Full-spectrum vs broad-spectrum vs isolate

The three words on a CBD label describe one thing: what the processor did with THC after extraction. Full-spectrum keeps it. Broad-spectrum removes it. Isolate strips everything but CBD. That one decision drives drug-test exposure, flavor, which states will accept the package, and, from December 11, 2026, whether the product is still federally hemp at all.

What does each term actually mean?

Full-spectrum extract is the raw hemp oil after solvent or CO2 extraction, winterization and sometimes distillation. It carries CBD plus the minor cannabinoids (CBG, CBN, CBC), the acidic forms (CBDa, CBGa, THCa), terpenes and flavonoids, and delta-9 THC at up to 0.3% by dry weight, the current federal hemp line in 7 U.S.C. 1639o.

Broad-spectrum starts as full-spectrum and then goes through a THC-removal step, usually preparative chromatography or a remediation column. The goal is a non-detect THC result while keeping the other cannabinoids. "THC-free" on a broad-spectrum label is a lab statement, not a chemistry statement: it means THC was below the limit of quantitation (LOQ) of the method used.

Isolate is CBD crystallized out of distillate to 99%+ purity. It is a white powder with no terpenes, no minors and no THC. Formulators dissolve it into a carrier oil, a gummy base or a capsule.

How much THC is in each, in milligrams?

Percentages hide the number that matters. A full-spectrum tincture in the current Go North catalog lists 1.5 mg THC per full dropper on a 2,000 mg bottle with 30 to 60 servings, which works out to 45 to 90 mg of THC in the bottle (Slumber catalog). A sleep gummy in the same catalog lists 3 mg THC per piece, 90 mg per 30-count jar. Those are compliant today because the 0.3% test is applied to the plant and extract by weight, not to the finished container.

Broad-spectrum and isolate labels say "ND" or "THC-free". The honest reading is "below the LOQ". Standard potency methods report ND at LOQs between 0.01% and 0.05%. At 0.01%, a 30 g container could still hold up to 3 mg of THC without the lab flagging it. That arithmetic is why the COA's LOQ line matters more than the word "free".

What changes on December 11, 2026?

Section 781 of Public Law 119-37 rewrote the hemp definition: total tetrahydrocannabinols "including tetrahydrocannabinolic acid" at not more than 0.3% for the plant, and for final products "not more than 0.4 milligrams combined total per container" (Cornell LII amendment notes). The original effective date was 365 days after the November 12, 2025 enactment. On September 2, 2026, Public Law 119-103 (Sec. 2019) narrowed what takes effect on that first date: "Until December 11, 2026," the amendments apply "only" to products described in paragraphs (1)(C)(ii)(I) and (1)(C)(iv)(I), the clauses covering cannabinoids "not capable of being naturally produced by a Cannabis sativa L. plant" (GovInfo).

So the sequence is: November 12, 2026, the non-natural cannabinoid exclusion lands. December 11, 2026, the total-THC standard, the 0.4 mg per-container cap and the exclusion for cannabinoids "synthesized or manufactured outside the plant" all land, absent new legislation.

Against a 0.4 mg cap, a full-spectrum bottle carrying 45 mg of THC is over 100 times the limit. No reformulation gets a true full-spectrum oil under that line at a 1,000 mg or higher strength. Broad-spectrum and isolate can clear it, but only with a COA that reports total THC (delta-9 plus 0.877 times THCa) in milligrams per innermost container, or an LOQ low enough that "ND" is itself proof. For a 30 mL bottle, that is roughly a 10 ppm LOQ.

Which one shows up on a drug test?

Workplace urine screens under the federal Mandatory Guidelines use an initial cutoff of 50 ng/mL for the THC metabolite (THCA, the carboxylic acid metabolite, not the plant acid) and a confirmatory cutoff of 15 ng/mL (Federal Register, Jan. 23, 2017).

Full-spectrum products can cross those lines. In a 2017 analysis of 84 CBD extracts bought online, "THC was detected (up to 6.43 mg/mL) in 18 of the 84 samples tested", and only 30.95% of products were labeled within 10% of their measured CBD (Bonn-Miller et al., JAMA 2017). In a controlled dosing study, vaporized CBD-dominant cannabis containing 100 mg CBD and 3.7 mg THC produced two urine samples that screened positive at the 50 ng/mL cutoff, while purified CBD (oral and vaporized) produced one positive out of 218 specimens, and that was at a stricter 20 ng/mL cutoff (Spindle et al., 2020).

The practical ranking: isolate is the safest if you are tested, broad-spectrum with a low-LOQ COA is close behind, and full-spectrum is a known exposure.

How does flavor differ?

Full-spectrum oil tastes like the plant: bitter, grassy, resinous. Terpenes and chlorophyll carryover do that, and strong flavoring only partly covers it. Broad-spectrum is softer because the remediation step strips some terpenes along with the THC. Isolate has no taste of its own, which is why flavored tinctures and most gummies are built on it.

Which states block which format?

Two large states draw the line at "detectable". Washington's E2SSB 5367, effective July 23, 2023, defines a hemp consumable as a product "that contains no detectable THC" and counts "all forms of THC" when measuring, which leaves full-spectrum ingestibles to licensed cannabis retailers only (Washington LCB fact sheet). California's emergency regulation, operative September 23, 2024, requires that "each serving in a package shall have no detectable amount of total THC" and caps packages at five servings (17 CCR 23100).

Broad-spectrum and isolate products can meet both standards, provided the COA shows ND for THC and THCa at the state's required method. Full-spectrum cannot.

What should the COA show for each?

For full-spectrum, look for a full cannabinoid panel that reports CBD, delta-9 THC, THCa, CBG, CBN and CBC, with total THC expressed in mg per container, the LOQ printed, and a batch number that matches the bottle. For broad-spectrum, the panel should show THC and THCa both ND, the LOQ at 0.01% or lower, and measurable amounts of at least one minor cannabinoid, otherwise it is isolate with a different name. For isolate, the signatures are purity at 99% or higher, plus residual solvents, heavy metals and pesticide screens, since the crystallization step concentrates whatever came with the biomass.

One federal note that applies to all three: FDA's posted position is that CBD "products are excluded from the dietary supplement definition" and may not be added to food (FDA CBD Q&A). The spectrum type does not change that.

Which one should you pick?

Pick full-spectrum if you want the whole plant profile, are not drug tested, and your state accepts trace THC. Be aware that this category has the shortest federal runway.

Pick broad-spectrum if you want CBG, CBN or CBC alongside CBD without THC, and you can get a COA with a low LOQ or mg-per-container reporting.

Pick isolate if you are drug tested, flavor-sensitive, or you want clean milligram math. Oral CBD reaches peak blood levels in 0 to 4 hours regardless of spectrum, and taking it with food raises absorption (Millar et al., 2018), so the format choice is about THC, taste and law, not about speed.