Yes — CBD is legal in the US. Hemp-derived CBD that contains less than 0.3% THC is federally legal in all 50 states, no prescription or license required. That's the rule the 2018 Farm Bill set at the federal level, and pure CBD isolate — which is 0% THC by definition — sits squarely on the legal side of that line.
The 2018 Farm Bill in plain English
The Farm Bill removed hemp — cannabis with less than 0.3% THC by dry weight — from the federal list of controlled substances and legalized its cultivation and sale. CBD extracted from legal hemp is therefore a legal, agricultural product. No prescription, no special license, no federal restriction on buying it.
Do you need a prescription?
No. Hemp-derived CBD is available over the counter as a dietary supplement. A prescription only applies to FDA-approved pharmaceutical CBD, which is a completely separate product from the isolate tinctures most people buy. For daily wellness use, no prescription is involved.
State-by-state reality
| Situation | Status |
|---|---|
| Hemp CBD under 0.3% THC (federal) | Legal in all 50 states |
| Hemp CBD under 0.3% THC (most states) | Legal with normal retail rules |
| Marijuana-derived CBD (high THC) | Legal only where recreational/medical cannabis is |
| CBD with 0% THC (isolate) | Legal; lowest regulatory complexity |
Why 0% THC isolate simplifies everything
The moment THC reaches higher levels, you move from "hemp product" to "cannabis product," which triggers state cannabis law. By using pure isolate at 0% THC, you avoid that entire category. It's the cleanest, simplest legal situation a CBD product can be in.