L-theanine: what the research tells us

L-theanine is one of the ingredients in Nula Calm Gum. It is an amino acid found in tea, and researchers have studied it separately from this product.

A closer look at one trial

In a 2019 randomized, placebo-controlled crossover trial by Hidese and colleagues, 30 adults took L-theanine or placebo for four weeks each. Some sleep measures improved more during the L-theanine period, but not every comparison with placebo was statistically significant.

That small study is a reason to keep researching the ingredient. It does not establish a guaranteed result for everyone, an immediate effect, or how Nula is absorbed.

Ingredient research and product evidence

The trial did not test Nula Calm Gum. Different amounts, formulations, and study settings cannot be assumed to produce the same experience.

For context on the format, read why Nula comes in gum form. The ingredient overview explains what is in Nula.

100mg per serving. calm gum →