What Is CBGa in Cannabis?
A licensed producer explains what the number on your COA actually is.
By Alex Rumi, Co-Founder, GOOD BUDS, Written April 27, 2026 - Updated September 18, 2026
CBGa (cannabigerolic acid) is the first cannabinoid the cannabis plant makes, and the starting point for THCA, CBDA and CBCA. Most finished flower shows 0.5 to 1% CBGa or less on a Certificate of Analysis. Mango Cake, a house-bred strain from GOOD BUDS on Salt Spring Island, BC, tests at 2.4 to 3.5% CBGa.
Our Mango Cake strain consistently tests between 2.4 and 3.5% CBGa, several times what most cannabis COAs show. Here is what that number actually means, where it comes from in the plant, and why we put it on the label.
Most cannabis Certificates of Analysis (COAs) include CBGa. Most people skip right past it. We did not, because the data was real, it was consistent lot to lot, and the through line was clear. CBGa has been elevated in every Mango Cake harvest since we first brought flower to market in 2020, going back to Mango Taffie, the original GOOD BUDS house strain Mango Cake descends from.
As a licensed producer in Canada, we cannot tell you what CBGa does for a person. We can explain what you are looking at when you see it on a COA.
CBGa Is Where THC and CBD Begin
The cannabis plant does not start out making THC. It starts out making CBGa, cannabigerolic acid, and then converts it into everything else.
CBGa is the first cannabinoid the plant synthesises. As the plant matures, enzymatic reactions convert it into THCA, CBDA, CBCA and other acidic cannabinoids. Once those acidic forms are exposed to heat, through smoking, vaping or cooking, they decarboxylate into the neutral forms most people know: THC, CBD, CBC.
So by the time you are holding finished flower, most of what started as CBGa has already converted. That is normal. A fully mature, harvest-ready cannabis plant typically shows CBGa residuals in the 0.5 to 1% range or lower.
Mango Cake sits at 2.4 to 3.5% CBGa across tested lots.
The biosynthesis pathway is well documented. CBGa was described as the acidic precursor to both THC and CBD in a 2022 review in Molecules, with conversion driven by enzymatic activity and accelerated by heat and light. A 2024 review in Pharmaceuticals covers the same pathway and surveys the broader state of CBG and CBGa research, worth reading if you want to go deeper.
How CBGa Ends Up on Your COA
Canadian licensed producers test every lot before sale. The resulting document, a Certificate of Analysis or COA, lists cannabinoid content by percentage of dry weight.
Most people read the THC number and stop there. Fair enough: THC percentage is still the primary driver of purchasing decisions for most consumers. But the full cannabinoid panel tells a more complete story about what is actually in the product.
CBGa is the acidic form found in raw cured flower. CBG is what it becomes after heat is applied. For unheated flower, CBGa is the more accurate number to read on a COA.
On Mango Cake's COAs, the CBGa figure ranges from 2.4 to 3.5% depending on the lot. That puts the full cannabinoid content higher than the THC number alone would suggest, and it carries through to the full-spectrum extracts we make from this strain, the Mango Cake live resin and cured resin vapes.
Our other strains run elevated CBGa too. Gluerangutan and Timewarp typically test in the 1 to 2% range. It is a through line across the portfolio, which is part of why we started including it on all our labels, not just Mango Cake's.
Why Mango Cake Holds So Much CBGa
Genetics is the obvious starting point. Some cultivars are simply wired to retain more CBGa, where the conversion to THCA and other cannabinoids does not complete the same way it does in other strains.
Mango Cake's lineage traces back to Mango Taffie, a GOOD BUDS original cross of LA Affie x Hawaiian, bred by Tyler before GOOD BUDS was even a licensed operation. Mango Taffie was our first house strain and the first product we brought to market in 2020. It had elevated CBGa on every COA. We did not print that number on the label back then, because the regulations on label space did not really allow it. But it was always there in the lab data.
When Tyler crossed Mango Taffie with Wedding Cake to develop Mango Cake, the elevated CBGa came with it. That has held across every tested lot since.
Beyond genetics, Tyler has a theory about flowering time. Mango Cake is a slow finisher. It comes in weeks after Gluerangutan in the sun-grown field, and it is late by indoor standards too. His thinking is that CBGa conversion is partly a function of time: a slower-maturing plant may not complete the full conversion to THCA before harvest that a faster-maturing cultivar does. Many commercial cannabis strains have been selected, over generations, partly for speed, because faster cycle time means more harvests per year, which matters at scale. Mango Cake was bred for expression, not speed.
Tyler is the first to say that is a hypothesis, not a conclusion. The flowering-time connection makes intuitive sense, but we do not have the controlled trial to prove it.
