Calcium and iron interact because they compete for the same intestinal transporter, so take them at least two hours apart. StackingRight checks every pair in your stack for that kind of conflict — across 91 sourced rules covering nutrients, medications and foods — and shows the severity, the mechanism, the spacing required and the citation for each one.
2 items selected
Medications and foods are included — they matter as much as supplements.
Sets the daily recommended intake used to judge your totals. Upper intake levels are the same for both sexes.
Solid
Mostly clean. A few timing or overlap issues to tidy up.
Hover a node to isolate its relationships.
Nutrient interaction
Calcium and non-heme iron compete for the same divalent metal transporter (DMT1) in the small intestine. Calcium also inhibits iron absorption directly, and the effect is proportional to dose.
Separate calcium and iron by at least 2 hours. Take iron on an empty stomach with vitamin C, and calcium with a meal later in the day.
Everything these products supply, against your daily targets.
Each item placed in the window its absorption requires.
2 items ready to place across 2 windows.
An account keeps your stack, tracks what you actually took, and recomputes your score as your labs and medications change. The scan itself stays free.
Avoid the combination or separate by the full interval. Worth a prescriber conversation.
Every flagged pair gives you four things: how serious it is, why it happens physiologically, how many hours apart they need to be, and what to actually do. No black boxes.