I roast coffee for a living, and in 2019 I shipped what I'm pretty sure was the first commercial CBG-infused coffee in the country. People kept asking me the same questions. What is CBG, exactly. Will it get me high. How is it different from CBD. Why does it cost more. What do you mean by "calm focus."

This guide is the long answer. I'll cover the chemistry, the small but growing research base, what CBG coffee actually tastes like, and how to start without wasting money. I'll cite the studies (real ones, with PubMed links) and tell you straight when something is folklore rather than science.

A note before we go further: I sell CBG coffee. I have a clear bias. I'll work hard to keep this guide honest, including the parts where the research is thinner than the marketing.

What is CBG coffee?

CBG, short for cannabigerol, is one of more than 100 cannabinoids identified in the cannabis plant. It is sometimes called the "mother cannabinoid" because the acid form, CBGA, is the chemical precursor that the plant converts into THCA, CBDA, and CBCA as it matures. Most of the CBGA gets used up during the plant's life cycle, which is why CBG appears in trace amounts (often less than 1 percent) in mature hemp (Wikipedia entry on cannabigerol).

A CBG coffee infuses the brewed cup with measurable CBG. At Buddha Beans we infuse the green beans before roasting (a process we call ZenFusion), so the cannabinoids are bonded to the bean matrix rather than added as a topical oil after the fact. Different roasters use different methods. The end result is a coffee that brews and tastes like coffee, with cannabinoids dissolved into the cup.

Most CBG coffees on the market today pair CBG with CBD, because the two compounds are well-studied together and a small extra bit of CBD smooths out the cup's bitterness. Buddha Beans' CBG coffees follow that pattern: 6.25mg CBG plus 6.25mg CBD per 8oz cup in the standard line, and 12.5mg of each in the Black Label.

How CBG differs from CBD

The deeper version requires a quick pharmacology detour. Cannabinoids work by interacting with receptors in your nervous system, mainly through the endocannabinoid system (ECS). Different cannabinoids prefer different receptors.

CBD's main targets, based on the published mechanism literature:

• Weak agonist at 5-HT1A serotonin receptors (linked to its anxiolytic effects)
• TRPV1 vanilloid receptors at higher concentrations
• Indirect modulation of CB1 and CB2

CBG's profile, based on a comprehensive 2022 pharmacology review (Calapai et al., 2022, PMC9666035):

• Potent α2-adrenoceptor agonist (EC50 = 0.2 nM, the strongest binding affinity in CBG's profile)
• Modest 5-HT1A antagonist
• Weak CB1 and CB2 binder
• TRPV1, TRPA1, and TRPV2 agonist; TRPM8 antagonist
• Inhibits anandamide reuptake (anandamide is one of your body's natural cannabinoids)

Translation for non-pharmacologists: CBG hits a different set of receptor targets than CBD. The α2-adrenoceptor binding is interesting because that receptor system is connected to alertness and attention regulation. CBG also doesn't bind tightly to CB1 or CB2, which are the receptors most associated with the THC "high." That is one mechanistic reason CBG, like CBD, is non-intoxicating.

The taste difference is real too. CBG isolate has a slightly more bitter, herbal note than CBD isolate. In a coffee, this means a CBG cup pairs better with darker roasts and origins that already carry chocolate or caramel notes. The Colombia we use as the base for both Buddha Beans CBG products was selected for that reason: it has a heavy body and natural sweetness that absorbs the herbal note rather than fighting it.

How CBG coffee is made

Three production methods are common in the U.S. specialty market today:

1. Spray-on (post-roast): A measured CBG extract is sprayed onto roasted beans and tumbled until evenly coated. The cheapest method. The extract sits on the surface, which can cause uneven dosing and a slightly oily mouthfeel.
2. Pre-roast infusion (the Buddha Beans approach, called ZenFusion): The green coffee beans are infused with the cannabinoid extract under controlled conditions before roasting. The cannabinoids penetrate into the bean. The bean is then roasted normally. This protects the cannabinoids inside the cellular structure during brewing and produces a more consistent cup-to-cup dose.
3. Capsules and pods: A pre-measured cannabinoid powder or extract is added to a coffee capsule (like a K-Cup) at the production stage.

Once the bean is in your grinder, you brew CBG coffee the same way you brew any other coffee. Pour-over, French press, espresso, drip, AeroPress, all fine. A few practical notes:

• Brewing temperature. The standard 195 to 205°F is fine. Cannabinoids are reasonably heat-stable in the bean matrix at brewing temperatures and times. Long-duration high heat (think a pot sitting on a hot plate for hours) is the worst case.
• Filter type. Some roasters claim paper filters absorb a small amount of cannabinoid. Metal mesh and French press leave more in the cup. The published evidence here is thin, but it's a reasonable bet if you're optimizing for dose.
• Add fat. This one matters. CBG, like CBD, is fat-soluble. A 2025 pharmacokinetic study published in Scientific Reports found that consuming CBD with a high-fat meal increased peak blood concentration roughly 17 times versus a fasted state (Patrician et al., 2025, Scientific Reports). That's a measured effect on absorption, not a marketing claim. Whole milk, oat milk, cream, MCT oil, or coconut oil in your cup is a reasonable way to get more of what's in the bag into your bloodstream.

