Blackcurrants have polyphenols plus unusually high levels of vitamin C (an antioxidant) for a berry fruit, even higher than blueberries, raspberries and strawberries.
Pine Bark Extract
Enzogenol® is an ultra-pure extract from the bark of New Zealand grown pine trees; a broad-spectrum polyphenol extract, containing many different flavonoid compounds including oligomeric proanthocyanidins (an antioxidant).
L-theanine is a rare amino acid. It is isolated from green tea via a fermentation process, allowing it to be caffeine-free.