What Is THCP? Strength, NC Legality & the 2026 Hemp Dates

THCP, short for tetrahydrocannabiphorol, is a close chemical cousin of delta-9 THC with a longer tail: seven carbon atoms on its side chain instead of five. Italian researchers first identified it in a cannabis plant in 2019, and in their lab assay it bound the brain's CB1 cannabinoid receptor about 33 times more tightly than the published figure for delta-9 THC. That single number is the usual source of the "strongest cannabinoid" claims on THCP packages.

The number is real, but it measures something narrower than the packaging implies. It is a test-tube binding result, not a measurement of how strong THCP feels to a person, and no controlled human dosing study of THCP turned up in our search of the published literature. THCP also exists in the plant only in trace amounts, so as far as we can find, the THCP in a vape cartridge or gummy is made in a lab, and that fact decides where it lands under the new federal hemp definition.

This guide covers what THCP is, what the 2019 study actually measured, how commercial THCP is produced, who is using it, and where North Carolina and federal law put it today, from November 12, 2026, and from December 11, 2026. For the wider comparison of the better-known cannabinoids, see our delta-8 vs delta-9 vs THCA guide.

Update, October 29, 2026: The delay is law, and nothing since has changed it. The President signed H.R. 6500 on September 2, 2026, and it became Public Law 119-103, after the Senate passed it 90-6 on August 8 and the House agreed to the Senate's version 370-48 on September 1. Its Section 2019 splits the P.L. 119-37 hemp rewrite across two dates. On November 12, 2026, one narrow piece takes effect: intermediate and final products containing cannabinoids that a Cannabis sativa L. plant cannot naturally produce. Everything else waits until December 11, 2026 (Section 2019, enrolled text). That remainder is the part that reaches the shelf: the 0.3 percent total-THC test that counts THCa, the exclusion for cannabinoids the plant can make but that were synthesized outside it (which is where delta-8 made from CBD falls), and the 0.4mg total-THC-per-container cap that reaches nearly every gummy, tincture, and vape. December 11 is also the day the stopgap funding law runs out, so Congress could still move the date in its next funding bill; as of this update it has not. Our NC hemp bill tracker follows what happens next, and our December 11 report counts what the change reaches across Triangle shops.

What Is THCP?

THCP is a phytocannabinoid, meaning a cannabinoid the cannabis plant produces on its own. It has the same ring structure as delta-9 THC. The only difference is the alkyl side chain: delta-9 THC carries a five-carbon (pentyl) chain, and THCP carries a seven-carbon (heptyl) chain.

That small change matters because the side chain is the part of the molecule that reaches into the CB1 receptor. The 2019 paper that named THCP, by Cinzia Citti and colleagues at the University of Modena and Reggio Emilia and partner institutions, notes that chemists had long known that synthetic THC analogues with longer side chains bind far more strongly than THC itself. What nobody had reported before was a naturally occurring cannabinoid with a straight side chain longer than five carbons. The team found two in a single sample: THCP and its CBD counterpart, cannabidiphorol (CBDP).

They found them in FM2, a medical cannabis variety produced by the Italian military's pharmaceutical institute in Florence. FM2 carries THC and CBD in similar amounts, roughly 4 and 6 percent by the institute's official test, far above the hemp limit, so it is not a hemp variety. The researchers confirmed THCP's identity by building the same molecule from scratch in the lab and showing that the two samples matched.

The amount was tiny. Their semi-quantitative method measured about 29 micrograms of THCP per gram of the FM2 material, against 39 milligrams of THC per gram, a THC figure that lined up with the institute's own official value for the variety. Plotted on a scale that can show both, the gap looks like this:

Put another way, the plant made roughly one part THCP for every 1,300 parts THC. Our own arithmetic on those figures: recovering a single milligram of THCP would take roughly 34 grams of that variety, assuming perfect extraction, which no real process achieves. When the team isolated THCP from its plant extract for testing, it recovered only about 0.3 mg.

How Strong Is THCP? What the 2019 Study Measured

The short answer: in a test tube, THCP grips the CB1 receptor nearly as tightly as a potent synthetic cannabinoid used in research, and in mice it produced THC-like effects at lower injected doses than are usually used for THC. Neither result tells you how a THCP gummy will feel.

