Where you can get cannabis oil depends on the type you’re looking for. Hemp-derived CBD oil with less than 0.3% THC is widely available online and in retail stores across the United States without a prescription. Cannabis oil containing higher levels of THC requires a medical card or legal access through a state-licensed dispensary. Understanding which product you need, and where it’s legally sold, determines your next step.
CBD Oil vs. THC Oil: A Critical Distinction
Cannabis oil is a broad term that covers two very different products. The first is CBD oil, made from hemp plants bred to produce high levels of cannabidiol and very low levels of THC (the compound that gets you high). The second is THC oil, extracted from marijuana plants and containing concentrations of THC that can reach 75% or higher in some extracts.
Under the 2018 Farm Bill, hemp is defined as any part of the cannabis plant containing no more than 0.3% delta-9 THC on a dry-weight basis. Products meeting that threshold are no longer classified as controlled substances under federal law. Anything above 0.3% THC is legally marijuana and falls under state-by-state regulation. This single number, 0.3%, is the line that separates a product you can buy at a gas station from one that requires a medical card or residency in a legal state.
Where to Buy Hemp-Derived CBD Oil
CBD oil that stays within the 0.3% THC limit is sold through online retailers, health food stores, pharmacies, vape shops, and even some grocery chains. You don’t need a prescription or a medical card. It’s available in all 50 states, though some states have additional restrictions on the forms it can take. Georgia, for example, prohibits the retail sale of raw hemp flower but allows other hemp-derived products like oils and edibles.
The FDA does not regulate CBD as a dietary supplement or food additive. Because CBD is an active ingredient in an approved pharmaceutical drug, the agency considers it excluded from the dietary supplement category entirely. In practice, this means CBD products exist in a regulatory gray zone: they’re widely sold but not formally evaluated by the FDA for safety, dosage, or effectiveness. The burden of choosing a quality product falls largely on you.
Buying CBD Oil Online
Online shopping offers the widest selection, but it also carries the most risk of receiving a substandard product. A study examining CBD oils purchased from online retailers found that 25% of products lacked basic instructions for use, increasing the chance of incorrect dosing. Some web stores listed no physical address, only a phone number or email. Others featured poorly translated text that appeared to come from automated tools, a common sign of low-quality or fraudulent operations.
Health claims are another red flag. Over 60% of online CBD shops in the study displayed indirect health benefit claims on their websites, and one even promoted its product for COVID-19. Legitimate CBD companies are generally careful about health claims because the FDA actively monitors and warns companies that market CBD as a treatment for specific diseases.
How to Verify Product Quality
The single most important thing to look for when buying any cannabis oil is a certificate of analysis, commonly called a COA. This is a lab report from a third-party testing facility that confirms what’s actually in the bottle. In states with formal hemp programs, processors are required to have a COA conducted within the last 12 months and make it publicly available.
A proper COA covers several areas. The cannabinoid profile lists exact concentrations of CBD, THC, CBG, CBN, and other compounds, so you can confirm the product’s potency matches the label. Contaminant testing checks for microbial threats like E. coli and Salmonella, heavy metals such as lead and mercury, pesticide residues, and residual solvents like butane or ethanol left over from extraction. Each of these categories should show a clear “PASS” status. The report also screens for mycotoxins (harmful mold byproducts) and foreign materials like dirt or glass.
If a company can’t or won’t provide a COA, that’s reason enough to look elsewhere. Reputable brands typically post COAs on their website or include a QR code on the packaging that links directly to the lab results.
Where to Get THC Cannabis Oil
Cannabis oil with THC above 0.3% is only legally available in states that have legalized marijuana for medical or recreational use. The source is always a state-licensed dispensary, not a retail store, online shop, or unlicensed dealer. In states like Georgia, it’s actually illegal for a retail hemp store to call itself a “dispensary” unless it holds a specific dispensing license for low-THC oil.
In recreational (adult-use) states like Colorado, California, Oregon, and Illinois, anyone 21 or older can walk into a licensed dispensary and purchase cannabis oil without a medical card. You’ll need a valid government ID. Product selection typically includes tinctures, vape cartridges, capsules, and concentrates, all with lab-tested THC percentages printed on the label. Purchase limits vary by state.
Getting a Medical Cannabis Card
In medical-only states, you need a medical marijuana card before you can buy THC oil from a dispensary. The process generally works like this: you see a physician who is registered with your state’s medical marijuana program, they conduct an in-person physical examination, and if you have a qualifying condition, they issue a certification. You then register with the state and receive your card. In Florida, for instance, renewal appointments can happen through telehealth after the initial in-person visit, which simplifies ongoing access.
Qualifying conditions vary by state but commonly include chronic pain, epilepsy, cancer, PTSD, multiple sclerosis, and Crohn’s disease. Some states have broad “debilitating condition” language that gives physicians more discretion. The card itself typically costs between $50 and $200 for the state registration fee, plus whatever the physician charges for the appointment.
Access Outside the United States
If you’re in Australia, medicinal cannabis oil is available but classified as an unapproved therapeutic good, meaning your doctor has to take extra steps to prescribe it. The two main pathways are the Special Access Scheme and the Authorised Prescriber pathway. Under the Special Access Scheme, your doctor applies to the Therapeutic Goods Administration on your behalf for approval to prescribe cannabis oil for your specific situation. If you’re seriously ill, there’s a streamlined notification-only version of this process. Alternatively, some doctors become Authorised Prescribers, which allows them to prescribe medicinal cannabis to a class of patients without seeking individual approval each time. In either case, your doctor must explain why conventional treatments already on the Australian Register of Therapeutic Goods aren’t suitable for you.
In the UK, cannabis-based medicines have been legally available on prescription since November 2018. A specialist doctor (not a general practitioner) can prescribe cannabis oil when other treatments haven’t worked. Private cannabis clinics have become the primary access point for most patients, as NHS prescriptions for cannabis remain rare.
Extraction Methods and What They Mean for You
How cannabis oil is extracted affects its purity and what ends up in the final product. The two most common industrial methods use carbon dioxide (CO2) or ethanol as solvents to pull cannabinoids out of the plant material.
CO2 extraction under high pressure is considered the gold standard because it produces a clean extract without leaving behind toxic solvent residues. When plant material is heated before extraction (a step called decarboxylation), the resulting oil contains 5 to 10 times more active cannabinoids than unheated material. One study found that this method could produce extracts with CBD and THC content around 35% each, or THC-dominant extracts reaching 77 to 88% purity. Using ethanol as a co-solvent increases the overall yield to around 30%, but the cannabinoid concentration drops below 15% because the ethanol pulls out more plant waxes and essential oils along with the cannabinoids. A follow-up purification step called winterization can remove those unwanted compounds.
For you as a buyer, this matters because extraction quality directly affects potency and safety. Products made with cheaper methods or poor purification processes may contain residual solvents or lower cannabinoid concentrations than advertised. This is another reason the COA matters: it lists residual solvent levels and confirms whether the labeled potency is accurate.