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Dale blog imageAuthor: Dale Hewett
What is THCA-B featured
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If you are familiar with cannabis, there are chances you might have heard about Tetrahydrocannabinol (THC). THC is also known as delta-9-tetrahydrocannabinol, which is a cannabinoid within the cannabis plant that is responsible for its intoxicating effects on users. There are many different variants of THC, which is where delta-9-tetrahydrocannabinolic-acid-B comes into play. This acidic cannabinoid is not well known, but we’ll cover the little that scientists have discovered about it.

What is Delta-9-Tetrahydrocannabolic-acid-B (THCA-B)?

THCA-B is a cannabinoid that has always been confused with THC, and THCA-A.

THCA-A was first identified in 1965 by Professor Friedhelm Korte at the Univerity of Bonn. 4 years later, in 1969, a second THC acid was discovered by Raphael Mechoulam from the University of Jerusalem. The second acidic form of THC called ‘isomer 4-carboxy-THC’ was later named delta-9-tetrahydrocannabinolic acid B (THCA-B). 

THCA-B is only present in extremely concentrated samples of things like hashish that have little or no THCA. The weight of overall THCA-B concentration is said to be lower than 0.5%. 

Research has made it known that THCA-A is first synthesized by the cannabis plant. As a matter of fact, it is the primary reason behind many of the pharmacological studies that exist. THCA-B, on the other hand, has better stability, and it crystallizes more readily than THCA-A. This attribute makes THCA-B a compound worthy of study. 

It’s difficult to nail down specific research on THCA-B, because most researchers simply used the term THCA as a blanket cannabinoid. This made finding information on this cannabinoid pretty tough.

How THCA-B Works in the Body

There is little or no knowledge on how THCA-B works, but one can assume that being a precursor to THC, it shares the same mechanisms of action.

Due to the extra acid group of THCA, the molecule does not attach to CB1 cannabinoid receptors, as THC does.

This is why THCA doesn’t give a psychoactive effect. THCA, however, attaches to the TRPM8 receptor (the one that makes us experience a sensation of cold when we taste mint) and activates the TRPA1 receptor (which makes us feel the spiciness when we eat things like mustard or cinnamon).

The therapeutic effect of THCA may be caused by its blocking MAGL enzymes. This type of enzyme is responsible for breaking down the cannabinoids produced by the body, which binds to CB1- and CB2 receptors. Unfortunately, not a lot of research has been done, making it unclear how exactly THCA works.


There is an insufficient study on the medicinal properties of THCA-B. But for the closest compound, THCA it is believed to offer various minor medicinal benefits.


THCA-B has far greater stability than THCA-A, and it crystallizes more readily. Did you know that two isomers in regards to THCA were found? These isomers are 2-COOH-THC (THCA-A) and 4-COOH-THC (THCA-B).


Tetrahydrocannabinolic acid reduces nausea-induced conditioned gaping in rats and vomiting in Suncus murinus,

Non-psychotropic plant cannabinoids: new therapeutic opportunities from an ancient herb,

Tetrahydrocannabinolic acid is a potent PPARγ agonist with neuroprotective activity.

Non-THC cannabinoids inhibit prostate carcinoma growth in vitro and in vivo: pro-apoptotic effects and underlying mechanisms.


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About the Author - CBD Expert Dale Hewett

Dale Hewett is the owner and founder of New Phase Blends. He discovered his passion for CBD use after suffering from injuries sustained while on Active Duty in the US Army. His number one priority is introducing the same CBD products that he himself uses for relief to others who can benefit from them.

Dale holds a Master Degree of Science, and is the inventor of the popular, CBD-based sleep aid known as ‘Sleep.’ He’s given multiple lectures on CBD to institutions such as Cornell’s MBA student program, and Wharton’s School of Business.

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