Interaction Checker
Check interactions
Add your supplements, foods, meals — and any medications you take — to see how they interact. Findings are grouped by severity: what to avoid, what needs care or timing, and what actually works better together.
Blood Builder
Add more (1/12)
Caution
7 · Combine carefully — read the noteCaution
Vitamin B12 (Cobalamin)Metformin reduces absorption
Vitamin B12 (Cobalamin): Metformin reduces absorption
Known interaction
Caution
Vitamin B12 (Cobalamin)PPIs reduce absorption
Vitamin B12 (Cobalamin): PPIs reduce absorption
Known interaction
Monitor / Timing
1 · Usually fine — mind timing or watch for effectsMonitor / Timing
IronThyroid / certain antibiotics / Parkinson's drugs
Iron can bind these drugs and reduce their absorption.
Why: Cation chelation in the gut.
→ Separate iron from these medications by 2–4 hours.
Curated
Works well together
3 · Beneficial pairingWorks well together
Folate pairs well with Vitamin B12 (Cobalamin).
Stacking note
Works well together
Vitamin B12 (Cobalamin) pairs well with Iron.
Stacking note
Not medical advice. This tool surfaces well-established and known interactions from our reference data and curated rules. It is not exhaustive, can’t see your full health picture, and an absence of findings does not mean a combination is safe. Always consult a doctor or pharmacist about your supplements and medications.
