CBD, short for cannabidiol, is a compound from the cannabis plant that doesn't make you feel high the way THC does. When people compare types of CBD, they usually mean three kinds of extract. Full spectrum keeps many of the plant's compounds, including a little THC. Broad spectrum aims to remove the THC, and isolate is nearly pure CBD. Here's how to tell them apart and read a label before you choose.
What is cannabidiol, and how does it differ from THC?
CBD and THC are both cannabinoids, natural compounds the cannabis plant makes. They come from the same plant, but they act differently in your body. THC is the compound behind a cannabis high. CBD is non-intoxicating, which means it doesn't produce that high.
Non-intoxicating isn't the same as no effects. The FDA lists sleepiness, stomach upset, mood changes and possible liver injury among its concerns, and CBD can change how other medicines work. Our guide to the differences between CBD and THC compares the two.
How CBD works with the endocannabinoid system
Your body runs its own cannabinoid signaling network, the endocannabinoid system. It includes cannabinoid receptors, mainly CB1 and CB2, signaling molecules your body makes, such as anandamide, and the enzymes that break those molecules down.
THC works directly: it binds to cannabinoid receptors and partly switches them on. CBD's role looks more indirect. Lab research suggests it can turn down how the CB1 receptor responds and slow FAAH, the enzyme that breaks down anandamide, so more of that signal stays around. CBD also acts on several targets outside this system.
Much of that evidence comes from lab and animal studies, so what it means for a person taking a gummy is still being worked out.
The three types of CBD extract
Three labels show up again and again on CBD packaging. A product-testing study published in 2024 used these working definitions:
| Type | What it keeps | THC |
|---|---|---|
| Full spectrum | CBD, other cannabinoids and other natural plant compounds, with nothing added or fully stripped out | Trace amounts; that definition caps THC at 0.3% |
| Broad spectrum | CBD and other cannabinoids | Processed to remove THC to levels a lab can't detect |
| Isolate | More than 95% CBD | None intended |
Put full spectrum vs broad spectrum CBD side by side, and the practical difference is THC: one keeps a little by design, and the other aims for none. Our guide to full-spectrum CBD looks at that first category in more detail.
These names help, but they aren't always accurate. That study tested 202 CBD products bought online in late 2021. Of the 149 that named a type on the package, roughly a third didn't meet that type's definition. Three products sold as broad spectrum contained THC, and two of those were above 0.3%. Be wary of any promise of zero THC.
CBD product formats compared
The format changes how fast CBD reaches your bloodstream and how easy each serving is to measure. If you're weighing CBD oil vs gummies, for example, drops let you adjust in small steps, while a gummy holds a set amount in every piece.
| Format | How you use it | Timing | Good to know |
|---|---|---|---|
| Gummies and other edibles | Chewed and swallowed | Slower, since digestion comes first | Each piece holds a set amount |
| Tinctures and oils | Drops under the tongue or swallowed | Varies; what you swallow acts like an edible | A marked dropper allows small changes |
| Vapes | Inhaled | Fastest to peak in studies | Harder to measure exactly |
| Creams and balms | Rubbed into the skin | Depends on the product | Made for the area where you apply them |
A 2018 review of CBD studies in people found that blood levels peaked within about four hours of a dose, and fastest when CBD was inhaled. Taking it with food, or in an oil-based formula, raised peak blood levels. For drops and creams, see our cannabis tincture guide and our guide to cannabis topicals.
Starting amounts: begin small and adjust slowly
How much CBD to take has no single answer. Many labels list the milligrams in each serving and in the whole package, which makes products easier to compare. A cautious approach:
- Pick one product and stay with it for a while, so you know what's causing what.
- Start with the smallest serving on the label, or less.
- Give it time, especially with edibles, before you take more.
- Keep short notes on the amount, the time and how you felt.
- Adjust in small steps, and only one thing per session.
If you take any medicines, ask your pharmacist or doctor before you start, since CBD can affect how other drugs work. Our CBD dosage guide covers serving sizes in more depth.
How to choose a type of CBD
If THC doesn't agree with you
Isolate carries the least THC, followed by broad spectrum. Because testing has found THC in products sold as broad spectrum, check the THC figure on the label rather than the wording on the package.
If you're drug tested
Standard drug tests look for a breakdown product of THC, not CBD. That makes THC content the number to watch. Full spectrum contains THC by design, so it's the riskiest choice if you're tested, and product testing has found THC even in items sold as broad spectrum. Our guide to CBD and drug tests, in the related reading below, covers the research.
The entourage idea
Some people pick full spectrum because of a theory called the entourage effect, which holds that the plant's compounds do more as a team than CBD does alone. A 2023 scientific review called the research on it still in its infancy, with simple study designs, contradictory results and clinical evidence that leans on anecdotes. If you like how a full-spectrum product feels for you, that's a fair reason to choose it. Just don't take the theory as settled science.
Reading CBD labels and lab results
Every licensed cannabis product sold in Michigan, including CBD-rich ones, carries a label with its THC and CBD content. The label also notes that actual values may vary by 10% and lists the testing lab, the test date and an activation time. On a CBD product, look for:
- Milligrams of CBD per serving and per package. Percentages alone make comparisons hard.
- The THC figure. Even CBD-focused products may hold some THC, and some combine the two on purpose.
- The serving size. One gummy, one full dropper or a line on the dropper.
- The testing lab and test date. They show the product went through testing.
Plenty of CBD is also sold outside dispensaries, and the FDA has found that many such products didn't contain the amount of CBD they claimed. If a product comes with a lab report, check that its batch number matches your package and that it lists THC too. Our budtenders are happy to walk you through any label; find your nearest store on our locations page.
What research suggests about CBD, and its limits
Many CBD claims run ahead of the evidence. Here's where things stand:
- One approved medicine. As of October 2026, the FDA's cannabis regulation page, last updated in July 2024, lists one approved CBD drug: a purified prescription medicine for seizures linked to Lennox-Gastaut syndrome, Dravet syndrome or tuberous sclerosis complex. Its first approval, in 2018, covered the first two, and the page says no other FDA-approved drug contains CBD.
- Unreviewed products. Other CBD products haven't gone through the FDA's review of whether they work for any condition.
- Real side effects. The FDA's list includes liver injury, interactions with other medicines, sleepiness, stomach upset and mood changes. Combining CBD with alcohol or other sedating drugs raises the risk of drowsiness.
- Open questions. The effects of CBD during pregnancy and breastfeeding are among the questions the FDA says are still unanswered.
Talk with your doctor before using CBD if you're pregnant or breastfeeding, take other medicines or have a liver condition. The FDA's advice is that any CBD use should be discussed with a health care provider. Shopping at a licensed Michigan dispensary is for adults 21 and older, or medical patients 18 and older with a card. Use cannabis responsibly.
