MENTAL SHARPNESS UNDER PRESSURE
30-day supply
Key Benefits
Supports dopamine and norepinephrine production
Promotes mental focus under stress
Supports thyroid hormone synthesis
May improve cognitive performance during fatigue
Recommended Dose
500mg
Take one 500mg capsule daily, ideally in the morning or early afternoon on an empty stomach for best absorption. Tyrosine competes with other amino acids for transport across the blood-brain barrier, so taking it away from protein-rich meals improves efficacy.
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The Details
When you're under stress — whether it's a demanding deadline, sleep deprivation, or intense physical exertion — your brain burns through its catecholamine reserves (dopamine and norepinephrine) at an accelerated rate. As these neurotransmitters deplete, your focus wavers, motivation drops, and mental performance suffers.
L-Tyrosine provides the raw material to replenish those reserves. As the direct precursor to dopamine and norepinephrine, tyrosine supplementation has been shown in military and academic research to maintain cognitive performance under conditions that would normally degrade it: cold stress, sleep deprivation, extended multitasking, and high-pressure environments.
The U.S. military has studied tyrosine extensively and found it reliably improves working memory, cognitive flexibility, and mood during stressful operations. It's also a precursor to thyroid hormones (T3 and T4), which regulate metabolism and energy. If your brain needs to perform at its best when conditions are at their worst, tyrosine is your backstop.
Research
Key studies supporting Tyrosine, from peer-reviewed journals.
Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course — 1999
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.
Important Information
Contraindications
If you take thyroid medication or MAO inhibitors, consult your healthcare provider before use.
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.
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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.
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