I take Magnesium Glycinate at night and Zinc in the morning. Can I add Vitamin D3? It's a training day.
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Stack check for today (training day):
✓ Magnesium + Zinc: well separated (morning/evening), no interference. ✓ Add D3: take it with your fattiest meal for optimal absorption.
Morning: Zinc (fasted or light breakfast)
Lunch: D3 (with fat: avocado, nuts, olive oil)
Evening: Magnesium Glycinate (30–60 min before sleep)
⚠️ Beta · Not a medical device · Not a substitute for professional advice
T
What happens if I take D3 and Iron at the same time?
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⚠ Recommendation: take them separately.
D3 doesn't directly inhibit iron absorption, but both compete at certain receptor pathways.
At least 2 hours apart for optimal efficacy of both. Evidence level: moderate (EFSA, NIH ODS).
920+
verified supplement pairs
139
supplements in the database
MCP
open standard, all AI clients
€0
to get started
What you get
Everything your AI assistant needs
No hallucinations. Only verified data from NIH, EFSA and PubMed. Directly in your chat.
🔬
Verified, not generated
139+ supplements. 920+ interactions. Curated by us. Not produced by AI. No hallucinations. No guesswork. Data you can trust.
🔗
In any AI you already use
One setup. Works in Claude (Pro or higher), ChatGPT (Plus or Pro), and every MCP-compatible client. No extra app. No new login.
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Your data, your rules
Your VitalStack data is stored on EU servers in Frankfurt. Delete it anytime. When using Claude or ChatGPT, your queries are processed by their servers per their own privacy policy. No lock-in to any AI provider.
Roadmap
More than a supplement checker
VitalStack is becoming the health intelligence layer for your AI assistant, with your real body data, not manual inputs.
NOW · BETA
Supplement Intelligence
920+ verified interactions. Daily plan with timing. Science explained. Directly in Claude & ChatGPT.
Q2 2026
Wearable Integration
Garmin, Whoop, Oura. No manual input. HRV, sleep, and training load flow automatically into your recommendations.
Q3 2026
Nutrition & Macros
Caloric deficit, macros, micronutrient gaps. Supplement recommendations in the context of your actual diet.
How it works
Get started in 3 steps
No setup complexity. No new interface. Just use the AI tool you already have.
1
Get early access
Sign up below. We'll send you a setup link by email when your spot opens up.
2
Connect the plugin
In Claude: Settings → Customize → Connectors. In ChatGPT: Settings → Apps → Developer Mode. Done in 2 minutes.
3
Just ask
"Which supplements should I take before my workout?" Your AI assistant now has access to verified supplement data.
Compatibility
Works with your AI tool
VitalStack runs on the open MCP standard. Any client that supports MCP works out of the box.
● Claude
Claude (Pro or higher)
Both Claude Desktop and claude.ai web require a Claude Pro plan for MCP connectors. Go to Settings → Customize → Connectors.
Settings → Customize → Connectors
● ChatGPT
ChatGPT (Plus / Pro)
Requires a paid ChatGPT subscription. Connect via the built-in connector mechanism.
⚠ Medical disclaimer: VitalStack is not a medical device and does not replace professional medical advice.
All recommendations are informational and based on general research findings.
Consult a doctor or pharmacist for personal health questions.
Get early access
Beta access, Pro trial and Founding Member offer. It all starts here.
47 people on the waitlist
No spam. Setup link & invite by email.
✓ You're on the list! We'll be in touch soon.
FAQ
Common questions
Do I need a Claude subscription?
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Both Claude Desktop and claude.ai web require a Pro plan for MCP connectors. ChatGPT requires a Plus or Pro subscription. All other MCP-compatible clients work out of the box.
Where does the supplement data come from?
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Our database contains 139+ supplements and 920+ interactions. Curated and maintained by us, not generated by AI. No hallucinations, no guesswork.
Is my health data safe?
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Your VitalStack data is stored on EU servers in Frankfurt. VitalStack never sells your data. Delete it anytime. When you query VitalStack via Claude or ChatGPT, your supplement data is processed by those AI providers per their own privacy policy.
What does it cost after beta?
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The free tier is free forever. Pro is €7.99/month. The first 100 users can become Founding Members for a one-time €49. Lifetime access, no subscription.
Which AI assistants does it work with?
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Any MCP-compatible client. Claude (Desktop and web) requires a Pro plan. ChatGPT requires Plus or Pro. Cursor, Zed, OpenClaw and more work out of the box.