If you reach for a cup of green tea for a moment of ‘zen’ when you’re stressed, this could be because you’re unwittingly craving the L-Theanine it contains.

The amino acid that gives your green tea it’s savoury (umami) flavour, L-Theanine is neither classified as “essential” (common in our diets) or “non-essential” (manufactured by the body) – meaning it’s tricky to come by. With a chemical structure that closely resembles glutamine (a naturally occurring amino acid that acts as a neurotransmitter) L-Theanine can cross the blood-brain barrier and influence our brain waves – helping to dampen our nerves when we’re feeling especially fraught or to weather those high-pressure spells without starting to fray… Plus, these easy-to-swallow capsules are vegan, kosher and free from both gluten and dairy.