IMMUNE DEFENSE & ANTIOXIDANT SHIELD
30-day supply
Key Benefits
Strengthens immune defense against colds and infections
Supports immune defense during cold and flu season
Promotes upper respiratory health
Supports healthy inflammatory response
Recommended Dose
475mg
Take one 375mg capsule daily for ongoing immune support. During cold and flu season or at the first sign of symptoms, some people increase to twice daily for short periods. Take with food for best absorption.
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Doctor Formulated
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The Details
Elderberry has been used as a folk remedy for centuries, but it's the modern clinical research that's truly compelling. Multiple randomized controlled trials have shown that elderberry supplementation can reduce the duration and severity of cold and flu symptoms — in some studies by as much as 3-4 days.
The mechanism is elegant: elderberry's anthocyanins (the same pigments that give it that deep purple color) have been shown to inhibit viral replication by preventing viruses from attaching to and entering host cells. They also stimulate the production of cytokines — signaling molecules that coordinate your immune system's response to infection.
Beyond acute immune support, elderberry delivers a concentrated dose of antioxidants that rival blueberries and acai. These polyphenols support healthy inflammatory response, cardiovascular health, and cellular protection year-round. It's the supplement to reach for when everyone around you is getting sick, and to keep taking for ongoing immune resilience.
Research
Key studies supporting Elderberry, from peer-reviewed journals.
Randomized study of the efficacy and safety of oral elderberry extract in the treatment of influenza A and B virus infections — 2004
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
Not suitable for
Those with autoimmune conditions should consult their healthcare provider, as elderberry stimulates immune activity.
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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