Editorial and sourcing policy
Where our rules come from, which text is AI-written, how a mistake is corrected, and what we do not check.
Where our rules come from
Your list check runs on a fixed set of interaction rules. No AI runs when you check your list. The rules themselves are drafted with the help of AI tools, most of them from an FDA drug label or another named source, such as a National Institutes of Health fact sheet or a published study. New and changed rules are checked against those sources in separate reviews, which also use AI tools, and approved by us before they go live. Many warning cards name their source in their own words (for example, “The Adderall XR prescribing information lists …”). Some older warnings name no source on the card. The sources are kept as notes beside most rules in our code. A checked list of the label sentence and the link behind every rule is not finished, and showing them on every card and every guide is not done yet.
Our rules and our pages are not reviewed by a pharmacist or a doctor, and nothing on this site is medical advice. For anything you take, ask the pharmacist or prescriber who manages it.
Our method is published on How we score, with the size of every reference file we use.
Which text is AI-written, and how it is marked
Your list check uses no AI. The public guides under Supplement stack guides carry an analysis that a language model drafted ahead of time from two ingredient names and no one's data. Where that text is on a page, the page says it is AI-written and gives the day it was generated. Our interaction rules can add a warning to it. Where no rule of ours matched the pair, the page says the text is not checked against a rule.
The verdict at the top of a guide is not the AI's. It is what our own check says about that pair: a Major or Moderate warning, a worth-spacing note or a blood-test note, in the words your list uses, or “No rule matched” where your list would show no card. “No rule matched” means only that none of our rules covers the pair. It does not mean nothing happens. A guide takes no verdict from the AI-written analysis, and shows no score.
How corrections are made and dated
A mistake we find is corrected the same way a rule is made. The eleven guides we corrected on 4 November 2026 against the drug labels, NIH pages and published studies say so on the page, with the day. The same day is the page's modified date in its structured data. On five other guides we took out AI-written sentences that were about the wrong ingredient; those pages carry no note yet. Changes to how every guide is drawn are not noted on each page.
- A rule that turns out to be wrong is changed in the rule file, and every page and list check then reads the corrected rule.
- A report that turns out to be right gets the file changed. We read every report.
What we do not check
Two medications are checked against each other only where one of our rules covers that pair; any other pair of entries we read as medications is for your pharmacist. So is any pair we found no warning in but do not count as checked, either because a medicine's label warns about a whole group of products, because our rules cover almost none of one side's pairs, or because our rules cover only some of what alcohol or grapefruit does with medicines. Many supplements are named by none of our rules, so their pairs count as checked with no warning. No warning means only that none of our rules matched that pair. A compound we do not rate, and most entries on the list we cannot identify, are marked Not rated; a misspelled name can instead count as checked with no warning, so spelling matters.
The full list of limits is on How we score.
Report an error
Every guide ends with a “Report an error” link that writes to support@canistackthis.com with the guide's address in the subject. You can also use the contact form. Say what you believe is wrong and, if you have one, send a source.
Who is behind this
CanIStackThis is made by CanIStackThis LLC, a company registered in Florida. It sells no supplements, runs no ads and takes no affiliate commissions. More on the About page.