Magnesium L-Threonate 2000mg — Cognitive & Sleep
Magtein® magnesium L-threonate — the only form of magnesium shown to cross the blood-brain barrier and increase brain magnesium levels. Premium cognitive and sleep support.
What does optimal health cost per day?
Less than a coffee top-up. Optimal nutrition for 67p/day — the most cost-effective investment in your health.
Free Vitamin C 1000mg with orders over £40
While stocks last · auto-added at checkout
Supply size
Most customers reorder this monthly. Each pack lasts ~30 days.
Subscribe and save 15% — never run out. Switch to subscription
Your daily health investment
£1.23
per day
£8.61
per week
£36.99
per month
Less than a daily coffee — for daily nutritional support from Magnesium L-Threonate.
Auto-delivered. No minimum term. Cancel any time.
Price locked forever — we never raise your subscription price. Cancel any time, no fees.
Bundle and save up to 20%
Add 2+ products to your stack — discount applied automatically at checkout.
Not ready to commit? Try a 7-day sample pack
Only £2.99 — credited toward your first full order
Group buy — save up to 30%
Limited spotsPool orders with other Magnesium buyers. The more people join, the more everyone saves. Next group buy runs when we hit 50 registrations.
📦 What to expect when it arrives
Premium box
Double-sealed. No cheap poly bags — every Medibro order ships in a quality box.
Amber glass
UV-protective amber glass preserves potency. Satisfying click-lid seal.
Little extras
Every first order includes a usage guide and a surprise freebie — see what you get.
Start today
Take your first dose the day it arrives — don't wait for a 'perfect moment'.
Your 30-day journey starts today
Future you will look back on this moment.
Based on typical customer reports. Individual results vary. Backed by our 30-day guarantee.
Premium packaging, inside and out
Amber glass jar
Blocks UV degradation, no plastic leaching
100% recyclable
Jar, cap, and box are fully kerbside recyclable
No artificial fillers
No magnesium stearate, silicon dioxide, or titanium dioxide
- Free UK delivery over £35
- 14-day hassle-free returns
- Secure checkout, audit-logged
- Manually compliance-reviewed
Order dispatched, tracking info sent. Most customers take their first dose the day it arrives.
Research shows it takes ~14 days to anchor a new habit. By now, most customers have found their ideal time of day.
At 8 weeks, customers report the strongest improvements. Consistency is everything with nutritional supplements.
Over 90% of Medibro subscribers are still on the same product at 3 months — the clearest signal a supplement is working.
Seasonally relevant now
July: Peak activity season — optimise performance with the right stack
Magnesium L-threonate (Magtein®) was developed at MIT by Dr Guosong Liu and colleagues. Unlike other magnesium forms, it significantly crosses the blood-brain barrier, increasing CSF magnesium levels and synaptic density.
Animal studies showed improvements in cognitive function and memory. Human trials are ongoing. This is the premium choice for those specifically targeting brain health and cognitive sleep quality.
Benefits
- ✓Cognitive function
- ✓Memory
- ✓Sleep quality
- ✓Brain health
- ✓Neural plasticity
Dosing Guide
How to take Magnesium L-Threonate 2000mg — Cognitive & Sleep
Take 3 capsules daily: 1 in the morning, 2 before bed.
Always read the label. Consult a healthcare professional if you have any medical conditions or take prescription medication.
Quality & transparency
Why form matters
Medibro uses
Magnesium Bisglycinate
~80% absorbed
Others often use
Magnesium Oxide
Lower bioavailability
Glycinate is chelated — bound to an amino acid that the gut treats like food, not a mineral.
Oxide form passes through largely unabsorbed and commonly causes digestive discomfort. Studies show bisglycinate delivers 3-4x more elemental magnesium to cells.
How we compare
Medibro vs. typical high-street / marketplace alternatives
| Feature | Medibro | Others |
|---|---|---|
| Form | Glycinate (high absorption) | Oxide (poor absorption) |
| Elemental Mg per serving | 400mg | 100–200mg |
| Third-party tested | ||
| Filler-free capsules | ||
| 30-day guarantee | ||
| UK manufactured |
SACN identifies widespread magnesium inadequacy
The National Diet and Nutrition Survey found the majority of UK adults — especially women — consume below the Reference Nutrient Intake for magnesium.