We also grow in living organic soil, a continuously cultivated, biology-rich growing medium, and that soil does things to plant chemistry we notice but cannot always fully explain. Whether the living soil plays any role in how CBGa converts, we do not know. It is possible. It is also possible it is entirely genetic.
What the Research Says, and Where We Stop
There is a growing body of published research on CBGa and CBG. Researchers have examined how these cannabinoids interact with various biological systems and how they differ from better-known cannabinoids like THC and CBD. The two reviews linked above are reasonable starting points if you want to read the primary literature, and PubMed is the right place to keep going from there.
What we will not do is summarise that research here in terms of what CBGa "does". Under Canada's Cannabis Act, licensed producers cannot make health or therapeutic claims about cannabinoids. That applies equally to well-known ones like THC and lesser-known ones like CBGa. If you are trying to make informed decisions about what you consume, that is a conversation worth having with a healthcare practitioner who knows your situation.
Why We Think the Number Is Worth Knowing
Two strains at 30% THC are not the same product if one shows 3% CBGa and the other shows 0.4%. The full cannabinoid panel is part of what makes a cultivar distinct. It's part of the plant's chemical fingerprint.
We started printing CBGa on Mango Cake packaging because the data was real and consistent lot to lot. Retailers and budtenders were asking what was actually in the product, and they deserved an honest answer. The number had been on the COA since 2020. At some point it just made sense to put it on the label. If you already know what CBGa is, the number is interesting on its own.
If you don't, you now have something specific to look into. Either way, it is a more complete picture of what is in the jar than THC alone.
About Mango Cake
Mango Cake started as a cross Tyler made before GOOD BUDS was licensed: Mango Taffie, an original GOOD BUDS strain of LA Affie x Hawaiian, crossed with Wedding Cake.
COA-verified lots test at 28 to 32% total THC and 2.4 to 3.5% CBGa. The flower is terpinolene-dominant, with ripe mango and tropical citrus at the front and a creamy vanilla note from the Wedding Cake side on the finish. Mango Cake flower and pre-rolls are grown indoors in living soil. Our sun-grown Mango Cake goes only to vape inputs.
FVOPA Certified Organic. Salt Spring Island, BC. Available through licensed retailers in BC and Alberta and Ontario.
Alex Rumi is co-founder and Chief Strategy Officer at GOOD BUDS, a FVOPA Certified Organic cannabis farm on Salt Spring Island, BC. He has worked in the licensed Canadian cannabis industry since 2017.
This article is for informational purposes only. GOOD BUDS does not make health or therapeutic claims about any cannabinoid. If you have questions about cannabis and your health, speak with a licensed healthcare practitioner.
Sources
Nacca G., et al. (2022). "Pharmacological Aspects and Biological Effects of Cannabigerol and Its Synthetic Derivatives." Molecules. PMID 36397993. https://pubmed.ncbi.nlm.nih.gov/36397993/
Bian Y., et al. (2024). "Cannabigerol (CBG): A Comprehensive Review of Its Molecular Mechanisms and Therapeutic Potential." Pharmaceuticals. PMID 39598860. https://pubmed.ncbi.nlm.nih.gov/39598860/
GOOD BUDS third-party lab COA data, Mango Cake indoor lots, tested 2025 to 2026. Internal reference.
FAQs
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CBGa (cannabigerolic acid) is the first cannabinoid the cannabis plant produces. As the plant matures, enzymes convert CBGa into THCA, CBDA and other acidic cannabinoids. Most finished cannabis flower shows low residual CBGa, around 0.5 to 1% or less. Some cultivars, including Mango Cake, retain more.
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Most finished cannabis flower tests below 1% CBGa, and consistent readings above 2% are uncommon. Mango Cake tests at 2.4 to 3.5% CBGa across COA-verified lots.
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CBGa is the acidic form, which is what the plant holds before any heat is applied. CBG is what CBGa becomes through decarboxylation, which happens with heat. On a COA for cured flower, CBGa is the relevant figure.
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It comes from the genetics, specifically from Mango Taffie, our original house strain, which showed the same elevated CBGa before Mango Cake existed. The slow flowering cycle may also play a role: a plant that takes longer to mature may retain more residual CBGa than one bred for speed. We grow in living soil, and we do not know whether the soil plays any part.
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Standard drug screening tests look for THC metabolites. CBGa and CBG are not typically included in those panels. Mango Cake is a high-THC strain, so CBGa content makes no difference to a THC screen. If drug testing is a concern for your situation, check with the relevant authority rather than relying on this as guidance.
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No. Under Canada's Cannabis Act, licensed producers cannot make health or therapeutic claims about cannabinoids. We can tell you what CBGa is, where it comes from in the plant, and what the COA shows. What it does in the body is a question for the published research and your healthcare practitioner.
