My evenings have completely changed
I used to be useless after 7pm. Now I have energy into the evenings and actually enjoy time with my family rather than just surviving until bedtime. Stack has genuinely changed my quality of life.
Nour M.
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Amino Acid500mg
Tyrosine
MENTAL SHARPNESS UNDER PRESSURE
Dairy freeGluten freeSoy freeGMO free
$10.99/mo
30-day supply
Key Benefits
1
Supports dopamine and norepinephrine production
2
Promotes mental focus under stress
3
Supports thyroid hormone synthesis
4
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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3rd Party Tested
🩺
Doctor Formulated
🛡️
cGMP Certified
The Details
Why you'll love it
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
Clinical Evidence
Key studies supporting Tyrosine, from peer-reviewed journals.
1
Tyrosine boosts memory and focus during intense military training
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
What's Inside
Third-Party Tested
Every batch is independently tested by ISO-17025 accredited labs for purity, potency, and contaminants.
Doctor Formulated
Designed by healthcare professionals using evidence-based research and clinical expertise.
cGMP Certified
Manufactured in cGMP & UL certified, FDA-registered facilities with a flawless inspection record.
Important Information
Contraindications
- thyroid medication
- maoi medication
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
changed my whole routine tbh
used to take like 5 different supplements every morning and always forgot at least two of them. now i take one stack pack and that's it. so much simpler. and the results are actually better. wild.
Hazel B.
The value proposition is actually excellent
I calculated what I was spending on separate supplements, gym supplements, and energy drinks before Stack.
Tim A.
Simple, smart, and it actually works
The packaging is some of the nicest I've seen in wellness. But beyond aesthetics, the product delivers. My energy throughout the day is more stable and I'm recovering faster from workouts. I was genuinely skeptical.
Ashley N.
The inflammation reduction has been significant
I suffer from low-grade chronic inflammation and it affects everything - energy, mood, joint comfort. Stack's personalized formula has noticeably reduced these symptoms over three months. The targeted approach is clearly more effective than generic options.
Eric T.
My husband noticed before I did
About six weeks in my husband said I seemed more like myself - more energy in the evenings, less irritable, sleeping better. I hadn't even consciously registered how much had changed until he said it.
Amara S.
Personalized for you
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