About StackCheck

A Timing Tool, Not a Store

StackCheck takes the supplements you already take and builds a daily schedule: what to take together, what to separate by hours, and what to shift earlier or later. The tool covers 124 supplements and analyses every pairwise interaction in your stack.

Alongside the tool, we publish a small library of research-backed guides on the interactions we see most often - vitamin D timing, magnesium and zinc competition, the calcium-iron block, and the D3–magnesium cofactor relationship.

No Manufacturer Ties

StackCheck is not owned by, sponsored by, or paid by any supplement brand, retailer, or manufacturer. We do not sell supplements. We do not earn affiliate commissions on the products we mention. When a guide names a form of a nutrient (for example, "magnesium glycinate" or "vitamin D3 from lichen"), the reason is absorption or suitability, not a commercial relationship.

Our revenue comes from users who upgrade the StackCheck tool for advanced features. That is the only financial relationship in the loop.

Editorial Team

Editorial content is produced and reviewed by the StackCheck editorial team. We are a small independent group; we do not claim medical credentials. When we cite a mechanism, dose, or outcome, we link to the primary source - typically a PubMed-indexed study or a research monograph on Examine.com - so you can check the evidence yourself.

For a more detailed explanation of how we source, review, and update each claim, see the methodology page.

Scope and Limits

• Not medical advice. StackCheck provides general information about supplement timing and absorption. It does not replace individual advice from a qualified clinician.
• Not a diagnostic tool. We do not identify deficiencies or recommend doses for conditions.
• Not a prescription-drug interaction checker. The database covers common supplements. If you take prescription medication, speak to your pharmacist or prescriber.
• Not FDA-reviewed. Supplement statements on StackCheck have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease.

We Fix Mistakes Quickly

If you find a factual error, an outdated citation, or a broken link, please tell us. We treat editorial corrections as a first-class priority and update the affected page with a visible "Last reviewed" date whenever substantive changes are made.

Reach out through the contact page or directly via the feedback form.

Try the Tool

The editorial content on this site is the background reading. The tool is where you put your own stack in and get a personalised schedule.

Analyze Your Stack →