Most common magnesium forms (citrate, bisglycinate, oxide) are poorly absorbed by the central nervous system. Magnesium L-threonate uses threonic acid, a natural vitamin C metabolite, letting magnesium travel via GLUT transporters across the blood-brain barrier — a mechanism no other form achieves, elevating magnesium directly at the neuronal level. This innovation is protected by the Magtein patent, held by ThreoTech LLC.

Magnesium contributes to normal nervous system function and normal psychological function. By reaching neurons directly, Magtein supports synaptic plasticity through NMDA receptor regulation, and clinical studies suggest this form can support memory, focus and mental clarity. Magnesium also contributes to reduced tiredness and fatigue and promotes relaxation — a valuable ally during periods of mental strain.

Take 3 capsules a day with a large glass of water, spread across the day or all at once depending on your goal. For focus and mental clarity, morning or early afternoon is often preferred; for relaxation and restful sleep, some prefer taking it in the evening, 1–2 hours before bed. Take away from heavy meals for optimal absorption. A 90-capsule bottle covers one month; consistency matters more than exact timing.

Made by Dynveo, a French laboratory in Montpellier, using licensed, authentic Magtein raw material with full batch testing. The excipient is organic coconut flour, in keeping with Dynveo’s clean-label approach.

Do not exceed the recommended dose of 3 capsules. People on medication affecting the nervous system should consult their doctor before supplementing with magnesium L-threonate. If pregnant or breastfeeding, seek medical advice first. This food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle. Store in a cool, dry place away from light and humidity. Keep out of children’s reach.

Magnesium L-threonate vs. bisglycinate — what’s the difference?

Bisglycinate is well absorbed in the gut, valued for digestive comfort and a general relaxing effect. L-threonate (Magtein) is unique in crossing the blood-brain barrier to elevate brain magnesium directly — the better choice if your focus is cognition, memory and concentration. The two can be combined.

When should I take Magtein?

Morning or early afternoon for focus and clarity; evening (1–2 hours before bed) for relaxation and sleep quality. All 3 capsules can be taken together or split.

How long before I feel the effects?

Some notice improved mental clarity within days, but memory and cognitive benefits usually build over several weeks; clinical studies ran 6–12 weeks. A course of at least one month is 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.