Historically, preparations of Olive leaf are used as an antihypertensive and diuretic.
The effectiveness of olive leaf for the claimed applications is not sufficiently documented but extract listed by mainstream suppliers of the drug are:
Antiarrhythmic and arrhythmogenic
Extract in alcohol is effective but an infusion as a tea is also very popular.
All of our plant material, is grown here on our farm in the Mary Valley, Queensland, in a completely organic, pesticide & herbicide free manner, harvested by hand and dried and stored and packed on the premises.