PharmaGuideThe supplement & medication co-pilot
Know what you're taking.
Understand how it works together.
Scan a supplement to understand its ingredients, quality, and evidence. Check for ingredient overlap and documented concerns based on your other supplements, medications, and health conditions.
iPhone & Android · Basic use is free forever · All available features included during beta.
Example: adding a calcium and vitamin D3 supplement (a sample product, shown with an illustrative quality score of 88) to a stack with levothyroxine flags a timing issue — separate them by at least 4 hours. A multivitamin, vitamin D3 and cod liver oil together total about 6,000 IU of vitamin D a day, above the adult upper limit of 4,000 IU.
Every claim traceable to sourceClinician-reviewed contentYour health profile is stored on your device
How it works
One scan. Three answers.
A label tells you what's in the bottle. PharmaGuide checks what it can't.
01 · Quality
Is the product any good?
88
Very good · Sample product, illustrative score
- Formulation
- Dose
- Evidence
- Transparency
- Testing & Brand
- Formula & quality checks
Googling “X with Y” usually gives you three different answers. Here, every finding shows its evidence and its source. Reviewed by Laurie Pham, PharmD. Read the methodology →
4,100+ ER visits a day from adverse drug events, most of them from prescription medicines; supplements are a smaller, separate estimate. Not all interactions require emergency care. Source: CDC ↗
The ladder
Five levels. One clear next step.
Every finding lands on one of five levels, with the reason, the evidence behind it and what to do.
When evidence is incomplete, we say so directly.
Tap a level to see an example ↓Click a level to see an example →
5-HTP + an SSRI antidepressant
5-HTP is turned into serotonin, and SSRIs keep serotonin active for longer. Together they can raise serotonin activity enough to contribute to serotonin syndrome.
What to do: Do not take them together, and do not stop or switch your antidepressant to use 5-HTP. Your prescriber plans any change.
Evidence
Established
Health Canada 5-HTP monograph
St. John's wort + apixaban
St. John's wort speeds up the pathways that clear apixaban and similar blood thinners, lowering drug levels and protection against stroke or clots.
What to do: Avoid combining unless your prescriber explicitly manages it.
Evidence
Established
FDA drug labeling
Calcium + levothyroxine
Calcium binds levothyroxine in the gut and reduces how much is absorbed when the two are taken together.
What to do: Separate doses by at least 4 hours. Take levothyroxine on an empty stomach.
Evidence
Established
Multiple controlled studies · FDA-labeled
CoQ10 + warfarin
The warfarin label lists CoQ10 among products that may reduce warfarin's effect. Clinical evidence is mixed.
What to do: Tell your anticoagulation team before you start, stop or change CoQ10, so they can decide whether your INR needs extra checks.
Evidence
Probable
FDA drug labeling · mixed clinical studies
L-theanine + blood-pressure medicine
L-theanine has blunted short-term rises in blood pressure in small studies. Those studies do not establish a harmful interaction with blood-pressure medicines.
What to do: Mention L-theanine to your prescriber. Nothing else to do.
Evidence
Theoretical
Small human studies · animal data
Beyond interactions
Interactions are just the start.
Four more things PharmaGuide checks that no single label can show you.
- MetforminVitamin B12
Lower levels more likely, long-term
Medication depletion
See how - Vitamin D across 3 products6,000 IU
Adult upper limit 4,000 IU
Nutrient accumulation
See how - Magnesium glycinate200 mgProprietary blend · 3 herbs850 mg
Amount of each herb not disclosed
Ingredient transparency
See how FDA recall · class I · sample
NaturalBoost Energy — undeclared sildenafil
Recall + safety alerts
See how
Built for real life
The moments people don't realize they need this.
From morning prescriptions to trending supplements, PharmaGuide catches the combinations people usually miss.
The prescription you've taken for years
Significant · Metformin → Vitamin B12
Pregnancy changes more than your routine
Contraindicated · Vitamin A over 10,000 IU
When your doctor adds something new
Avoid · St. John's Wort + Sertraline
Your gym stack, all together
Monitor · Turmeric + Ibuprofen
The supplements your parents take now
Caution · Ginkgo + Aspirin
Healthy can still overlap badly
Monitor · Multiple magnesium sources
The recall you'd never have heard about
Avoid · Undeclared sildenafil
Safe for most — not for your profile
Caution · Potassium + kidney diseaseFrom the research desk
What the evidence actually says.
Plain-language guides to the research behind common supplement and medication questions — every claim cited, every article dated and signed.
All articlesJoin the founding testers.
We're adding founding testers by hand. Join the list for an invitation when a place is available. Your feedback will help us find what needs work.
Free during betaNo credit cardWe never sell your health data
Questions about privacy, pricing or a product we don’t have yet? Read the FAQ →
Inside the beta
- 01
Scan & search
Scan a barcode or search for a supplement. Check that the product and label match what you have.
- 02
Verdicts with reasoning
Review product information and interaction warnings. Available details depend on the product and the evidence behind the result.
- 03
Personal Fit
Your profile and the details you enter help put results in context. Coverage varies, so bring questions to your pharmacist or clinician.
+ everything that ships at launch