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.
Grass-Fed Whey Protein Isolate
Add more (1/12)
Caution
8 · Combine carefully — read the noteCaution
Vitamin DGlucocorticoids (reduced vitamin D effectiveness)
Vitamin D: Glucocorticoids (reduced vitamin D effectiveness)
Known interaction
Caution
Vitamin DAnticonvulsants like phenytoin (increased vitamin D metabolism)
Vitamin D: Anticonvulsants like phenytoin (increased vitamin D metabolism)
Known interaction
Caution
Vitamin DOrlistat (reduced fat-soluble vitamin absorption)
Vitamin D: Orlistat (reduced fat-soluble vitamin absorption)
Known interaction
Monitor / Timing
3 · Usually fine — mind timing or watch for effectsMonitor / Timing
CalciumCertain antibiotics / thyroid / bone drugs
Calcium can bind these drugs and reduce their absorption.
Why: Cation chelation in the gut.
→ Separate calcium from these medications by 2–4 hours.
Curated
Monitor / 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
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.
