you fail a drug test?

    I wish to make edibles, and have been hesitant because my partner has random drug testing. What I would like to know is if she’s in the home while the process of decarboxylation occurs, will it make her fail a test?

  5. Dan Guru
    It is easier to decarb after extraction rather than before

    I find it easier to do the extraction first and the decarb second. By having the active ingredients suspended in a solution, I have good control of the temperature and observe the progresss of decarbing. Using coconut oil, I usually stop the heat, once the bubbles slow down. I have had good results at all temps over 260

  6. Lucas

    are the decarb temp and times the same when using rosin?

  7. Steve
    Decarb in pressure cooker?

    Ihave thought of putting leaf into a vacuum sealed bag and using pressure cooker and either using 115 celcius (239 f) or 125 celcius (257 f) for 30-60 min. Anyone know if that would work?

  8. David J Lennox

    I use a soxhlet rig with 99.999 ISO. Fresh bottles. I run for 6 hours. I then distill the alcohol off so I can reuse it. I de-carb during the distillation phase. When the solvent is finished boiling I just let it run up to whatever temp needed. The boiling points of the individual fractions are very high so they won’t cook off during the de-carb. I only run the temp up. Once reached de-carb is complete. You must have a good stirrer with a constant temp control and the proper glassware if you wan to succeed.

  9. Sean
    Mixed Message

    This is a very informative article, and thank you for the research and care that went into it. However, I’m confused by a rather basic contradiction:

    In the Decarboxylation of Weed section you state 30 minutes at 220F is enough for cured/dry weed, but could run up to 90 if less cured/dry.

    In the Decarbing Kief section you state, “Kief tends to decarb faster than bud, meaning you can afford to use a lower temperature.” Which makes good sense. But then you say it should be placed in the oven at 240-300F for 45-60 minutes.

    Longer time, higher temp on something that should decarb easier than flower.

    Since this is the central question everyone has about Decarboxylation, and probably the main reason most of us read this in the first place, just curious if you cared to comment. Thank you again.

  10. Xander
    Decarboxylation. The latest fad.

    Decarboxylation. The latest fad. You’d be amazed at some of the stories I’ve heard from budtenders which are complete and utter hogwash. Yes, if you pull a bud off of a plant and consume it, you’re not going to feel much. Who does that? Nobody I’ve ever known and I’ve been partaking in the herb for 50 years. Does decarboxylation improve the quantity of available THC? I imagine it does. But I don’t imagine it’s been around for 5,000 years, which is the length of time Human Society has been consuming cannabis in one form or another. Take bhang in India. The bugs that going to bang are dried and cured like we’ve been doing since we were living in caves. Overdoses common. Decarboxylation? Not necessary. At the bottom of every article I’ve run across their trying to sell me something. Read between the freaking lines. One final point is that once the herb is cured properly baking it into edibles will have the same effect as whatever cool process you’re promoting. For that matter, for example bhang, the body is 98 degrees internally. Do I have to draw you pictures?

    1. bubble

      Xander…grab a crayon and draw a picture

    2. Joe

      Xander, decarboxylation is hardly some new fad. Humans have been doing this to their cannabis for thousands of years. Why do you think we cure or smoke cannabis? It’s because both curing and smoking decarb the bud, although given the crude and rather unoptimzied manner in which each of these methods does so, there is a lot of loss involved.

      The only thing that has changed is as our understanding of the underlying principles has improved so we now have come up with some more effective ways to decarb our cannabis rather than just setting it on fire or leaving in a dry, dark place for months.

      Do we need to some fancy new way to decarb our bud for it to work, no, but it certainly does help. It’s the same way you can smoke fresh, uncured bud if you like and it will still work despite the fact you skipped decarbing it with a proper cure, but it won’t be as potent as if you had cured the bud first.

  11. MEJ
    What have I done wrong?

    Hello,
    I decarbed a large qty of trim and popcorn buds then made a tincture with ever clear. It’s been a week and I have tried a little every day and I am not feeling anything. I have tried under the tongue and just taking shot (both are disgusting!). At first I had only 1 tsp (5ml) and have increased dosage (last night) to 4 tsp and nothing happened?
    I decarbed @240 for 30 – 40 mins. 30 mins with oven on and left it in for another 10 – -15 mins. With door closed.
    If I didn’t decarbed long enough can I put it back in the oven for another 15 mins?

    1. Mark

      MEJ,

      Your decarb process is fine. It’s the alcohol extraction process that likely isn’t working. Alcohol is not the best solvent for THC and CBD, especially when it isn’t pure (everclear is anywhere from 80 – 95% pure alcohol) – linear alkanes like hexane or butane are much better solvents for extraction.

      1. Arlie Anderson
        everclear

        the first time i did a everclear tincture i gave my wife 4 full droppers in a shot glass with a little water, after an hour she thought she should go to the hospital. lol she was ok but really stoned.

      2. Nancy Lefeaux
        Potent Tinctures Disappointing

        Like MEJ above (Nov. 20, 2018) I have been making tinctures with Everclear and finding them not very potent and slow acting. I decarb 3 oz. bud in 1 oz. batches in the toaster oven at 225 degrees F for 50 minutes then cool completely in the freezer. I mix the 3 oz bud with 1 bottle Everclear and put it in my Magical Butter Machine at 160 degrees for 8 hours. I have to use at least 3 droppers full of the tincture to get the effect I want and often I don’t feel anything for at least 2 hours. The first time I did this I did not feel anything for 3 hours, then I was in full chair lock for the rest of the evening. I’ve been reading about tinctures and feeling puzzled that some people get instant results from one or two drops.

        1. Andy
          Extracting dry herb vape leftovers

          I use a dry herb vaporizer and instead of throwing the tailings away I dump them into a Mason jar of 99% isopropyl. The tailings are already decarbed, and the resultant goo left over after evaporating a splash in a pie plate will kick my butt!

        2. Jim
          Differences are too many to isolate any particular problem.

          Different metabolisms will digest and absorb at different rates. There’s also the strength of the original bud. I’m starting this year with a notebook, volume measurements, temps, times and results. Had a good crop so I’ll try variations until I get it down right. Rec is legal here in MA so no problem growing. Using Kona Gold (S) seed.

    2. Tegridy

      How much bud and everclear did you use?
      It is important to wait a month at least, shake the mixture once a day. In the end of the process you can evaporate the everclear over a water bath (only on electrical stove).
      From my experience the taste is very bitter and I personally recommend making canabutter as it tastes much better and has the maximum effect on the body. Also it is very ease to dose
      Good luck

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