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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Vitamin1,000mg
Vitamin C
IMMUNE, SKIN & ANTIOXIDANT SUPPORT
Dairy freeGluten freeSoy freeGMO free
$9.99/mo
30-day supply
Key Benefits
1
Powerful antioxidant supporting immune defense
2
Promotes collagen synthesis for skin and joints
3
Enhances iron absorption from plant sources
4
Supports cardiovascular health
Wellness Goals
Recommended Dose
1,000mg
Take one 1,000mg capsule daily with food. This buffered form (Calcium Ascorbate) is gentle on the stomach, unlike pure ascorbic acid. During illness or high stress, some people take an additional capsule. Vitamin C is water-soluble, so excess is excreted — but doses above 2,000mg/day may cause digestive discomfort.
Get your personalized dose⚗️
3rd Party Tested
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Doctor Formulated
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cGMP Certified
The Details
Why you'll love it
Vitamin C does so much more than fight colds. It's a cofactor in at least eight enzymatic reactions, including collagen synthesis (which is why sailors with scurvy lost their teeth — collagen literally holds your body together). It's one of the most potent water-soluble antioxidants, neutralizing free radicals in your blood and tissues before they can damage cells.
For immune support, vitamin C concentrates in immune cells at levels 10-100 times higher than in blood plasma. During an infection, immune cells rapidly consume their vitamin C stores as they mount a defense. Regular supplementation keeps those stores topped up so your immune system can respond with full force when needed. Meta-analyses show vitamin C supplementation reduces the duration of colds and may reduce severity.
Vitamin C also dramatically enhances the absorption of non-heme iron (the form found in plant foods and supplements), making it essential for vegetarians and anyone managing iron levels. It supports collagen production for skin elasticity and wound healing, and protects LDL cholesterol from oxidation — a key step in cardiovascular disease.
Research
Clinical Evidence
Key studies supporting Vitamin C, from peer-reviewed journals.
1
Vitamin C reduces risk of death, heart disease, and cancer
Vitamin C intake and multiple health outcomes: an umbrella review of systematic reviews and meta-analyses — 2022
2
High-dose vitamin C cuts cold severity by 15%
Vitamin C reduces the severity of common colds: a meta-analysis — 2023
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.
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
Not sure if Vitamin C is right for you?
Take our 2-minute Health Assessment and let our AI build your personalized stack — every supplement chosen for your specific goals.
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