CALM FOCUS WITHOUT THE DROWSINESS
30-day supply
Key Benefits
Promotes calm focus without drowsiness
Supports relaxation and stress resilience
May improve sleep quality
Enhances alpha brain wave activity
Recommended Dose
200mg
Take one 200mg capsule daily. For calm focus, take in the morning or early afternoon (pairs excellently with coffee or tea). For sleep support, take 30-60 minutes before bed. Theanine is non-habit-forming and does not cause daytime drowsiness.
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The Details
Ever wonder why a cup of green tea feels so different from coffee, even though both contain caffeine? The secret is L-Theanine. This amino acid, found almost exclusively in tea leaves, crosses the blood-brain barrier and promotes alpha brain wave activity — the frequency associated with calm, focused attention. It's the state of mind you experience during meditation or creative flow.
Theanine works beautifully on its own for stress and anxiety relief, but it truly shines when paired with caffeine. Research shows the combination improves attention, reaction time, and cognitive performance more than either compound alone — while theanine takes the jittery edge off caffeine. It's focused energy without the crash.
At bedtime, theanine supports sleep quality not by sedating you but by calming the mental chatter that keeps you awake. Studies show it reduces resting heart rate, lowers stress markers, and helps people fall asleep faster by promoting relaxation. It's remarkably versatile: take it in the morning for focused calm, pair it with coffee for clean energy, or take it at night for better sleep.
Research
Key studies supporting Theanine, from peer-reviewed journals.
Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis — 2014
The effects of green tea amino acid L-theanine consumption on the ability to manage stress and anxiety levels: a systematic review — 2020
Study titles are simplified for readability. Provided for informational purposes — not medical advice.
Transparency
Every batch is independently tested by ISO-17025 accredited labs for purity, potency, and contaminants.
Designed by healthcare professionals using evidence-based research and clinical expertise.
Manufactured in cGMP & UL certified, FDA-registered facilities with a flawless inspection record.
As with any natural health product, consult your healthcare practitioner. Store in a cool, dry place. Keep out of reach of children. Discontinue use immediately if you experience an adverse event.
What people say
Really good supplement brand. The daily pack format is so convenient and I've been 100% consistent because of it. The quiz was genuinely thorough. Knocked one star off because I'd love the option to add or remove individual supplements as I learn more about my body.
I've tried so many supplements and honestly nothing has worked like this. The quiz is actually thorough and the results show it. Energy is UP, recovery is UP, sleep is SO much better. Can't believe it took me this long to find this brand.
Three weeks in and I already feel the difference. My morning energy is COMPLETELY different. No more dragging myself out of bed. The personalization through the quiz is what makes it work — it's not just a generic multivitamin. Stack actually thought about what MY body needs.
I've been on a health optimization journey for about three years and have tried what feels like every supplement brand on the market. Most of them are either generic multivitamins dressed up in pretty packaging, or they're so specific that you need to be a nutritionist to understand what you're actually taking. Stack sits in a completely different category. The quiz is the first thing that impressed me. It asks genuinely intelligent questions — not just 'how old are you and what's your gender' but questions about your diet, your sleep patterns, your stress levels, your exercise frequency. It felt like a real consultation rather than a data collection exercise. The pack that arrived was clearly personalized to my answers. After six weeks, the improvements have been consistent and measurable: better sleep quality, more stable energy throughout the day, and noticeably faster recovery after my runs. My partner commented that I seemed more 'on' in the evenings rather than crashing after dinner. The daily pack format is brilliant for compliance — I've been 100% consistent because the habit is so frictionless. One pack, done, every morning. No bottles, no measuring, no forgetting half of them. Genuinely one of the best health investments I've made.
My focus at work has been sharper and I'm waking up without that groggy feeling I used to have every morning. Told two friends about Stack already. Customer support was also really helpful when I had a question about one of the ingredients.
honestly wasn't sure about it at first but three weeks in and i'm so glad i tried it. energy is way better, i'm sleeping properly for the first time in months. the quiz was really detailed which gave me confidence it was actually personalized. would 100% recommend.
Personalized for you
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