Answer
Broad spectrum CBD is a hemp extract with more than one cannabinoid. It contains CBD plus other cannabinoids such as CBG, CBC, and CBN, and it carries terpenes. THC is removed or reduced to trace amounts. The label has no legal definition. No US rule sets a THC limit for broad spectrum beyond the 0.3% hemp cap. Two products with the same label can differ.
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How it differs from full spectrum and isolate
CBD isolate is one molecule. Lab tests show CBD and little else. Full spectrum keeps the full hemp profile, including up to 0.3% delta-9 THC on a dry weight basis. Broad spectrum sits between the two. Makers remove THC, then add back other compounds or keep them through extraction. The step order changes the final mix.
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What the THC number means
Federal law caps hemp at 0.3% delta-9 THC by dry weight. That cap applies to the plant and to hemp-derived products under the 2018 Farm Bill. A broad spectrum label claims THC is lower than full spectrum. It does not prove zero THC. A product can hold trace THC and still pass a 0.3% test. Drug tests screen for THC metabolites. Trace THC can add up with daily use at high doses. No label value replaces a batch lab report.
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Read the certificate of analysis
A certificate of analysis (COA) comes from a third-party lab. It lists cannabinoid content by batch. Check four fields: total CBD in mg per container, delta-9 THC result, the lab name, and the batch date. Check the cannabinoid panel, not just a pass or fail mark. A COA from a lab with no name or no batch number gives no useful data.
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What research supports
FDA has approved one CBD drug, Epidiolex, for rare seizure disorders. FDA has not approved CBD for other uses. Research on broad spectrum CBD as a category is thin. Most trials use purified CBD, not broad spectrum extract. That limits claims about added benefit from other cannabinoids.
Safety and dose
CBD can raise liver enzymes and interact with drugs. Drugs with a grapefruit warning are a known risk group. Side effects in trials include drowsiness, diarrhea, and changes in appetite. Dose ranges in trials differ from retail labels. Talk to a clinician before use, with liver disease or prescription drugs.