The study ran two kinds of tests. The first was a binding assay, which measures how readily a molecule attaches to human CB1 and CB2 receptors in a dish. Binding strength is reported as a K_i value, in nanomolar (nM), and a lower number means tighter binding. THCP came in at 1.2 nM at CB1 and 6.2 nM at CB2. The paper compares that with 0.9 nM for CP55940, a potent synthetic research compound run in the same test, and with a published 40 nM for delta-9 THC from earlier studies, and states that THCP "resulted 33-times more active" than delta-9 THC at CB1. The chart converts each published K_i into binding strength relative to delta-9 THC.

The second test was the cannabinoid tetrad in mice, a standard battery that checks four classic signs of CB1 activity: reduced movement, catalepsy (holding an unusual posture), a slower response to heat on a hot plate, and a drop in body temperature. THCP was injected into the abdominal cavity at 2.5, 5 and 10 mg/kg. At 2.5 mg/kg it markedly reduced movement, at 5 and 10 mg/kg it produced catalepsy and the hot-plate effect, and the drop in body temperature was statistically significant only at 10 mg/kg.

The authors concluded THCP "proved to be as active as" delta-9 THC "but at lower doses," and explained the comparison: the minimum THC dose normally used in this test is 10 mg/kg, while THCP was active at 5 mg/kg in three of the four tests. That is a comparison against the standard literature dose, not a side-by-side THC arm in the same experiment, so it gives no potency ratio. The most it shows is that THCP was active in three of four tests at half the usual THC test dose.

Why "33 Times Stronger" Is Not What the Study Showed

The 33-times figure is accurate for exactly one thing: how tightly THCP binds CB1 compared with THC in a binding assay. Packaging that says THCP is "33 times stronger than THC" is converting a receptor measurement into a promise about effects, and the study never made that promise.

Binding affinity tells you how readily a molecule attaches to a receptor at equilibrium. How strong a cannabinoid feels also depends on how much of a swallowed or inhaled dose reaches the bloodstream and the brain, how fast the liver breaks it down, what the breakdown products do, and how fully the molecule activates the receptor once attached. None of that was measured for THCP in people in the 2019 paper, and our search of Europe PMC on November 9, 2026 found no controlled human dosing trial since.

The metabolism question is starting to get answers. A 2026 study in the Journal of Analytical Toxicology incubated THCP and two other THC homologues with human liver microsomes, a lab model of liver metabolism. THCP was broken down into the same two kinds of products THC is: a hydroxylated one (with an added OH group) and a carboxylated one (an acid). The amounts differed. The seven-carbon chain reduced formation of the hydroxylated product compared with THC and sped its conversion to the acid. The authors framed the work as giving toxicology labs new targets for identifying THC analogues in intoxication cases. It does not establish a human potency multiple either.

How THCP Products Are Made

At 29 micrograms per gram of a medical variety with about 4 percent THC, extracting THCP from plants does not look like a commercial option, so as far as we can find, the THCP sold in vapes and gummies is produced by chemical synthesis; the 2026 forensic study discussed below describes the THCP it found in commercial products as synthetically derived. The 2019 team made its reference sample that way, joining a ring compound that already carries the seven-carbon chain to a terpene-type alcohol, in a multistep route that produced the delta-8 form of THCP first. Neither starting material is hemp.

That production route is the single most important fact about THCP for the law, and it is the part a label almost never discloses. A product sold as "hemp-derived THCP" may be a hemp extract or distillate with lab-made THCP blended in, which is why the 2025 survey and 2026 forensic study cited below group THCP with delta-8, delta-10 and HHC as semi-synthetic or synthetically derived cannabinoids.

Lab-made cannabinoid products can be mixtures. A 2026 Journal of Forensic Sciences study by Ciolino and Ranieri analyzed synthetically derived delta-9 and delta-8 products submitted for testing between 2019 and 2024, and reported that several combined THC isomers with THCPs or HHCs. It was a sample of products sent in for testing, not a survey of THCP products. Total THC isomer content in the gummies ranged from 57 to 321 mg per gummy, and the highest combined THC and HHC content was 791 mg in a single gummy. Those were not all THCP products, but they show what a lab-made cannabinoid gummy can contain, and why a label number is only as good as the test behind it.

Two practical consequences follow. First, a THCP product may not be only THCP, so its effects and its legal status depend on everything else in the blend. Second, synthesis can leave behind reaction byproducts and positional isomers that a basic potency panel does not look for, which is why the certificate of analysis section below matters more for THCP than for flower.

Who Is Using THCP

In one small online survey, THCP was the most-reported semi-synthetic cannabinoid. In that 2025 survey in Cannabis and Cannabinoid Research by Pabon, Lake, Murray and Cooper, 44.5 percent of 229 U.S. adults who had used cannabis in the past year reported using at least one semi-synthetic cannabinoid in that year. THCP came first, ahead of delta-8.

