NutriStack
Certification
What “third-party tested” actually means
The phrase is unregulated. USP Verified, NSF Contents Certified, NSF Certified for Sport, Informed Sport and BSCG are not. What each mark verifies, and the public listing where you check it.
The parts of a supplement routine that are factual.
Certification marks, the Supplement Facts panel, the chemistry behind “more absorbable”, and why labels say “with food”. These pages answer questions that have real answers, and stop where the honest answer is that it depends on you.
The set
Five reference pages.
Each one is self-contained. None of them assume you have read the others.
Labels
How to read a supplement label
Serving size, %DV, why 400 mg of magnesium oxide is not 400 mg of magnesium, what a proprietary blend is allowed to hide, and the difference between a structure/function claim and a disease claim.
Chemistry
Supplement forms and bioavailability
What bioavailability measures, what the counter-ion does, elemental fractions and solubility across the common mineral salts and chelates, vitamin forms that genuinely differ, and how to read a “185x more bioavailable” claim.
Timing
Supplement timing: with food, and why
Micelle formation and why fat-soluble vitamins need a meal, gastric pH, competition between divalent cations, saturable absorption and split dosing, and the adherence variable that beats all of them.
Tools
How to choose a supplement tracker app
Reminder apps, catalog apps, web interaction checkers and stack trackers solve different problems. Nine questions that separate a tool that shows its work from one that shows you a number.
Scope
What is deliberately not here.
The line between reference and advice is the whole point of this section.
Out of scope
- Doses. How much of anything a particular person should take is a clinical question, and it depends on age, kidney and liver function, pregnancy, diet, and everything else already in the regimen.
- Interaction verdicts. NutriStack holds a per-pair interaction database, and it is excluded from search until it passes qualified clinical review. What is published instead is an attributed literature index.
- Separation intervals. How far apart to space a specific medication from a specific supplement is on that medication's label and belongs with the prescriber or pharmacist.
- Product endorsements. No brand is recommended here, and no manufacturer pays for placement anywhere on this site.
The app
Reference is the easy half.
The hard half is a routine you actually follow, and knowing what is in it. NutriStack organises the routine and shows the published record behind it.