What Is CBGa in Cannabis?
A Licensed Producer Explains
By Alex Rumi, Co-Founder, GOOD BUDS
Our Mango Cake strain consistently tests between 2.4% and 3.5% CBGa — three to four times the typical 0.7–0.9% range you'll see on most cannabis COAs. Here's 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 didn't, 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 can't tell you what CBGa does for a person. We can explain what you're looking at when you see it on a COA.
CBGa Is Where THC and CBD Begin
The cannabis plant doesn't 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're holding finished flower, most of what started as CBGa has already converted. That's normal. A fully mature, harvest-ready cannabis plant typically shows CBGa residuals in the 0.5–1% range or lower.
Mango Cake's CBGa is consistently three to four times that — sitting in the 2.4–3.5% range 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's 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 noticeably higher than the THC number alone would suggest — and it means the full-spectrum extracts we make from this strain (the Mango Cake Live Resin 510 Cart and Mango Cake Cured Resin AIO) carry a cannabinoid profile that's genuinely different from most at market.
Our other strains run higher CBGa than average, too. Gluerangutan and Timewarp typically test in the 1–2% range — still above what you'll see in most cannabis on the shelf. It's 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 — the conversion to THCA and other cannabinoids doesn't 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 × 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 didn't print that number on the label back then; the regulations on label space didn't 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's held across every tested lot since.
Beyond genetics, Tyler has a theory about flowering time. Mango Cake is a genuinely slow finisher — it comes in weeks after Gluerangutan in the outdoor field, and it's 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. Most commercial cannabis strains have been selected, over generations, partly for speed — faster cycle time means more harvests per year, which matters at scale. Mango Cake was bred for expression, not speed.
Tyler's the first to say that's a hypothesis, not a conclusion. The flowering-time connection makes intuitive sense, but we don't have the controlled trial to prove it.
We also grow in living soil — a continuously cultivated, biology-rich growing medium — and that soil does things to plant chemistry we notice but can't always fully explain. Our first three strains all showed nerolidol as a top-three terpene in 2019, which none of us had seen before. We attribute it to something in the soil biology at that point in the farm's development. Whether the living soil plays any role in how CBGa converts, we genuinely don't know. It's possible. It's also possible it's entirely genetic.
What the Research Says — and Where We Stop
There's 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 won't do is summarise that research here in terms of what CBGa "does." Under Canada's Cannabis Act, licensed producers can't make health or therapeutic claims about cannabinoids — that applies equally to well-known ones like THC and lesser-known ones like CBGa. If you're trying to make informed decisions about what you consume, that's 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. The retailers and budtenders, being curious about what was actually in the product and asking questions, 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's a more complete picture of what's in the jar than THC alone.
About Mango Cake
Mango Cake started as a cross Tyler made before GOOD BUDS was even licensed — Mango Taffie (an original GOOD BUDS strain: LA Affie × Hawaiian) crossed with Wedding Cake. It's been our highest-potency indoor strain since we first had it tested, and the CBGa numbers have been consistent from the beginning.
Tested at 29.9–32.1% total THC across lots. CBGa: 2.4–3.5%. Indoor flower runs terpinolene-forward; outdoor-influenced lots shift toward caryophyllene — two distinct expressions from the same genetics, both high quality. We grow the indoor flower for flower and pre-roll; the outdoor Mango Cake goes only to extract inputs.
FVOPA Certified Organic. Salt Spring Island, BC. Available through licensed retailers in BC and Alberta.
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 AmSpec COA data, Mango Cake lots MWC65–MWC72, OD25 TB1. Tested 2025–2026. Internal reference.
FAQs
What is CBGa in cannabis?
CBGa (cannabigerolic acid) is the first cannabinoid the cannabis plant produces. As the plant matures, CBGa is converted into THCA, CBDA, and other acidic cannabinoids via enzymatic reactions. Most finished cannabis flower shows low residual CBGa — 0.5–1% or less. Some cultivars, including Mango Cake, retain significantly more.
What's a normal CBGa percentage in finished cannabis flower?
Most cannabis in the market tests below 1% CBGa. Consistent readings above 2% are uncommon. Mango Cake sits at 2.4–3.5% across tested lots, which puts it in a different category from most strains you'll find on a BC or Alberta shelf.
What's the difference between CBG and CBGa?
CBGa is the acidic form — what's in the plant before any heat is applied. CBG is what CBGa converts to through decarboxylation, which happens with heat. When you're reading a COA for a cured flower before it's been consumed, CBGa is the relevant figure. After smoking or vaping, you're interacting with CBG.
Why does Mango Cake have such high CBGa?
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, which affects plant chemistry in ways we've documented but don't fully understand.
Does CBGa show up on a drug test?
Standard drug screening tests for THC metabolites. CBGa and CBG are not typically included in those panels. If drug testing is a real concern for your situation, check with the relevant authority rather than relying on this as guidance.
Can licensed cannabis producers make claims about what CBGa does?
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, and what the COA shows. What it does in the body is a question for the published research and your healthcare practitioner.
