Check the whole stack, not two at a time
Pairwise checkers make you run the same combination over and over. Pick everything you take and every pairing is scored at once — plus the three things a pair check cannot see: two products delivering the same compound, one mineral arriving from several sources, and clashing compounds sitting in the same time slot.
Your stack
Leave a slot on the first entry to skip it. Add one more each time you submit.
Common questions
How many supplements can you check at once?
Up to 10. Every combination is scored against every other one, so ten compounds produce forty-five pairings. Beyond that the matrix stops being readable.
What does the stack score mean?
It weights the worst pairing in your stack at 60% and the average of all pairings at 40%. One serious clash should pull the whole stack down, because that is how it works in practice — the rest of the combination does not compensate for iron and calcium cancelling each other out.
Does it check interactions with medication?
No. The score covers supplement-to-supplement records only. Documented medication interactions are listed on each compound page and are never folded into the number, because they need a clinician who knows your prescriptions.
What does it flag besides clashes?
Three things a pairwise check misses: two products delivering the same compound, the combined load of one mineral coming from several sources at once, and compounds that clash sitting in the same time slot.
Is "no documented interaction" the same as safe?
No. It means nobody has published a study on that pairing. Most combinations have never been tested, and absence of evidence is not evidence of absence.