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NIH Supplements, Facts First

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Scan your supplement bottle. Check drug interactions instantly. Get evidence-based answers — all from NIH data you can trust.

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Powered by NIH ODS DailyMed OpenFDA DSLD
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Resin Health
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Let's check your supplements
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Vitamin D3
1000 IU • Nature Made
✓ Safe 1 Alert
Amlodipine interaction: Take calcium 2+ hours apart. Vitamin D may increase calcium absorption.
Calcium Citrate
500mg • Citracal
2 Alerts
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Safety
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Supplement database
1,259 products indexed
Drug interactions
21 fully mapped profiles
Data sources
5 NIH databases
Accessibility
WCAG AA compliant
How It Works
Three steps to safer supplement use
No sign-up. No downloads. Evidence-based answers in under 30 seconds.
Step 1
Search
Type a supplement name or scan the barcode on your bottle. We match it to the NIH Dietary Supplement Label Database instantly.
Step 2
Check
See drug interactions flagged by severity — green, amber, or red. Know what's safe and what to discuss with your healthcare provider.
Step 3
Learn
Ask questions in plain English or watch a 60-second explainer video. Every answer is grounded in NIH fact sheets with cited sources.
Live Interaction Checker

The interactions your pharmacy might miss

Over 40% of adults 65+ take five or more medications alongside supplements. Resin Health cross-references your supplements against DailyMed drug interaction data — the same database pharmacists use — and flags conflicts in plain language.

40%
of seniors take 5+ medications
23%
experience adverse interactions
Try It Yourself
Vitamin D3
1000 IU • Nature Made
Amlodipine (Norvasc)
Vitamin D increases calcium absorption, which may reduce effectiveness of calcium channel blockers.
Take 2+ hours apart →
Metformin (Glucophage)
No known interaction. Vitamin D may actually support glucose metabolism.
No action needed ✓
Atorvastatin (Lipitor)
High-dose Vitamin D (>4000 IU) may affect statin metabolism. Your dose (1000 IU) is within safe range.
Monitor if dose changes →
Who It's For
Built for the people who need it most
Personalized guidance for the communities most affected by supplement-drug interactions.
Older adult woman consulting with community pharmacist about her medications. Photo: National Cancer Institute / Rhoda Baer, public domain.
Older Adults (65+)
40% take 5+ medications alongside supplements
Managing multiple prescriptions is hard enough. Resin Health flags interactions your pharmacy might miss — in large text, plain language, with a reading level anyone can understand.
Margaret, 72
Takes amlodipine, metformin • 3 daily supplements
Pregnant woman smiling and talking to her doctor during a prenatal checkup. Photo: NICHD/NIH, public domain.
Prenatal & Postpartum
Prenatal vitamins are the #1 supplement category
Folic acid, iron, DHA — the stakes are higher when you're building a new life. Get NIH-sourced safety information for every ingredient in your prenatal.
Priya, 29
First pregnancy • prenatal + 2 additional supplements
For Every Community
Designed for everyone
Health information should be accessible to everyone — regardless of age, language, literacy, or connectivity.
WCAG AA Accessible
Large text defaults, high contrast ratios, full keyboard navigation. Designed for screen readers and motor impairments.
Bilingual EN + ES
Complete Spanish translation of all content, powered by NIH's own Spanish fact sheets. Not machine-translated.
Offline Capable
Progressive web app works without internet. Critical for rural clinics and areas with limited connectivity.
Plain Language
All content written at a 6th–8th grade reading level. Visual severity indicators reduce reliance on text.
Resin Health AI
Grounded in NIH data
Can I take Vitamin D with my blood pressure medication?
Based on NIH data, Vitamin D at standard doses (600–2000 IU) is generally safe with most blood pressure medications. However, if you take a calcium channel blocker like amlodipine, Vitamin D can increase calcium absorption, which may slightly reduce the medication's effectiveness.

Recommendation: Take them at least 2 hours apart and mention this to your healthcare provider.
Source: NIH ODS Vitamin D Fact Sheet • DailyMed Amlodipine SPL
What about my metformin?
Good news — there is no known interaction between Vitamin D and metformin. In fact, some research suggests Vitamin D may support glucose metabolism, which could complement your diabetes management.
Source: NIH ODS Vitamin D Fact Sheet (Professional)
Ask about your supplements...
AI-Powered Q&A

Ask anything about your supplements

Our AI chatbot answers questions in plain English, grounded exclusively in NIH Office of Dietary Supplements fact sheets. Every response includes citations so you can verify the source yourself.

Grounded in 100+ NIH ODS fact sheets
Every answer includes source citations
Personalized to your medications
No hallucinations — refuses to answer outside its knowledge
Try the Chatbot
Video Library
Learn in 60 seconds
AI-generated explainer videos personalized to your demographic. Each one grounded in NIH fact sheets.
Vitamin D video preview
1:09
Older Adults
Vitamin D: What You Need to Know
For adults 65+ managing bone health and chronic conditions.
Calcium video preview
1:07
Interactions
Calcium & Heart Medications
Why timing matters when you take both.
Omega-3 video preview
1:00
Heart Health
Omega-3: What You Need to Know Before Supplementing
Essential fats, food sources, and blood thinner interactions.
Iron video preview
1:00
Women's Health
Iron Supplements: Who Needs Them & How to Take Safely
Daily amounts, food sources, and drug interactions.
B12 video preview
1:00
Older Adults
Vitamin B12: Why Deficiency Is Common After 60
Signs, causes, and medication interactions like Metformin.
Magnesium video preview
1:00
Older Adults
Magnesium: The Mineral Most Adults Don't Get Enough Of
Daily needs, food sources, and interactions with osteoporosis drugs.

See it in action

Search Vitamin D, check drug interactions, ask a question, watch an explainer — all live, all powered by NIH data.

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