Hello Ev, I came across this info earlier today whilst helping my daughter with her cookery project. I don't know if its exactly what you were looking for, but interesting just the same. Here goes:-
'Infusions from the seeds are used for Rheumatoid Arthritis and gout. Diluting the essential oil is also effective for these conditions.
The essential oil is used in warm water to soak painful, gouty areas of the feet.
Root tinctures have been used as a diuretic in hypertension and urinary disorders, as well as being a component in arthritic remedies or used as a kidney stimulant and cleanser.
Celery juice from the whole, fresh plant is taken for joint and urinary tract inflammations, as well as for Rheumatoid Arthritis , cystitis, or urethritis, weak conditions, and nervous exhaustion.
The root is used as an effective diuretic, urinary stones, as well as acting as a bitter digestive remedy and liver stimulant.
Although the fresh stalk has much less of the medicinal properties than other parts of the plant, eating them fresh can stimulate milk flow during lactation, although wild Celery is more effective for this.
The seeds are used mainly as a diuretic and can help clear toxins from the system, especially in cases of gout where uric acid crystals collect in the joints. Slightly bitter, they also act as a mild digestive stimulant.'
I copied this from a homework site, which I cannot now find. Sorry.