Celery Seed

Apium graveolens · the aromatic seed, and the allergen we declare

All articles checked for accuracy against the GB NHC Register and all sources have citations with verified links to their relevant studies.

Celery seed is a tiny, highly aromatic spice with a distinct chemistry — and an allergen every label must declare. This page explains what celery seed is, what’s in it, and how regulators view botanical claims.

This article summarises the botany, key chemistry and the published research around celery seed, and sets out the safety points that matter for a supplement label. It makes clear which types of claims are not permitted for botanicals and why the allergen declaration is the first thing a consumer should see.

Ingredient Snapshot

What it is

The small, aromatic seed of the celery plant, used as a spice and botanical ingredient.

Where from

Apium graveolens (celery) seeds, traditionally harvested from the cultivated plant.

Known for

Characterised by a volatile oil rich in limonene and distinctive phthalides; a declared allergen.

In WellsparQ

• Electro levels80 mg

Celery seed is the small, ridged, intensely aromatic seed of the same plant that gives us the salad stalk. A pinch smells unmistakably of celery — greener and more concentrated than the vegetable itself. It is an old kitchen and herbal ingredient, and it carries one thing that must always be said plainly first: celery is a declared allergen. Our factsheet card is unambiguous — note for allergies: this product contains celery. This page covers the botany, the volatile-oil chemistry, the research read honestly as research, and the safety points that matter.

Rooted in nature. Backed by research.

The plant and the seed

Celery is Apium graveolens, a biennial in the carrot family (Apiaceae) — the same family as carrot, fennel, parsley and coriander. The plant we eat as a vegetable is the cultivated form; the seed used as a spice and in herbal preparations is tiny, brown and highly fragrant ^¹. Celery has a long culinary and folk history across Europe, the Mediterranean and Asia, used as a seasoning and, traditionally, in herbal practice — points we record as cultural history, not as evidence of any health effect.

The chemistry: a volatile oil built on phthalides

What defines celery seed is its volatile (essential) oil, present at roughly 2–3% of the seed. The bulk of that oil is made of terpenes — limonene makes up around 60% and selinene around 20% — but the character, the true celery smell, comes from a group of minor compounds called phthalides ^¹.

These phthalides — notably 3-n-butylphthalide (3nB), sedanolide and sedanenolide — are present only at low percentages, yet they are the signature aroma molecules of the plant ^¹. Celery seed also contains apiol, other aromatic constituents, and flavonoids such as apigenin ^². It is the phthalides that most of the pharmacological research has focused on.

How WellsparQ measures it

Celery seed appears in the WellsparQ range in one place, as a declared, single amount.

Source: WellsparQ Supplements Database.

In Electro levels — an electrolyte-style formula — celery seed sits as a traditional aromatic botanical companion at a modest 80 mg. It is declared by weight, and, more importantly, it is declared as an allergen on the product. Celery seed is a plant ingredient and, as a natural botanical, is suitable for vegetarians and vegans. The one thing it is never suitable for is anyone with a celery allergy — which is why the allergen statement leads, not follows.

The evidence base, as evidence

Celery and celery seed have a reasonable body of published work, most of it early-stage. Reading it honestly:

• Composition and chemistry. Review articles document the volatile oil, the phthalides and the flavonoids, and describe antioxidant and other activities measured in the laboratory ^¹². This is chemistry, not a statement about any person's health.
• Blood pressure — animal work. The phthalide 3nB has attracted interest for cardiovascular research. A 2013 study in the Journal of Medicinal Food reported an antihypertensive effect of celery seed extract on rat blood pressure after chronic administration ^³. Animal findings can motivate further study, but they do not establish an effect in people, and we present them strictly as such.
• Narrative reviews. A 2024 narrative review in the International Journal of Food Science gathered the current knowledge on celery and blood pressure, and — as narrative reviews do — described a mixed, preliminary picture that calls for properly controlled human trials ^⁴.

The honest summary: a well-characterised aromatic seed, some interesting phthalide chemistry, mostly preclinical or early evidence, and — crucially — no authorised food health claim.

Safety and sensible use

Celery seed needs more safety detail than most kitchen spices, and it deserves it.

• Allergen (declared). Celery — including the seed — is one of the 14 substances that must always be declared on food and supplement labels under retained EU Regulation 1169/2011 (Annex II, item 9: celery and products thereof) ^⁵. Reactions in sensitive individuals can be significant. Anyone with a known celery or Apiaceae allergy should avoid Electro levels. The card's contains celery line is a safety instruction, not a formality.
• Photosensitivity. Celery contains furanocoumarins (psoralens). In the presence of UV-A light these can provoke phytophotodermatitis — a phototoxic skin reaction — most classically from handling the plant, and, less commonly, reported with very high intakes ^⁶. It is a recognised property of the plant worth noting for a botanical page.
• Pregnancy caution. Celery seed has a traditional reputation as a uterine stimulant, and standard herbal-safety practice is to avoid concentrated celery seed preparations in pregnancy. Anyone pregnant or breastfeeding should speak to a GP or pharmacist before use.
• General. Anyone on prescribed medication (including blood-pressure or diuretic medicines) or with a kidney condition should take advice before starting a celery-seed supplement.

Where it fits your day

In Electro levels, celery seed is a traditional aromatic note within an everyday electrolyte routine — taken with water, at your own pace. It is declared honestly by weight and, first of all, as an allergen. Measured properly, told straight: the supporting cast to how you live. It's a lifestyle.