Celery juice does contain compounds with demonstrated anti-inflammatory activity, but the evidence comes almost entirely from lab and animal studies, not from human trials on celery juice itself. The two key compounds, apigenin and 3-n-butylphthalide, both interfere with inflammation pathways in meaningful ways. Whether drinking a glass of celery juice delivers enough of these compounds to produce noticeable effects in your body is a separate, less settled question.
The Compounds That Matter
Celery contains two main bioactive compounds relevant to inflammation. The first is apigenin, a flavonoid also found in parsley and chamomile tea. Celery and celery juice contain roughly 5 to 25 milligrams of apigenin compounds per 100 grams. That’s a modest amount compared to parsley, which packs 130 to 160 milligrams per 100 grams, but it’s still enough to be nutritionally significant if you’re drinking a full glass daily.
The second compound is 3-n-butylphthalide, sometimes abbreviated NBP. This is the chemical responsible for celery’s distinctive smell. It acts as a vasodilator, meaning it relaxes blood vessel walls, and it also reduces oxidative stress. Both compounds work through overlapping mechanisms to tamp down inflammatory signaling in the body.
How These Compounds Reduce Inflammation
Apigenin targets one of the body’s central inflammation switches: a protein complex called NF-κB. When this switch is activated, it triggers the production of inflammatory molecules like TNF-alpha, IL-6, and IL-1beta. These are the same molecules that drive the redness, swelling, and pain you feel during an inflammatory response. In lab studies, apigenin blocks NF-κB activation, which in turn reduces production of these inflammatory signals. It also suppresses COX-2, the same enzyme that common anti-inflammatory drugs like ibuprofen target.
Butylphthalide works along similar lines. Research shows it decreases the expression of IL-6, TNF-alpha, and NF-κB in animal models. It also reduces oxidative stress, the cellular damage caused by unstable molecules that can trigger and worsen inflammation. On top of that, butylphthalide relaxes blood vessels partly through nitric oxide pathways and by blocking calcium from flooding into smooth muscle cells. This vascular relaxation is why celery has a long history of use as a blood pressure remedy in traditional medicine, and clinical trials have confirmed that celery extract can lower blood pressure through these mechanisms.
What the Research Actually Shows
Here’s the important caveat: the anti-inflammatory evidence for celery compounds is strong in controlled lab settings and animal experiments, but human clinical trials specifically on celery juice and systemic inflammation are essentially nonexistent. Researchers have studied apigenin’s effects on isolated cells exposed to inflammatory triggers, and the results are consistently positive. Apigenin reduces nitric oxide, blocks inflammatory enzyme activity, and lowers levels of key inflammatory markers. In animal models of lung injury and neuroinflammation, it performs well.
But isolated cells bathed in apigenin at controlled concentrations are a different scenario from drinking celery juice and hoping enough apigenin survives digestion, enters your bloodstream, and reaches inflamed tissues at therapeutic levels. The jump from “this compound is anti-inflammatory” to “this juice is anti-inflammatory” requires evidence that doesn’t yet exist in published form. The blood pressure research is further along, with clinical trials supporting celery’s effects there, but inflammation-specific human data remains a gap.
Juicing Changes the Nutrient Profile
One thing researchers have noted is that juicing celery shifts which forms of apigenin are present. In whole, fresh celery, the predominant form is a compound called malonylapiin. In celery juice, the dominant form shifts to apiin. Both are apigenin-based, but they may be absorbed differently by your body. Juicing also removes most of the fiber, which means you lose the gut health benefits of whole celery but may absorb certain nutrients more quickly.
A 16-ounce serving of celery juice requires roughly one full bunch of celery. That concentrates the phytochemicals from multiple stalks into a single drink, which is how proponents argue you get a meaningful dose. The total apigenin content in that amount would fall somewhere in the range of 12 to 60 milligrams based on measured concentrations, though the actual amount that reaches your bloodstream after digestion is unknown.
Risks Worth Knowing About
Celery juice is safe for most people, but there are a few things to consider if you’re drinking it regularly in large amounts.
- Psoralens and sun sensitivity: Celery contains natural chemicals called furocoumarins (psoralens) that can increase your skin’s sensitivity to sunlight. A case report documented a patient who drank at least four glasses of celery juice per week for six months before developing a phototoxic skin reaction after sun exposure. At high enough doses, psoralens can cause severe burns and blistering when combined with UV light.
- Blood thinner interactions: Celery contains coumarins, which are compounds that can theoretically interact with blood-thinning medications like warfarin. No clinical evidence has confirmed this interaction, but it’s classified as a plausible concern in pharmacology reviews.
- Oxalate content: Raw celery is relatively low in oxalates, about 3 milligrams per stalk. Cooked celery is higher at around 10 milligrams per cup. Juicing a full bunch concentrates this, but celery still falls well below high-oxalate foods like spinach or beets. If you have a history of calcium oxalate kidney stones, it’s worth factoring in but probably not a dealbreaker.
The Empty Stomach Claim
You’ll often see the recommendation to drink celery juice first thing in the morning on an empty stomach and wait at least 15 minutes before eating anything else. This advice traces back to wellness influencers rather than published research. There is no peer-reviewed evidence showing that an empty stomach improves absorption of celery’s anti-inflammatory compounds. Some health systems have repeated the recommendation, but they acknowledge the supporting studies are still lacking. Apigenin absorption likely depends more on your gut microbiome and the food matrix it’s consumed with than on whether your stomach is empty.
Putting It in Perspective
Celery juice genuinely contains compounds that fight inflammation at the molecular level. Apigenin suppresses the same enzyme that ibuprofen targets, and butylphthalide reduces key inflammatory markers while relaxing blood vessels. These are real biochemical effects, not marketing fiction. But the dose you get from a glass of celery juice is modest compared to what’s used in lab experiments, and no one has yet measured whether drinking celery juice daily produces detectable changes in inflammatory markers in human blood.
If you enjoy celery juice and it fits into your routine, it’s a reasonable source of anti-inflammatory phytochemicals alongside other flavonoid-rich foods like berries, leafy greens, and green tea. Treating it as a standalone anti-inflammatory treatment, though, goes further than the current science supports.