L-theanine is a non-protein amino acid found almost exclusively in green tea leaves — the molecule behind tea’s distinctive calming profile, quite different from chamomile or valerian. The BeTheanine extract used by Dynveo is obtained by double infusion in ultra-pure water, preserving the naturally active L-isomer without organic solvents — a gentler process than chemically synthesised forms.

L-theanine acts on stress-related neurotransmitters, notably GABA and glutamate, promoting mental relaxation without daytime drowsiness. Studies show it stimulates alpha brainwave activity, characteristic of a calm-yet-alert state — making it popular with people who want to reduce perceived stress while keeping focus and working memory sharp.

Take 1–2 capsules a day with water, ideally with meals. For daytime relaxation, one capsule in the morning or early afternoon is usually enough. To ease into sleep, one capsule 30–60 minutes before bedtime is often recommended. L-theanine does not cause habituation or dependence, so it suits both prolonged and occasional use.

Manufactured and packed in France under ISO 9001 certification, with independent batch testing for active content, contaminants and microbiological purity. Not animal-tested and vegan-friendly.

For adults. Pregnant or breastfeeding women and those on medical treatment should seek advice from a healthcare professional before use. Do not exceed the recommended daily dose. This food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle. Store in a dry place away from heat and direct light.

Natural vs. synthetic L-theanine — what’s the difference?

Natural L-theanine is extracted directly from green tea leaves, preserving the biologically active L-isomer. Synthetic versions can contain a mix of L and inactive D forms. BeTheanine’s plant extraction guarantees higher purity with no solvent residues.

Does it cause daytime drowsiness?

No — this is one of L-theanine’s key strengths. Unlike classic sedative herbs, it promotes mental relaxation while preserving alertness and focus, via alpha brainwave stimulation.

How long until I feel the effects?

Relaxing effects typically appear within 30–60 minutes of taking it. For more pronounced results on sleep or daily stress, a course of several weeks is often recommended.

Herba Barona is an independent specialist supplement shop in the heart of Paris — established in 2006. What you order is genuinely on our shelves: we ship from our own stock, with no dropshipping and no long waits.

Visit us at 10 rue Théophile Roussel, Paris 12 — or use Click & Collect and pick up your order in-store. We also deliver across France and Europe. Friendly, expert advice in English from our team.

Where is the shop?

Herba Barona is at 10 rue Théophile Roussel, 75012 Paris — a two-minute walk from Ledru-Rollin (line 8), close to Bastille. Open Tuesday to Saturday, 9:30 am–6:30 pm.

Can I order online or collect in store?

Yes. We ship across France and Europe under the same conditions as our French store, or choose Click & Collect to pick up your order for free at our Paris shop.