The sample is small and was recruited online, so the percentages describe that group, not all American cannabis users. Within it, younger respondents and heavier lifetime users were more likely to report semi-synthetic use, and the authors reported adverse effects across all of the semi-synthetic cannabinoids they asked about. Their conclusion was that the products' popularity has outrun the research and regulation needed to judge their safety, which is a fair one-line summary of THCP as a whole.

Is THCP Legal in North Carolina Today?

As of this writing, THCP products are sold openly in North Carolina, but in our reading their legal footing is weaker than that of delta-9 or THCA hemp products, and it rests on statutes that never mention THCP.

North Carolina's Controlled Substances Act lists "tetrahydrocannabinols" in Schedule VI, with an exception for "tetrahydrocannabinols found in a product with a delta-9 tetrahydrocannabinol concentration of not more than three-tenths of one percent (0.3%) on a dry weight basis" (G.S. 90-94(b)(2)). Chemically, THCP is a tetrahydrocannabinol (the "THC" in its name), so in our reading a THCP product under the delta-9 limit fits the plain words of that exception. That is the same reasoning that has kept delta-8 on North Carolina shelves, covered in our delta-8 legal guide.

The complication is a separate Schedule I entry for synthetic cannabinoids. G.S. 90-89(7) reaches "any synthetic chemical compound that (i) is a cannabinoid receptor agonist and mimics the pharmacological effect of naturally occurring substances or (ii) has a stimulant, depressant, or hallucinogenic effect on the central nervous system that is not listed as a controlled substance in Schedules I through V, and is not an FDA-approved drug." Lab-made THCP is a synthetic compound that acts on cannabinoid receptors. In our reading, the open question is whether the specific Schedule VI entry for tetrahydrocannabinols, with its delta-9 exception, controls over this general catch-all. We found no North Carolina appellate decision answering it. Treat this as a gray area, not a green light.

Federal law points both ways. The Congressional Research Service, in a legal sidebar dated October 28, 2026, describes the DEA's 2020 position that "all synthetically derived" THCs remain Schedule I, and the Fourth Circuit's 2024 decision in Anderson v. Diamondback Investment Group, which held that hemp includes all cannabinoids derived from cannabis under the delta-9 limit. The Fourth Circuit covers North Carolina. But even that ruling described synthetic cannabinoids as "compounds manufactured entirely out of synthetic materials," and THCP built from non-hemp starting chemicals may fit that description. In our reading, how a given THCP was made could decide which side of that line it falls on.

The four legal texts that bear on THCP's status in North Carolina, side by side:

North Carolina's own pending bill would settle the state question.

North Carolina status, October 29, 2026: HB 328, the state hemp crackdown, passed the Senate in July but still awaits a House vote, which can now come only in the reconvened sessions of November 16 to 19 or November 30 to December 18. Today North Carolina sets no minimum age for hemp products, though many shops card at 21. Details in our NC hemp bill tracker.

The HB 328 conference report rewrites the state definition of "hemp" to count "any other tetrahydrocannabinol" toward a total-THC limit and says hemp "does not include any synthetic or chemically converted cannabinoid." The bill would also add to Schedule VI any finished product meant to be eaten or inhaled that contains "any synthetic or chemically converted cannabinoid." In our reading, if it becomes law in that form, lab-made THCP would fall outside North Carolina hemp under a section written to take effect November 12, 2026, which in practice means on enactment if the House adopts it later.

Where THCP Lands Under the 2026 Federal Hemp Law

Federal law is where THCP's future is decided, and the answer depends on reading the new hemp definition clause by clause. Section 781 of P.L. 119-37 rewrites 7 U.S.C. 1639o, and its paragraph (1)(C)(iv) excludes from hemp any "final hemp-derived cannabinoid products" containing any of three things. Section 2019 of P.L. 119-103 then splits when those exclusions apply: until December 11, 2026, the amendments "shall only apply" to products described in (ii)(I) and (iv)(I).

The first row corrects a tempting mistake in the opposite direction from the 33-times claim: grouping THCP with THC-O as a "synthetic" cannabinoid that disappears on November 12. The statute's November 12 category turns on whether the plant can make the compound, not on how a given batch was made, and the 2019 study is peer-reviewed evidence that the plant can make THCP. So, in our reading of the statute's text, THCP is a December 11 cannabinoid.

