Exploring the Potential Impact of L-Theanine on ADHD

Attention-Deficit/Hyperactivity Disorder (ADHD) is a neurodevelopmental condition affecting millions globally, characterized by challenges in attention, impulsivity, and hyperactivity. Amidst the diverse approaches to managing ADHD symptoms, one substance, L-theanine, has emerged as a subject of curiosity.

In this post, we look at the potential effects of L-theanine and ADHD.

L-Theanine’s Effect on ADHD

Can L-theanine have an effect on ADHD? That’s a question we get a lot since SANS uses ginseng and l-theanine.

L-theanine, an amino acid found predominantly in tea leaves, notably in green tea, has garnered attention for its impact on brain function. Its mechanism of action involves the modulation of neurotransmitters, including dopamine, serotonin, and GABA, promoting relaxation without sedation.

Known for its ability to increase alpha brain waves, l-theanine induces a state of calm alertness, enhancing concentration and mental acuity.

Key benefits of l-theanine:

  • Relaxation
  • Improved Focus
  • Sleep
  • Blood Pressure


For people with ADHD, they have an imbalance in neurotransmitters, which affects their attention, impulse control, and hyperactivity. Some studies suggest that L-theanine’s ability to modulate these neurotransmitters might help improve certain ADHD symptoms, such as impulsivity and hyperactivity. However, more rigorous research, particularly specific to ADHD, is needed to confirm its effectiveness.

One intriguing aspect is L-theanine’s ability to increase alpha brain waves, associated with a relaxed mental state. This elevation may correlate with improvements in attention, potentially beneficial for individuals struggling with ADHD. Additionally, its impact on neurotransmitters implicated in ADHD suggests a possible avenue for managing symptoms.

Some anecdotal reports and small-scale studies have indicated that combining L-theanine with stimulant medications commonly prescribed for ADHD, like methylphenidate or amphetamine-based medications, may potentially reduce some of the side effects like jitteriness or anxiety, while possibly enhancing focus. However, this should only be done under the guidance of a healthcare professional.

The Current State of Research

While research exploring L-theanine’s influence on ADHD symptoms remains somewhat limited. One study in particular examined the acute effects of L-theanine, caffeine and their combination on sustained attention, inhibitory control and overall cognition in boys with attention deficit hyperactivity disorder (ADHD). It found that L-theanine, caffeine and their combination would improve sustained attention and impulse control in healthy adults. The combination works by “increasing reactivity of inferior frontal and dorsolateral prefrontal cortical regions of the brain that are thought to be the neural substrates of impulse control.”

While several studies suggest a potential for L-theanine to positively impact impulsivity, hyperactivity, and focus in some individuals with ADHD, the evidence is largely anecdotal or based on smaller-scale investigations.

It’s also important to acknowledge the variability in individual responses to L-theanine. Factors such as dosage, frequency, and interactions with other medications or supplements can influence its effects. Especially when considering combining L-theanine with prescribed ADHD medications, seeking professional guidance is imperative to ensure safety and efficacy.

One challenge with researching L-theanine is that it comes from tea, which contains caffeine. Caffeine is a stimulant, which are often used as treatments for ADHD. A research study conducted on animals suggests caffeine may improve memory, concentration, and focus, so it may be difficult to pinpoint the exact ingredient that offers the benefit.

Try SANS – Infused with Ginseng and L-Theanine

With a background in the health and fitness industry, it was important to our founder, Kevin Kreider, to create a beverage that was both non-alcoholic and that offered some functional benefits.

Sans - a functional beverage with ginseng l-theanine

Packed with the power of adaptogens (ginseng & L-theanine), SANS offers a healthy alternative to caffeinated and alcoholic beverages.

Experience the harmony of ancient wisdom and modern taste, and embrace a deliciously refreshing way to elevate your daily ritual.

Sans - a functional beverage with ginseng l-theanine