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THC vs. THCA: What's the Difference?

THC vs. THCA: What's the Difference?

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Within the hemp space, there always seems to be a "new" rising cannabinoid that gains the attention of enthusiasts. Most of us are familiar with tetrahydrocannabinol, normally called "THC" or sometimes "delta-9." It's the primary psychoactive constituent of cannabis that delivers the plant's most active effects.
 
But what is this "THCA" everyone is talking about, and how does it compare to THC? Read on as we explore everything you need to know about THC vs. THCA in regards to their chemical structures, legality, and effects. 

What is THCA?

THCA flower buds macro

THCA stands for "tetrahydrocannabinolic acid." Quite the mouthful, right? But, in essence, the easiest way to understand THCA is that it's the precursor, or the "raw form," of THC. On a molecular level, THCA contains 22 carbon atoms, 30 hydrogen atoms, and four oxygen atoms. When exposed to heat, the carboxyl group on THCA will separate, and as a result, THCA will turn into THC. This process is known as decarboxylation

THCA is a naturally occurring cannabinoid, a compound found in cannabis plants. THCA can specifically be found in raw cannabis, both hemp and marijuana. The terms "hemp" and "marijuana" have no basis in science but are rather legal terms used by both the federal government and state governments

Hemp is merely cannabis with a 0.3% or lower concentration of delta-9 THC; marijuana contains any concentration higher than this. So when you stumble upon a product like "27% THCA hemp flower," it's abundant in THCA, but the actual delta-9 THC level is at or below 0.3% by dry weight; therefore, it's still considered federally legal hemp.

What is THC?

THC (tetrahydrocannabinol) is the most active compound offered by the cannabis species. Delta-9 THC contains 21 carbon atoms, 30 hydrogen atoms, and two oxygen atoms per molecule. When most people use the term "THC," they are usually referring to a cannabinoid with the full name of "delta-9-tetrahydrocannabinol." Though this is accurate in most instances, there are other variants of THC out there, such as delta-8, delta-10, and others.
 
As mentioned earlier, the concentration of delta-9 THC is the only factor separating hemp and marijuana. Hemp plants contain a small amount of delta-9 THC compared to marijuana; however, you can have legal hemp-derived delta-9 products such as delta-9 edibles so long as the concentration is at or below the compliant amount on a dry weight basis.

THCA vs. THC Differences

What are the main differences between THC and THCA? For starters, they are separate cannabinoids with their distinct molecular compositions and structures. For example, delta-8, delta-9, and even CBD are isomers, meaning these cannabinoids are "built" out of the same building blocks, but in different chemical structures. THCA is not an isomer of these cannabinoids because it contains more hydrogen, carbon, and oxygen. 

In a legal sense, they differ because, according to the 2018 Farm Bill, Uncle Sam only cares about the concentration of delta-9 THC, not THCA, when it comes to distinguishing between what is hemp (federally legal) and marijuana (a controlled substance). The appeal of THCA flower is that it offers inhalable delta-9 THC while still being Farm Bill compliant. Still, several local governments have implemented restrictions on THCA flower products for this very reason.

They are closely related because THCA does eventually convert to THC when heated. In other words, THC is the chicken, and THCA is the egg. 

THCA vs. THC Effects

Generally, Delta-9 THC will bind to CB1 cannabinoid receptors in the central nervous system to produce the following effects: 
  • Relaxation
  • Euphoria
  • Laughter
  • Sleepiness
  • Fascination
  • Creativity
  • Increased appetite
Of course, effects can differ based on your age, weight, gender, and unique endocannabinoid system, but you get the point.

But what are the effects of THCA? Well, scientific studies suggest that there may be potential applications for THCA in medicine, but the results are inconclusive as they only involve animal trials. But in terms of experiential effects, there are none unless you decarboxylate it, but when you do that, it's no longer THCA but rather THC

When you consume a delta-9 edible, it's not actually delta-9 causing the effects you experience afterward. Your body converts the delta-9 into 11-hydroxy-THC, which offers more pronounced effects for a longer duration but at the cost of a slower onset. 

Conversely, when you smoke THCA hemp flower or vape THCA liquid diamonds, the THCA converts to delta-9 THC, which undergoes no conversion process after decarboxylation, offering a faster onset with lighter effects lasting a shorter duration. 

For example, let's say you decided to eat a handful of  THCA flower out of the bag. First of all, that would taste gross and grassy. And finally, you wouldn't feel anything at all (except, hopefully, a little shame), although research suggests that THCA has a minute binding affinity for CB1 receptors and CB2 in the endocannabinoid system

Again, we cannot state enough that THCA is merely the precursor to THC, which converts to THC when heated. Discussing the "effects" of THCA vs. THC is pretty irrelevant. And if anyone tries to sell you THCA gummies, just know they won't "hit" the way you might expect.

THCA vs. THC: Which is Stronger?

macro of a thca flower bud

In regards to potency, Delta-9 THC is generally considered stronger than THCA. Scientifically speaking, Delta-9 has a stronger binding affinity to both the CB1 and CB2 receptors in the endocannabinoid system than THCA does. This equates to more pronounced mind and body effects, i.e. "strength."

However, comparing them in this way does not really make any sense because THCA decarboxylates into THC. If you consume an inhalable THCA product, such as a 5g THCA liquid diamond disposable, you are essentially feeling the effects of THC.

But if, for some reason, you see an edible cannabis product that a vendor has labeled as containing THCA, you are straight-up getting ripped off. 

Conclusion

THCA is the precursor to THC, the popular cannabinoid known for its effects such as laughter, relaxation, euphoria, and sleepiness. Comparing the two's experiential effects doesn't make sense because you would only feel something if you consumed THC, not THCA. THCA needs to be decarboxylated with heat to become THC, and in that case, you would feel the effects of THC. In other words, you need heat to convert THCA into THC. 

The most crucial difference is that they are two separate molecules, not even isomers. With that in mind, because THCA is different from delta-9 THC, you can have higher concentrations of it as long as the delta-9 THC is at or below 0.3% by dry weight, which makes it a federally legal product. However, its legal status varies by state with THCA flower, in particular, restricted in some places.

Until next time, happy exploring and Mind Your Mind.

FDA Disclaimer: The statements made regarding these products have not been evaluated by the Food and Drug Administration. The efficacy of these products has not been confirmed by FDA-approved research. These products are not intended to diagnose, treat, cure, or prevent any disease. All information presented here is not meant as a substitute for or alternative to information from health care practitioners. Please consult your healthcare professional about potential interactions or other possible complications before using any product. The Federal Food, Drug, and Cosmetic Act requires this notice.

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