What the research says about CBG

The CBG evidence base is a fraction of the size of the CBD literature. Worth knowing what we have, and what we don't.

The first published human CBG trial

Cuttler, Stueber, Cooper et al. published the first double-blind, placebo-controlled human trial of CBG in Scientific Reports in 2024 (doi: 10.1038/s41598-024-66879-0; WSU news release). The design:

• 34 healthy adults, double-blind crossover
• Single 20mg oral dose of hemp-derived CBG vs placebo
• Outcomes measured at 20, 45, and 60 minutes post-dose

The findings:

1. About 26.5 percent reduction in subjective anxiety vs placebo across all three time points
2. Reduced subjective stress at the first measurement
3. Improved verbal memory: participants on CBG recalled more words than on placebo
4. No reported intoxication, sedation, dry mouth, or appetite change

Why this study matters for CBG coffee specifically: 20mg is in the same order of magnitude as the dose in two cups of Buddha Beans Black Label CBG (12.5mg per cup). One cup of Black Label gets you to about 60 percent of the trial dose. Two cups exceeds it. That's a real, citable piece of human research at a dose a customer would actually consume.

One study is one study. The trial was small. The effect was acute, not chronic. More research is needed before anyone can responsibly say CBG "treats" anything. But the result is interesting enough that two follow-up trials are now registered: NCT05088018 (25 to 50mg daily for sleep and quality of life in veterans) and NCT06115603 (80mg daily for ADHD symptoms) (Frontiers in Pharmacology 2025 review).

Preclinical work on CBG

The animal and in-vitro literature is larger. A 2023 study in Frontiers in Pharmacology found that CBG modulates serotonergic firing in the dorsal raphe nucleus and noradrenergic firing in the locus coeruleus of rat brain slices, and produced anxiolytic-like behavior in elevated-plus-maze and novelty-suppressed feeding tests (Frontiers in Pharmacology 2023). A separate preclinical study showed CBG increased food intake in pre-satiated rats (Brierley et al., PMC5021742).

Animal data does not translate directly to humans, but it is the reason CBG was a research candidate in the first place.

What is folklore (so far)

User-survey reports describe CBG as helpful for "concentration and productivity." This is plausible given the α2-adrenoceptor mechanism, but it has not been confirmed in a published clinical trial. Treat the focus and productivity claims as customer experience, not science, until the registered trials report out.

What CBG coffee tastes like

Buddha Beans uses a Colombia single-origin as the base for both CBG products because the cup profile matches well: medium-heavy body, chocolate and caramel notes, light citrus brightness. The cannabinoid extract sits in the finish rather than fighting the front of the cup.

For comparison: Ethiopian naturals and bright Kenyans tend to clash with hemp extract. The fruit and floral notes that make those origins exciting also amplify any herbal undertone. We've tried it. It doesn't work.

If you're new to infused coffee, drink your first cup black and notice what shows up in the finish. Then add your usual cream or milk and notice what changes. Most people find the herbal note disappears under dairy fat, and the cup just tastes like a smooth, slightly fuller version of regular coffee.

How to start with CBG coffee

Here is the protocol I give friends:

1. Day 1 to 3: One cup of standard CBG coffee (around 6mg CBG plus 6mg CBD), with your normal cream or milk. Take it in the morning when you'd normally have coffee. Notice how the caffeine ride feels different (or doesn't).
2. Day 4 to 7: Continue at one cup. By day five or six, most people who notice a difference at all have noticed it. If nothing has changed, you have a few options.
3. If you want a stronger cup: Move to Black Label CBG (12.5mg of each compound per cup). Don't double up on standard cups, you'll get more caffeine than you want.
4. If you want a longer session: Brew a second cup of standard later in the day. The half-life of CBG in humans is not well-characterized, but the Cuttler trial measured effects at 60 minutes post-dose.

Two practical notes from years of customer feedback:

• Cannabinoid response is highly individual. Some people feel something on cup one. Others need a week of daily use to notice anything. A small fraction don't notice any subjective effect at all. The endocannabinoid system varies significantly between individuals.
• Pair the cup with food and fat. As covered above, this is not a marketing line. Dietary fat measurably increases cannabinoid absorption.

I tell everyone the same thing: don't chase a feeling. Drink it for a week, judge it on the third cup, not the first.

Buddha Beans CBG products

We currently sell two CBG coffees, both built on the same Colombia single-origin base.

Both products use broad-spectrum extract (THC removed) verified by third-party COA on every batch. The base coffee is SCA-graded specialty (80+ score), direct-trade from a Huila microlot. The roast profile is built specifically to carry the cannabinoid extract without amplifying the herbal note.

Frequently asked questions about CBG coffee