It's best in a concentrated extract. I drank about 4 bottles (750ml) of the stuff over a 3 month period about 18 months ago. It's GREAT stuff. Good for your heart, full of anti-oxidants and a heap of other stuff.
Here is some info from the company I got it from:
http://www.olea.com.au/product1_1.html
"The History of Olive Leaf Extract
IF YOU HAD entered through the low doorway of a Greek physician's home two millenniums ago, there is a high likelihood that you would have been advised to daily boil some Olea europaea leaves in water and drink the mixture. And the interesting fact is that this herbal mixture could well have healed your present ills and, taken regularly, may have kept you in good health for years.
Two thousand years later, people of the Mediterranean are still drinking olive leaf tea and taking olive leaf extract. If you ask them why, they will tell you with determined faces that it keeps them healthy and that it has kept their families in good health for generations.
It is only in recent years that scientific discoveries have found that these many generations of people over a score of centuries have concrete evidence to back up their claims of better health. The active ingredients in the Olea europaea's foliage are called polyphenolic antioxidants and the reputation they are getting around the world is quite remarkable.
The olive is praised throughout the Christian Bible from Noah’s Ark onwards. Some even refer to the Olea europaea as the "Tree of Life" spoken of in the last book of the Bible - Revelation 22:2.
" ...and the leaves of the tree shall be for the healing of the nations."
The earliest known usage of Olea europaea leaves for medicinal purposes was by the Ancient Egyptians more than four thousand years ago - they even used it to help preserve their mummies for the afterlife! In more modern times, leading American pharmaceutical company, Upjohn, investigated and proved the potency of some of the active compounds to fight a wide range of illnesses."
