Magnesium L Threonate is a dietary supplement that supports cognitive function and sleep by delivering highly bioavailable magnesium in the Magtein form. Formulated by doctors, it uses Magtein for superior brain delivery. That means more magnesium in the brain, which supports learning and memory. Dr Mercola has built a reputation for high quality and trusted sourcing since 1997. The capsules are gluten free, Non GMO and soy free for gentle daily use.

Available Sizes & Variants:

90 capsules - convenient daily dose for ongoing cognitive support

Benefits & Features:

• Brain friendly magnesium that is easily absorbed.
• Magnesium L Threonate crosses the blood brain barrier to raise brain magnesium, supporting learning and memory.
• Clinical research shows improvements in executive function, working memory and attention in older adults with cognitive concerns.
• Magtein, the branded form, is specifically noted for brain delivery, helping memory, focus and overall cognitive clarity with gentler digestion than many other magnesium salts.
• Non GMO, gluten free and soy free for easy daily use.

Magtein is the branded magnesium L Threonate form used in this Dr Mercola product. Scientific research shows magnesium l threonate crosses the blood brain barrier and raises brain magnesium, supporting learning and memory. A 2010 study in the Journal of Neuroscience by Slutsky and colleagues linked brain magnesium increases with Magtein to cognitive improvements. Built on Dr Mercola's health-first heritage since 1997, the formula uses non GMO, gluten free and soy free ingredients, crafted with care for daily wellness and magnesium for sleep support, and is regarded as among the best magnesium supplement options.

Magnesium (Magnesium L-Threonate)
Other ingredients: Capsule (hydroxypropyl methylcellulose), microcrystalline cellulose, ascorbyl palmitate. hydroxypropyl cellulose.

• GTIN: 813006017787
• Manufacturer: Dr Mercola
• Categories: Blood Pressure SupplementsDr MercolaL-ThreonateMagnesium SupplementsMineralsNew ArrivalsPeriod PainStress Relief & Calming Supplements
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Take three capsules each day. Take 1 capsule daily with food or as directed by a healthcare professional.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Magnesium L-Threonate

Magnesium L-Threonate is a magnesium form built to get magnesium with high brain availability to support normal brain function and overall wellness.

This form is recognised for its apparent ability to cross the blood-brain barrier and contribute to brain magnesium levels, which are linked to cognitive function and neural plasticity potential.

What Does Magnesium L-Threonate Do?

Magnesium participates in standard brain function and synaptic plasticity, which supports learning and memory processes. It may also contribute to sleep quality and relaxation as part of broader daily wellness, in line with established nutrient role concepts.

This information aligns with EFSA-style understanding of magnesium roles in the body and how higher brain magnesium levels can support cognitive function and general wellbeing.

This product isn't meant to diagnose, treat, cure, or prevent any disease.

Dr Mercola is a brand with a long-standing reputation for doctor-informed product development and trusted sourcing dating back to 1997. This heritage, combined with a commitment to high-quality ingredients and professional-grade manufacturing, makes them a natural partner for Welzo when selecting magnesium supplementation through Magtein® technology. The brand emphasises purity and comfort in its formulations, with products designed to minimise gastrointestinal discomfort and to deliver ingredients with strong purity standards.

Our team recognises the brand’s clear focus on quality controls and ingredient integrity. Dr Mercola products are described as free from GMOs, gluten and soy, and manufactured to support consistency in potency and purity. This aligns with Welzo’s requirements for robust quality practices, which we evaluate through our quality certification process.

This partnership is reinforced by our vetting approach, where we assess sourcing, manufacturing philosophy and regulatory compliance with input from our team of medical experts. The result is a product match that leverages Dr Mercola’s heritage and Welzo’s standards for quality and safety, providing a credible option for Magnesium L-Threonate supplementation.