SCIENCE BEHIND OUR
CORE INGREDIENTS.
Hot takes, cool insights, and all things functional — the Delulu way.
2019
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults
This randomized, placebo-controlled, crossover, and double-blind trial aimed to examine the possible effects of four weeks L-theanine administration on stress-related symptoms and cognitive functions in healthy adult
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2022
How does the tea L-theanine buffer stress and anxiety
Tea (Camellia sinensis) is widely considered to promote feelings of calming and soothing. This effect is attributed to L-theanine (L-γ-glutamylethylamide) in tea, a non-protein amino acid mainly derived from tea leaves.
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2025
l-theanine: From tea leaf to trending supplement – does the science match the hype for brain health and relaxation?
l-Theanine is a unique non-protein amino acid found abundantly in tea leaves. Interest in its potential use as a dietary supplement has surged recently, especially claims related to promoting relaxation and cognitive enhancement.
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2022
Journal: controlled trial investigating the effects of an Ocimum tenuiflorum (Holy Basil) extract (HolixerTM) on stress, mood, and sleep in adults experiencing stress
In Ayurveda, Ocimum tenuiflorum (Holy Basil) is referred to as "the elixir of life" and is believed to promote longevity and general wellbeing.
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2015
Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands
Consuming the amino-acid tyrosine (TYR), the precursor of dopamine (DA) and norepinephrine (NE), may counteract decrements in neurotransmitter function and cognitive performance.
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2015
Tyrosine for Mitigating Stress and Enhancing Performance in Healthy Adult Humans
Tyrosine, a precursor of catecholamine neurotransmitters, may help alleviate physical/cognitive performance decrements in humans under conditions of high physical/psychological stress.
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2021
Adaptogens as anti-stress agents in reducing increased plasma cortisol level during stress
The stress response involves the activation of both the sympathetic-adrenal response and the hypothalamicpituitary-adrenal axis. During times of increased stress, the adrenal gland is stimulated to produce increased levels of hormones
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