Celery benefits: the trial that dropped blood pressure 11 mmHg used seed extract capsules, not celery

Key benefits

1. 01Early research

   Blood pressure fell — but on 1.34 g of seed extract, not the vegetable

   2022, Phytotherapy Research.

   • 52 patients with hypertension, triple-blind placebo-controlled crossover, four weeks
   • Four celery seed extract capsules, 1.34 g a day, or four placebo capsules
   • Assessed by 24-hour ambulatory blood pressure monitoring

   Measure	Start	At four weeks
   Systolic	141.2 ± 5.91	130.0 ± 4.38 mmHg	p<0.001
   Diastolic	92.2 ± 5.74	84.2 ± 4.87 mmHg	p<0.001
   Mean arterial pressure	108.5 ± 5.76	99.5 ± 4.66 mmHg	p<0.001
   Pulse pressure	49.0 ± 6.21	45.8 ± 6.01 mmHg	p<0.01
   Placebo group		no significant change	p>0.05

   Start with what is good here.

   First, it used 24-hour ambulatory monitoring. Blood pressure swings through the day and rises in clinics. Wearing a cuff for a day is far more accurate, and food research rarely goes that far.

   Second, it was triple-blind and crossover. Participants, researchers and analysts were all kept unaware, and each person went through both conditions.

   Third, the placebo group did not move. So this was not simply time passing.

   Now what has to be said.

   First, the intervention was not celery. It was 1.34 g of extract from the seed. There are no seeds in 100 g of celery stalk. Nothing licenses moving this result across to eating the vegetable.

   Second, 11 mmHg is drug-sized. A single antihypertensive tablet lowers roughly that much. When a compound extracted from a food produces that, look first at the limits of the data rather than at the size of the effect. Fifty-two people, one centre, four weeks.

   Third, the follow-up paper came from the same trial. The 2023 Inflammopharmacology report on anxiety and depression is not a separate study; it is a further analysis of the same participants. Two papers do not make twice the evidence.

   Fourth, it was added to people already on treatment. The paper frames the extract as a supplement alongside hypertension therapy. It is not evidence that it can replace a drug.

   The honest conclusion:

   • For celery seed extract there is a trial worth reading, with a good measurement method
   • For eating celery there is not. This site has not found a trial that fed celery stalks and measured blood pressure
   • Do not use this result to stop or reduce a blood pressure medicine. Talk to your doctor
   • The grade here is "early research"

   [1][2]
2. 02Nutrition data

   14 kcal and 95.4% water — yet high in sodium for a vegetable

   Per 100 g of raw celery:

   • 14 kcal, water 95.4 g
   • Vitamin K 29.3 µg, potassium 260 mg, sodium 80 mg
   • Folate 36 µg, fibre 1.6 g
   • Vitamin A 22 µg RAE, beta-carotene 270 µg, vitamin C 3.1 mg
   • Calcium 40 mg, magnesium 11 mg
   • Carbohydrate 2.97 g, sugar 1.34 g, protein 0.69 g, fat 0.17 g

   Per stalk (40 g):

   	100 g	One stalk (40 g)	Six stalks (240 g)
   Energy	14 kcal	6 kcal	34 kcal
   Sodium	80 mg	32 mg	192 mg
   Vitamin K	29.3 µg	11.7 µg	70 µg
   Potassium	260 mg	104 mg	624 mg

   Look at the 80 mg of sodium. That is noticeably high for a vegetable — lettuce holds 28 mg, broccoli 33 mg. Celery draws sodium up from the soil as it grows.

   At normal portions this is not a problem, since a stalk is 32 mg. A large glass of celery juice every day is different. Several stalks go into one glass, and the sodium comes along. If you are on a low-sodium diet, it is worth counting.

   Vitamin K at 29.3 µg is moderate, nothing like kale or spinach. But on warfarin, what matters is keeping vitamin K intake steady rather than swinging. If you start eating a lot more celery, tell your care team.

   Because it is 14 kcal, the claim appears that eating it burns more than it provides. This site has not found data confirming that in people. What is confirmed is simpler: it is low in energy, so it fills volume cheaply.

   Choosing and storing. Take stalks that are firm with leaves that have not wilted. Do not throw the leaves away — they are strongly aromatic and good in stock. Wipe it dry, wrap it in kitchen paper and refrigerate; it lasts far longer that way.

   If the strings bother you, one pass of a peeler along the outer ribs softens the texture.

3. 03Not established

   The celery juice cleanse, and an allergy few people here expect

   This entry is about a trend and about safety.

   First the juice. For several years now the advice has circulated to drink a large glass of celery juice on an empty stomach each morning to cleanse the body.

   This site has not found a clinical trial showing that celery juice does anything for detoxification, weight, digestion or skin. The blood pressure trial above used seed extract, not juice.

   And juicing loses something. Most of celery's 1.6 g of fibre stays in the pulp and is strained out. If fibre is what you want, juice is the wrong form. Chewing it is better.

   The sodium comes along too. If six stalks went into the glass, that is about 192 mg of sodium. Not large on its own, but worth counting if you drink it daily while watching salt.

   Now the part that is less known — allergy.

   Celery is on the European Union's list of allergens that must be declared on labels, alongside milk, egg, peanut and crustaceans. Celery allergy is not thought of as common in Korea, but enough cases have accumulated in Europe that products must carry the warning.

   Reactions range from itching around the mouth to whole-body responses. Cross-reactivity with birch pollen allergy has been reported. If your mouth itches the first time, do not brush it off.

   There is phototoxicity too. Celery contains furocoumarins, so skin carrying the juice can develop dermatitis on exposure to sunlight. It has long been reported in workers who handle celery in bulk. Trimming a few stalks at home rarely causes it, but wear gloves on a day of heavy prep and wash the juice off.

   If you are considering a seed extract supplement. The trial above used 1.34 g a day of a standardised extract. A concentrate is not the vegetable. If you are pregnant, have kidney disease, or take blood pressure medicine, speak to your doctor before starting.

How to eat it well

What to watch out for