Magtein Magnesium L-Threonate helps boost brain magnesium to support memory and cognitive clarity, and Source Naturals backs it with trusted quality and long standing expertise. The star ingredient magnesium l threonate crosses the blood brain barrier, delivering magnesium where it matters for learning and memory. Source Naturals has a long heritage dating back to the 1980s, with GMP quality and transparent, consistent manufacturing.

Available Sizes & Variants:

180 capsules – Brain support supplement for daily use.

Benefits & Features:

• Supports memory and cognitive clarity.
• Star ingredient magnesium l threonate crosses the blood brain barrier to raise brain magnesium.
• Long lasting formula supports daily cognitive function and mental clarity as brain magnesium levels rise, backed by rigorous manufacturing standards that Source Naturals upholds through GMP practices.
• Intended for daily use with a straightforward routine, helping you stay sharp through busy days.
• Magnesium glycinate products focus on general body health, while this magnesium supplement targets brain support.

From its early days in the 1980s, Source Naturals has built a reputation for transparent ingredients and consistent manufacturing. Magtein, the branded magnesium l threonate, is designed to elevate brain magnesium to support learning and memory, with GMP quality and third party testing for purity and potency. The brand champions practical science and reliability, helping you feel confident in a magnesium supplement that puts brain health first.

Magnesium (as magnesium L-threonate), Magtein (magnesium L-threonate), Gelatin (capsule), silica, and magnesium stearate.

• GTIN: 21078024866
• Manufacturer: Source Naturals
• Categories: Blood Pressure SupplementsL-Threonate SupplementsMagnesium Supplements, Tablets & VitaminsMinerals SupplementsNew ArrivalsPeriod PainSource NaturalsStress 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 3 capsules daily. Start with 1 capsule per day and gradually increase to 2 capsules during the day and 1 capsule 1-2 hours before bed. Take one capsule with every meal or as directed.

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

The Active Ingredient Is: Magnesium L-Threonate (Magtein)

Magnesium L-threonate is a magnesium salt created to boost brain magnesium stores and support cognitive function.

This form, marketed as Magtein, is known for its capacity to cross the blood-brain barrier and deliver magnesium to neural tissue, helping normal brain function.

What Does Magnesium L-Threonate Do?

Magnesium helps support normal synaptic function and neurotransmitter activity, which are key for learning and memory processes.

The mechanism involves delivering magnesium to brain tissue to support synaptic density and communication within neural networks, with research suggesting potential improvements in memory and cognition in older adults.

*This product is not intended to diagnose, treat, cure, or prevent any disease.

Source Naturals is a well established brand with a long standing reputation in the US supplement market, recognised for ingredient transparency and consistent manufacturing practices. This combination of heritage and reliability makes Source Naturals our chosen partner for Magtein Magnesium L-Threonate, a formulation designed to target brain magnesium delivery. The brand’s commitment to GMP practices, FDA-compliant production and routine third party testing reflects a rigorous quality mindset that aligns with our standards. This brand is also known for licensing and protecting Magtein, underscoring a focused expertise in this specialised ingredient.

Source Naturals’ product capability centres on delivering a consistent, brain-targeted magnesium form, supported by its clear manufacturing framework and documented testing approach. This enables a dependable, science‑led supply for Magtein, ensuring product integrity across batches. We evaluated the brand with our expert team of doctors, nurses, and nutritionists and confirmed alignment with our quality criteria, communicating trust and safety in every step our expert team of doctors, nurses, and nutritionists and our rigorous testing protocols. This collaboration reinforces why Source Naturals is Welzo Selected for this supplement.