Source: NDNS Rolling Programme 2019
Magnesium works best alongside:
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Your personalised stack
Recommended to pair with Magnesium L-Threonate
What to expect over time
Cellular magnesium levels start rising. Some people notice slightly improved sleep quality within the first few days.
Most users report deeper sleep and reduced evening anxiety. Muscle tension may ease noticeably.
Cellular magnesium at optimal levels. Energy, mood stability and muscle recovery consistently better.
Cardiovascular and bone benefits accumulate. Chronic deficiency symptoms resolve fully for most users.
What to expect
A realistic week-by-week guide for first-time users
The most common first change: falling asleep faster and fewer night wakings.
Muscle tension and cramps typically improve by week 2. Evening anxiety often softer.
Magnesium-dependent enzymes are now optimally supported. Most notice more stable energy and mood.
Cardiovascular and metabolic benefits become measurable. This is your new baseline.
Individual results vary. Consistency is key — don't assess before week 6.
Clinical evidence
Peer-reviewed research⏰ How to take for best results
Best time
Evening, 1 hour before bed
Take with
Water or food — reduces any GI sensitivity
Avoid with
Zinc supplements (competing absorption)
Magnesium glycinate is gentle enough to take any time. Evening use supports sleep quality.
Personalised dose calculator
For guidance only. Consult your pharmacist or GP if you take prescription medication.
Frequently asked questions
Pairs perfectly with
15% off when bought togetherVitamin D3+K2
Essential co-factor
D3 and magnesium work synergistically — each improves the other's absorption
Bundle total: £51.98 → £44.18
Find your perfect supplement stack
Answer 4 quick questions and get a personalised stack built around your goals, health history, and lifestyle.
Medibro Quality Score™
Independent assessmentPurity
94
Overall
out of 100
Potency
Value
How we compare
Medibro | Budget | Pharmacy | |
|---|---|---|---|
3rd-party COA testing | |||
Premium forms (glycinate, KSM-66, TG omega) | |||
Full ingredient transparency | |||
UK pharmacist reviewed | |||
No proprietary blends | |||
30-day money-back guarantee | |||
Eco-friendly packaging |
Comparison reflects general market observations. Specific brands may vary.
What outcomes matter most to you?
🌍 Ingredient sourcing
Magnesium Glycinate
Netherlands
Chelated for superior absorption
Glycine
Germany
Pharmaceutical-grade amino acid
UK deficiency data
Over 60% of UK adults consume below the recommended daily magnesium intake
Source: National Diet and Nutrition Survey, 2019
Common symptoms
Higher risk if
This information is educational. Always consult your GP before supplementing if you have a health condition.
Founded by a UK pharmacist
“After 12 years dispensing prescriptions, I was frustrated by the gap between expensive supplements and what the evidence actually supports. Medibro was built to source properly — clinical doses, verified purity, fair prices.”
— MPharm, GPhC registered · Medibro founder
Every formula is reviewed by our in-house pharmacy team before launch.
Supplement Interactions
What can I safely combine this with?
Magnesium is required to convert Vitamin D to its active form. Without adequate magnesium, Vitamin D supplementation is far less effective.
Magnesium and zinc can compete for absorption. Take at least 2 hours apart for optimal uptake of both minerals.
Magnesium and calcium work together in muscle contraction/relaxation. A 2:1 calcium:magnesium ratio is generally recommended.
⚕️ Always consult a healthcare professional before combining supplements with medication.
Stack Synergies
Science-backed pairings for better results
Magnesium is D3's essential co-factor — both nutrients activate each other synergistically
B6 significantly increases intracellular magnesium uptake and retention
Complementary minerals supporting immune function, testosterone, and sleep quality
Synergies based on published nutritional science. Individual results may vary. Always consult a healthcare professional before combining supplements.
Complete your stack
✨What customers say
From 20 reviews★ 4.6Customers appreciate the unique formulation of magnesium L-threonate, noting significant improvements in cognitive functions such as memory recall and concentration after a few weeks of use. Many highlight its ability to cross the blood-brain barrier, which is supported by scientific research.
Some users mention the high price compared to standard magnesium supplements and note that the effects can take 4-6 weeks to become noticeable, requiring patience before seeing results.
