OC spray, short for oleoresin capsicum spray, is a chemical irritant derived from hot peppers that temporarily incapacitates a person by causing intense burning pain in the eyes, skin, and respiratory system. It’s the active ingredient in what most people call pepper spray. Civilian versions typically measure around 2 million Scoville Heat Units, while law enforcement formulations can reach 5.3 million.
How OC Spray Works on the Body
Oleoresin capsicum is an oily extract pulled from hot peppers. The key compound in that extract is capsaicin, the same chemical that makes a jalapeño burn your tongue. When capsaicin lands on your skin, eyes, or the lining of your airways, it activates a specific receptor on sensory nerve endings that normally responds to heat and pain. The receptor opens, allowing a flood of charged particles into the nerve cell, which fires off an intense pain signal to the brain. Your nervous system reacts as though you’re being burned, even though no actual tissue damage is occurring at typical exposure levels.
Because OC is a natural plant extract, there’s significant variation between products. Different formulations contain different concentrations of capsaicin-like compounds, ranging from 0.18% to 3% major capsaicinoids. Two sprays labeled “pepper spray” can produce noticeably different levels of pain depending on the source material and manufacturing process.
What Exposure Feels Like
Symptoms hit fast, typically within 20 seconds of contact. The eyes slam shut involuntarily, a reflex called blepharospasm, while tears pour out and a sharp burning pain sets in. Most people also experience a burning sensation in the nose and throat, heavy nasal discharge, chest tightness, coughing, sneezing, and sometimes retching. Skin contact produces a hot, stinging sensation, and some people develop a rash.
If the person moves away from the source and gets fresh air, the worst symptoms generally start fading within 15 minutes. Eye and respiratory discomfort often linger for about an hour, and skin irritation can persist longer, especially if the compound isn’t washed off. People with asthma or other respiratory conditions are at higher risk for serious breathing difficulty, including wheezing and full asthma flare-ups.
Spray Delivery Types
OC spray comes in several delivery formats, and the differences matter depending on where and how you’d use it.
- Stream: The most common pattern. It shoots a narrow liquid line, giving you the best range and the least risk of contaminating yourself or bystanders. The tradeoff is that you need to aim more precisely.
- Cone/fog: Disperses a wide mist that’s easy to hit a target with but loses range quickly. Wind can blow it back at you outdoors, and the mist lingers in the air, affecting anyone nearby.
- Gel or foam: Sticks to the target’s face and produces almost no airborne contamination, making it the best choice for indoor use. The downside is a slower activation time of one to three minutes, since the compound needs to work through the gel layer. It can also be wiped off before it fully takes effect.
Civilian vs. Law Enforcement Strength
Sprays sold for personal self-defense typically top out around 2 million Scoville units. Police-issue sprays can reach 5.3 million Scoville units, roughly two to three times stronger. For context, undiluted capsaicin registers at about 16 million Scoville units, so even duty-grade sprays are heavily diluted. Bear sprays, interestingly, are usually less diluted than either civilian or police versions, since they need to deter a much larger animal at greater distance.
Research from the Netherlands examined whether stronger concentrations actually produced better results for police and found that the relationship between potency and effectiveness isn’t straightforward. The sprays tested ranged across three tiers of capsaicinoid concentration, from under 0.5% to above 1%.
OC Spray vs. Tear Gas
People often use “pepper spray” and “tear gas” interchangeably, but they’re different chemicals. OC spray is a natural plant-based irritant. Tear gas, most commonly CS (chlorobenzylidenemalononitrile), is a synthetic compound. Both cause tearing, burning, coughing, and temporary incapacitation, but they trigger those effects through different pathways. CS irritates mucous membranes through a chemical reaction, while OC activates pain receptors directly.
The CDC classifies both as riot control agents. In practice, CS gas is more commonly deployed for crowd control because it disperses well as a gas or aerosol over large areas. OC spray is more often used in one-on-one situations: a police officer restraining a single person, or a civilian fending off an attacker.
How to Decontaminate After Exposure
The single most important step is flushing the affected area with large amounts of cool water. If your eyes were hit, blink repeatedly under running water or a saline rinse for at least 15 minutes. Remove any contaminated clothing, since fabric traps the oily compound against your skin and prolongs the burning. Wash exposed skin with mild soap and water. Avoid alcohol-based products or harsh soaps, which can actually make irritation worse.
OC is oil-based, which is why water alone can feel slow to work. It doesn’t dissolve the way a water-soluble irritant would. Persistent flushing is still the most effective field treatment. Baby shampoo or dish soap can help break up the oil on skin. For severe eye pain that doesn’t improve with flushing, a medical provider can apply a numbing eye drop for short-term relief.
Legal Restrictions by State
OC spray is legal for civilian self-defense in all 50 states, but many states impose restrictions on canister size, buyer age, or where you can purchase it. A few notable examples:
- California: Canisters limited to 2.5 ounces. No sales to minors, convicted felons, or people with certain drug convictions.
- Massachusetts: Requires a license to buy or carry. Only licensed firearms dealers can sell it, and buyers ages 15 to 18 need a firearms identification card.
- New York: Canisters capped at 0.75 ounces with a maximum strength of 0.7% major capsaicinoids. Must be purchased in person from a licensed firearms dealer or pharmacist, with a limit of two per transaction. Shipping pepper spray into the state is illegal.
- New Jersey: Also capped at 0.75 ounces, with no possession by minors or felons.
- Hawaii: Smallest limit at 0.5 ounces, with no online sales allowed.
States without specific restrictions generally default to allowing any adult to purchase and carry OC spray without a permit. If you’re traveling between states, check canister size limits before crossing state lines, since a legal spray in one state may exceed the size cap in the next.