Delta-8 THC is a psychoactive compound found naturally in cannabis, but in very small amounts. The delta-8 products sold in stores and online are almost entirely manufactured by chemically converting hemp-derived CBD into delta-8 THC in a lab. That conversion process, along with the lack of federal manufacturing oversight, means delta-8 products often contain much more than just the cannabinoid on the label.
The Molecule Itself
Delta-8 THC is structurally almost identical to the delta-9 THC that most people think of as “regular” marijuana. Both molecules have a chain of carbon atoms with a double bond, but the placement of that bond differs by one position: delta-8 has it on the eighth carbon, delta-9 on the ninth. That single-carbon shift changes how the molecule interacts with cannabinoid receptors in your brain, making delta-8 noticeably less potent than delta-9.
Users typically report relaxation, mild euphoria, and pain relief, with less anxiety and paranoia than they experience from conventional THC. It is still psychoactive, though. It will get you high, just to a lesser degree.
How Delta-8 Is Made
Cannabis plants produce very little delta-8 naturally, nowhere near enough for commercial products. Instead, manufacturers start with CBD extracted from legal hemp and use acid catalysts to rearrange its molecular structure into delta-8 THC. Common catalysts include strong acids like hydrochloric acid, sulfuric acid, and industrial compounds like boron trifluoride. These reactions typically take place in organic solvents such as toluene, ethanol, or methylene chloride.
This is an important point: despite being marketed as a “natural” hemp product, delta-8 is the result of industrial chemistry. The CBD starting material comes from a plant, but the final product is synthesized. The DEA has maintained that “all synthetically derived THCs remain schedule I controlled substances,” though the legal picture remains murky because the 2018 Farm Bill defined legal hemp as cannabis with less than 0.3% delta-9 THC, and delta-8 technically isn’t delta-9.
What Else Ends Up in the Product
The conversion from CBD to delta-8 is not a clean process. It generates reaction byproducts, and without strict manufacturing controls, many of these end up in the final product. A study published in Chemical Research in Toxicology analyzed 27 delta-8 vaporizer products and found a wide range of unlabeled substances.
Olivetol, a chemical precursor that forms during synthesis, appeared in 22 of the 27 products tested. Several products contained medium chain triglyceride oil (a common carrier oil) at concentrations up to 5.6%, despite it not being listed on the label. Others contained triethyl citrate, a plasticizer sometimes used as a flavor ingredient, at levels as high as 11%. None of these additives were disclosed to consumers.
The study also identified byproducts that act as chemical fingerprints of the manufacturing process. One product contained a compound that only forms when hydrochloric acid is used as a catalyst, and two others contained a byproduct specific to CBD conversion in ethanol. These aren’t ingredients anyone intended to include. They’re leftovers from the chemistry that weren’t cleaned up afterward.
Heavy Metals
The same analysis found measurable levels of heavy metals across the products tested, including lead, mercury, chromium, nickel, and copper. Mercury averaged 160 parts per billion. Lead averaged 42 parts per billion. Zinc was present at much higher concentrations, averaging 1.8 parts per million. These metals can come from the catalysts used in synthesis, the hardware of vaporizer cartridges, or low-quality source material.
The Testing Gap
Because delta-8 products exist in a regulatory gray zone, there is no federal agency requiring safety testing before they reach shelves. Some manufacturers voluntarily provide a Certificate of Analysis (COA) from a third-party lab, which ideally covers cannabinoid potency, residual solvents, pesticides, heavy metals, mold, yeast, and bacterial contamination like salmonella. A good COA will list the testing lab, the date, and a batch number matching the product you’re buying.
The problem is that COAs are voluntary, and not all labs test for the same things. A COA might confirm the delta-8 potency while completely ignoring the reaction byproducts and unlabeled additives described above. If a product has no COA at all, or if the COA only covers cannabinoid content, there’s no way to know what else you’re inhaling or ingesting.
Reported Side Effects
Between December 2020 and February 2022, the FDA received 104 adverse event reports from people who consumed delta-8 products. Reported symptoms included hallucinations, vomiting, tremor, anxiety, dizziness, confusion, and loss of consciousness. During roughly the same period, national poison control centers logged 2,362 exposure cases involving delta-8.
It’s unclear how many of these cases stem from delta-8 THC itself versus the contaminants and unlabeled ingredients in poorly manufactured products. That ambiguity is part of the problem: without consistent manufacturing standards, it’s difficult to separate the effects of the cannabinoid from the effects of everything else in the bottle or cartridge.
Delta-8 and Drug Tests
Standard drug tests don’t look for THC directly. They detect metabolites, the smaller molecules your body produces when it breaks down THC. Because delta-8 and delta-9 are so chemically similar, your body processes them into closely related metabolites. A standard urine test for cannabis will typically flag positive after delta-8 use, and most testing panels cannot distinguish between the two. If you’re subject to drug screening for work or any other reason, delta-8 will likely trigger a positive result.
Legal Status
The 2018 Farm Bill removed hemp from the Controlled Substances Act, defining legal hemp as cannabis containing less than 0.3% delta-9 THC by dry weight. Delta-8 products derived from hemp technically fall outside the federal marijuana prohibition, which is how they entered the market in the first place. However, the DEA’s position that synthetically derived THCs remain Schedule I creates a legal tension that has not been fully resolved in federal courts.
At the state level, many states have passed or are actively debating laws that restrict or ban delta-8 sales. The legal landscape shifts frequently, so what’s available in one state may be prohibited in a neighboring one. Checking your state’s current regulations is the only reliable way to know whether delta-8 is legal where you live.