L-theanine sits right next to caffeine on the NERV label. Here’s what it is and why we put it there.
Where it comes from
L-theanine is an amino acid that comes almost entirely from the tea plant, Camellia sinensis. That’s the same plant behind green, black and white tea. It’s a big part of why a cup of tea feels calmer than coffee, even when the caffeine is similar. A few mushrooms have small amounts too.
What it does in the brain
L-theanine can cross the blood-brain barrier, so it acts on the brain directly. It’s associated with more alpha-wave activity, the brain-wave pattern you see when someone is relaxed but alert. Calm, not sleepy.
It’s also thought to affect some of the brain chemicals involved in mood and stress. People usually describe the feeling as “calm but clear-headed.”
What people use it for
- Staying focused for longer, especially alongside caffeine.
- Taking the edge off caffeine without making you drowsy.
- Feeling a bit more relaxed on a busy day.
Is it safe?
People have been drinking tea for centuries, so L-theanine has a long track record, and it’s generally well tolerated. That said, this is general information, not medical advice. If you’re pregnant, breastfeeding, sensitive to caffeine or managing a health condition, check with your doctor before trying a new supplement or functional drink.
Each 250 ml can of NERV FOCUS has 50 mg of L-theanine and 50 mg of caffeine. If you want to know why we pair them one to one, that’s in our other post.
This is general educational content, not medical advice.
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