L-Theanine 200mg + Caffeine 100mg
The scientifically validated 2:1 theanine:caffeine ratio. Calm, sustained focus without jitteriness or crash. Effective in 30 minutes.
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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.
L-Theanine and caffeine are the most studied nootropic combination available. A 2008 RCT (Owen et al.) found the combination significantly improved attention, alertness, and task performance vs caffeine alone or placebo — while reducing caffeine's anxiety-inducing side effects.
Suntheanine® L-theanine is produced by enzymatic synthesis to >99% purity — the same form used in clinical trials.
Benefits
- ✓Focus
- ✓Calm
- ✓Alertness
- ✓Reduced anxiety
- ✓Cognitive performance
Complete your stack
✨What customers say
From 20 reviews★ 4.8Customers appreciate the clean, sustained energy and focus provided by the combination of L-theanine and caffeine, particularly noting the absence of jitters and crashes.
Some users wish for larger quantities or faster onset times, with a few noting it takes 20-45 minutes to feel the effects.
This product is ideal for students, remote workers, and anyone needing enhanced focus and productivity without the anxiety associated with caffeine alone.
Customer reviews
- ★★★★★Anna S.16/05/2026Perfect pre-work focus stack
The combination of L-theanine and caffeine is well-researched and the 2:1 ratio here is exactly right. I get the alertness of caffeine without the jitters or anxious edge. Superb for morning focus.
- ★★★★☆Amy N.13/05/2026Great for studying
As a postgraduate student, focus is everything. This combination helps me sustain concentration during 3–4 hour study blocks. No tolerance issues after 2 months of use.
- ★★★★★Ian C.09/05/2026Smart caffeine use
This is how caffeine should be consumed. L-theanine smooths the peak and trough, delivering steady, clean alertness for hours. Very effective and no negative side effects whatsoever.
- ★★★★★Mel C.08/05/2026No more caffeine anxiety
I love the energy boost of caffeine but hate the jitters. This solved that entirely. The theanine takes the edge off while preserving the alertness. I'll never take caffeine alone again.
- ★★★★★Karen B.02/05/2026Stress-free energy boost
Unlike straight caffeine, this gives me energy without the stress response. My productivity has improved markedly since switching from coffee to this combination. Highly recommend.
- ★★★★★Jess T.30/04/2026Clean, smooth energy
No jitters, no crash, just clean sustained focus for 4–5 hours. The theanine really does smooth out the caffeine effects. I use this before any mentally demanding work.
- ★★★★☆Steve B.21/04/2026Does exactly what it promises
Clean cognitive enhancement without side effects. I take it before any demanding creative work and notice a genuine improvement in focus and sustained concentration. Would buy again.
- ★★★★★Paul J.12/04/2026Best cognitive supplement value
At this price point for 200/100mg dosing, this is outstanding value. Clean ingredients, correct ratio, real effects. I've recommended it to all my colleagues.
- ★★★★★Carl B.06/04/2026Replaced my third coffee
I was drinking 4 cups of coffee a day and getting caffeine crashes. Replaced my afternoon coffee with this stack instead. Cleaner energy, no crash, better focus for afternoon work.
- ★★★★☆Diane P.02/04/2026Works quickly and reliably
Takes about 20 minutes to kick in. I use it before any task that requires sustained focus. The effects are real — improved attention span and significantly less mental fatigue during long sessions.
- ★★★★☆Tara S.26/03/2026Consistent daily performance
Three months of daily use. I take it with breakfast and it sets me up for a focused morning. No tolerance build-up that I've noticed. Good quality product.
- ★★★★★Josh L.17/03/2026The best way to take caffeine
If you use caffeine for performance, you should be combining it with L-theanine. The synergy is well-documented. Medibro's capsules are convenient and the dose is exactly what the research recommends.
- ★★★★★Kim R.10/03/2026Excellent for remote work focus
Working from home makes it hard to stay in the zone. This stack has become essential for my morning routine. I'm more productive and focused without the anxiety spike I get from coffee alone.
- ★★★★★Rob K.07/03/2026Better than caffeine alone
I've always been sensitive to caffeine. Taking L-theanine alongside it removes the anxious edge completely while keeping the mental sharpness. This ratio (200mg:100mg) is ideal.
- ★★★★★Rachel T.07/03/2026Brilliant combination
The 200mg theanine to 100mg caffeine ratio is the gold standard for cognitive enhancement. These capsules deliver that exact ratio cleanly. I'm sharper, calmer, and more productive.
- ★★★★★Nick W.05/03/2026Finally found my focus supplement
Tried many nootropics over the years. The evidence for L-theanine + caffeine synergy is the strongest of anything I've tried. These capsules are good quality and the price is very reasonable.
- ★★★★★Pete H.04/03/2026A daily must-have
I've taken this combination for 6 months now. Consistent, reliable focus enhancement with no negative side effects. The capsules are easy to swallow and the dose is correctly proportioned.
- ★★★★★Ryan M.Verified buyer16/02/2026Perfect nootropic stack
The 2:1 theanine:caffeine ratio is the golden ratio for clean focus. No jitters, no crash, just calm alertness. Replace my afternoon coffee with this and my productivity is noticeably better.
- ★★★★☆Liam O.Verified buyer13/01/2026Good focus supplement
Works well for studying. The combination is definitely superior to caffeine alone. Takes about 30-45 minutes to kick in. Would give 5 stars but I wish it came in larger quantities.
- ★★★★★Charlotte E.Verified buyer08/12/2025Works exactly as advertised
Anxious coffee drinker here. Theanine plus caffeine is genuinely a better combination than caffeine alone. The calming effect balances the caffeine stimulation perfectly. Focus without anxiety.
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