Chaste Tree

The leaves and tender stem growth of the upper 10 cm (4 inches), along with the flowers and ripening seeds, are harvested for medicinal purposes. The berries are harvested by gently rubbing the berries loose from the stem. The leaves, flowers, and/or berries may be consumed as a decoction, traditional tincture, cider vinegar tincture, syrup, elixir, or simply eaten straight off the plant as a medicinal food.[7] A popular way of taking Vitex is on awakening as a simple 1:1 fluid extract, which is said to interact with hormonal circadian rhythms most effectively.[8]
The berries are considered a tonic herb for both the male and female reproductive systems. The leaves are believed to have the same effect but to a lesser degree.[7][8]
In ancient times it was believed to be an anaphrodisiac, hence the name chaste tree. --Wikipedia