This product is ideal for individuals seeking cognitive enhancement, particularly those in their 50s and older experiencing age-related memory issues, as well as students or professionals under cognitive stress looking to improve focus and mental clarity.
Customer reviews
- ★★★★☆Alfie B.26/04/2026Premium magnesium for cognitive health
Twice the price of standard magnesium but the cognitive research justifies it for my use case.
- ★★★★★Charlotte F.23/04/2026Only magnesium that crosses to the brain
The science on L-threonate is unique - it's the only form proven to raise brain magnesium levels. Effects are different from other forms.
- ★★★★☆George M.18/04/2026Takes 4-6 weeks to notice
No immediate effects but at the 6 week mark I noticed improved word recall and concentration. Worth the patience.
- ★★★★★Thomas A.07/04/2026Brain fog has lifted
After 6 weeks of magnesium L-threonate I feel mentally sharper. Memory and focus are genuinely improved.
- ★★★★☆Poppy W.30/03/2026Takes 4-6 weeks to notice
No immediate effects but at the 6 week mark I noticed improved word recall and concentration. Worth the patience.
- ★★★★☆Amelia K.23/03/2026Takes 4-6 weeks to notice
No immediate effects but at the 6 week mark I noticed improved word recall and concentration. Worth the patience.
- ★★★★☆Patricia C.17/03/2026Expensive but worth it
The most expensive magnesium form. But the brain penetration data is real. Noticed improved word recall and focus within 3 weeks. For cognitive maintenance in the 50s this is the right form.
- ★★★★★Alfie B.11/03/2026Brain fog has lifted
After 6 weeks of magnesium L-threonate I feel mentally sharper. Memory and focus are genuinely improved.
- ★★★★★Charlotte F.11/03/2026Brain fog has lifted
After 6 weeks of magnesium L-threonate I feel mentally sharper. Memory and focus are genuinely improved.
- ★★★★☆Sophie R.08/03/2026Premium magnesium for cognitive health
Twice the price of standard magnesium but the cognitive research justifies it for my use case.
- ★★★★★Alfie B.07/03/2026Brain fog has lifted
After 6 weeks of magnesium L-threonate I feel mentally sharper. Memory and focus are genuinely improved.
- ★★★★★Grace S.02/03/2026Only magnesium that crosses to the brain
The science on L-threonate is unique - it's the only form proven to raise brain magnesium levels. Effects are different from other forms.
- ★★★★☆Emma W.22/02/2026Premium magnesium for cognitive health
Twice the price of standard magnesium but the cognitive research justifies it for my use case.
- ★★★★★Sarah M.16/02/2026Only magnesium that crosses to the brain
The science on L-threonate is unique - it's the only form proven to raise brain magnesium levels. Effects are different from other forms.
- ★★★★★Mia J.11/02/2026Only magnesium that crosses to the brain
The science on L-threonate is unique - it's the only form proven to raise brain magnesium levels. Effects are different from other forms.
- ★★★★☆William L.31/01/2026Takes 4-6 weeks to notice
No immediate effects but at the 6 week mark I noticed improved word recall and concentration. Worth the patience.
- ★★★★★Helen B.Verified buyer15/12/2025Cognitive clarity is remarkable
At 55 and noticing age-related memory issues. My neurologist suggested magnesium-L-threonate specifically. After 8 weeks: word-finding is easier, remember names better, more cognitively sharp overall. This is a premium supplement.
- ★★★★★Richard F.Verified buyer28/11/2025Better than standard magnesium for brain
Have taken magnesium glycinate for years (excellent for sleep). Added L-threonate for cognitive benefits. Synergistic effect — sleep quality maintained AND cognitive function improved. Different compounds, different targets.
- ★★★★★Dr. A. S.Verified buyer14/11/2025Superior brain penetration — proper supplement
The threonate form is the only magnesium that demonstrably crosses the blood-brain barrier in meaningful quantities. Cognitive neuroscientist here. Subjective improvements in memory consolidation and learning within 4 weeks. The MIT research on this is solid.
- ★★★★★James L.Verified buyer25/10/2025Exam performance improved
Postgraduate student under heavy cognitive load. Added L-threonate 4 weeks before final exams. Clearer thinking, better recall of complex information. More energy for studying. The product is properly formulated.
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