There is one caveat on that reading. Section 781 also directs the FDA to publish, within 90 days of enactment, a list of all cannabinoids "known to FDA to be capable of being naturally produced" by the plant "as reflected in peer reviewed literature." According to the Congressional Research Service, FDA had "not published any of these items" as of October 28, 2026, and our search found none as of November 9, 2026. Until it appears, nobody can point to an official federal placement for THCP. A THCP blend can also be caught on November 12 by a different ingredient: a product that also contains a cannabinoid the plant cannot make falls under clause (I) whatever its THCP content.

November 12 or December 11? The THCP Timeline

Putting the clauses on a calendar gives a clear sequence for a typical lab-made THCP vape or gummy.

In our reading, December 11 is where THCP runs out of room. Even plant-extracted THCP would very likely exceed the 0.4 mg cap, depending on how THCP is counted under clause (III). The cap counts total THC plus cannabinoids with similar effects, combined, per container. For scale, the lowest gummy in the 2026 forensic study held 57 mg of THC isomers, more than 140 times the cap, and a product sold on the strength of its potency would make little sense at a fraction of a milligram per package.

December 11, 2026 is also the date the current stopgap funding law expires, so Congress could move it again in the next funding bill. If that happens, the dates in this section move with it; the clause analysis does not. Our hemp ban explainer covers the whole law, and the THCA ban guide shows the same clauses applied to flower.

THCP and Drug Tests

The honest answer is that we found no published study showing how THCP behaves on a standard workplace drug screen, so do not assume it is invisible to one.

Standard urine screens look for the main acid breakdown product of delta-9 THC. The 2026 liver study found that THCP also produces an acid breakdown product, but with a longer side chain, so it is a different molecule from the one a screen is built to catch. Whether the antibodies in a urine screening test react to it was not reported in that study. The closest data point is a 2022 Journal of Analytical Toxicology study of one THC blood immunoassay, which found THCP itself registered at just 0.5 percent cross-reactivity. A lab running mass spectrometry can look for THCP metabolites specifically, and the 2026 authors said their findings give labs new targets to do it.

The bigger practical risk may be the rest of the blend. In the 2026 forensic study's sample of delta-8 and delta-9 products, several also contained THCP or HHC, so a THCP product can carry other THC isomers too. Delta-9 THC produces exactly the metabolite standard screens are built to catch, whatever else a cartridge contains. If you are subject to testing, the THCP question is mostly beside the point. Our hemp and drug testing guide covers detection windows and what a positive result can and cannot show.

How to Read a THCP Certificate of Analysis

A certificate of analysis (COA) matters more for THCP than for almost any other hemp product, because the label claim is a lab-made ingredient whose identity and purity you cannot judge by eye.

Start with the lab itself. Look for an independent lab name and an accreditation reference on the COA, and be skeptical of one that reports only "total cannabinoids." Then read the units and the detection limits. A result of "ND" means not detected, below the lab's limit of detection, and a result reported as "<LOQ" means detected but below the level the lab can reliably measure. A good COA prints its limits next to each analyte. For THCP, a line that reads ND on a product sold as THCP is a red flag: either the lab could not measure it or the product does not contain what the label says. A useful THCP COA should let you answer five questions.

Our guide to reading a COA walks through the format line by line with examples.

Where THCP Shows Up in the Triangle

THCP is a niche product in our directory. Of the 93 shop listings we track across the Triangle, three, belonging to two Raleigh businesses, name THCP in their product descriptions. By comparison, every listing in the directory mentions THCA, and 42 mention delta-8.

That count reflects what shops tell customers on their listings and websites, not a shelf audit, and inventory changes quickly around the federal dates. Call ahead before making a trip for a specific product, and ask to see the COA for the batch on the shelf. The Raleigh city guide lists every Raleigh shop we track.

The Bottom Line

THCP is a real plant cannabinoid with a striking lab result: a CB1 binding constant of 1.2 nM against THC's 40, and THC-like effects in mice at lower injected doses. Everything past that, including the "33 times stronger" promise on the package, is extrapolation that no human study we found has tested. The plant makes it in trace amounts, so the product is almost certainly lab-made, and in our reading of Section 781 that is what ends it under federal law on December 11, 2026. Under North Carolina law it sits in a gray zone until HB 328 or a court settles it, between a broad synthetic-cannabinoid statute and a narrow delta-9 exception.

This article is educational information, not legal or medical advice. Federal and North Carolina hemp law are both moving on a short timeline, so check current status before buying, selling or traveling with any hemp product. To find a shop, browse the Triangle dispensary directory or the Raleigh city guide.