The pick: CBD isolate first
Start with CBD isolate if you have not used CBD before. Isolate is cannabidiol at 99% purity or higher. One gram of powder holds 1,000 mg of CBD. You can weigh 25 mg and know the dose. Full-spectrum oil carries other cannabinoids, terpenes, and up to 0.3% THC under US law, so two bottles with the same label can differ in effect. Isolate removes those variables.
The trade-off: the pain trials with the strongest signal used THC. A CBD-only product has less human data behind it.
What each product is
CBD isolate
CBD is extracted from hemp, then stripped of waxes, terpenes, and other cannabinoids. The result is a white crystalline powder, or the same powder dissolved in MCT oil. Purity runs 99% to 99.9%. THC content sits below the limit of detection in most third-party lab reports.
Where to Buy Pure CBD Isolate Online: A Comprehensive Buying Guide
CBD oil
"CBD oil" covers three products. Full-spectrum oil keeps cannabinoids, terpenes, and trace THC. Broad-spectrum oil keeps most cannabinoids and drops THC. Isolate-based oil is the powder in a carrier. Labels in the US show mg of CBD per bottle, not per drop.
What the evidence shows for pain
The FDA has approved one CBD medicine, Epidiolex, for two rare seizure disorders. It has not approved CBD for pain. A 2015 meta-analysis in JAMA found moderate-quality evidence for cannabinoids in chronic pain. Most of those trials used products with THC, such as nabiximols. CBD-alone pain trials are small and their results are mixed.
Dose, cost, and onset
- Isolate powder: about $15 to $50 per gram at US retail. That is $0.015 to $0.05 per mg of CBD.
- Full-spectrum oil: about $0.03 to $0.10 per mg of CBD.
- Oral CBD reaches peak blood levels in 1 to 2 hours. Bioavailability is 4% to 20%.
- Epidiolex trials used 10 to 20 mg per kg of body weight. Pain trials used 50 to 1,600 mg per day. No standard pain dose exists.
Drug test risk
Full-spectrum oil can trigger a positive urine screen for THC. Isolate carries less risk, not zero risk. Labs vary, and some isolate batches test above zero for THC.
Interactions
CBD blocks the CYP3A4 and CYP2C19 enzymes. That changes blood levels of warfarin, clobazam, and some statins. Check with a pharmacist before you add CBD to a prescription list.
Options, in order
- CBD isolate powder or isolate tincture. Best for dose control and a clean drug screen.
- Broad-spectrum oil. Adds cannabinoids, drops THC. Cost sits between the other two.
- Full-spectrum oil. Keeps the plant profile and up to 0.3% THC. Read the lab report for the THC number.
- CBD plus THC at 1:1. This form has the most trial data for pain. It is legal in some US states only.
Convenience as the deciding factor
Isolate wins on dosing math. Oil wins on use. A tincture dropper takes one step and needs no scale. That difference, not the chemistry, decides most purchases. If you will not weigh powder, buy a tincture with a marked dropper and a stated mg per mL.