Supplement labels use precise-sounding words with very little regulation behind them. These are the terms worth understanding, and each links to where we cover it.
The named compounds that recur, and what the form on the label changes.
An essential mineral sold in many chemical forms, which differ substantially in how much is absorbed and how well tolerated they are. A magnesium dose on a label is close to meaningless without the form, and the form is where most of the practical difference sits.
Where we cover itMagnesium bound to the amino acid glycine, one of the better tolerated forms. The binding matters because the elemental magnesium delivered per gram of compound differs by form, so two products showing the same milligram figure can deliver different amounts.
Where we cover itOne of the most studied sports supplements, usually sold as creatine monohydrate. It is unusual in this category for having a large and consistent evidence base behind a narrow, well-specified claim.
Where we cover itA milk-derived protein, sold as concentrate, isolate or hydrolysate. The forms differ in protein share and lactose content rather than in kind, which is what the price gap between them is actually buying.
Where we cover itA botanical used in traditional medicine and marketed for stress. Extract standardisation varies enormously between products, so two bottles naming the same herb are frequently not comparable preparations.
Where we cover itThe main active constituent of turmeric, notable for poor absorption on its own. This is why formulations add absorption enhancers, and why the total curcumin figure on a label is a weak guide to what is delivered.
Where we cover itLegal status in this category is layered and local, which is the part most coverage gets wrong.
The rules governing what may be sold, how it may be described and to whom. Supplements are regulated differently from drugs: they generally do not require pre-market approval of effectiveness, which is the single most important fact about the category.
Where we cover itMinimum-age rules on purchase, set by state and sometimes by municipality rather than nationally. They differ between substances and between neighbouring jurisdictions, so a national statement about an age limit is usually wrong somewhere.
Where we cover itCity and county governments, which in this area frequently legislate independently of their state. It is why a substance can be lawful statewide and prohibited in a particular city, and why state-level answers are incomplete.
Where we cover itA botanical whose legal status varies by state and by municipality, with active legislation in both directions. It is the clearest illustration in this category that legal status is a local question with a moving answer rather than a national fact.
Where we cover itA botanical used traditionally in the Pacific, with legal treatment that differs between countries and has changed over time. Like kratom it is a case where the international picture and the domestic one diverge.
Where we cover itA controlled substance federally, with a small number of states and cities having changed their local treatment. The divergence between federal and local law is the entire story, and local change does not alter federal status.
Where we cover itBecause effectiveness is not pre-approved, verification is what separates products.
Independent third-party certification that a product contains what it claims and is free of specified contaminants. It verifies CONTENTS, not effectiveness, and in a category without pre-market approval that distinction is the most useful one on a label.
Where we cover itMarketing aimed at competitors, which carries a real technical meaning: people subject to anti-doping testing need certification against banned substances, because contamination rather than intent is the usual route to a failed test.
Where we cover itPairs that appear on the same label or in the same law and mean different things. Each distinction changes what you are actually looking at.
Magnesium is the mineral; glycinate is one chemical form of it. The form determines how much elemental magnesium a gram of compound delivers and how well it is tolerated, so two products showing the same milligram figure can deliver quite different amounts. A dose without a form is not a specification.
Where this bitesSupplement law sets what may be sold and said; it generally does not require anyone to prove a product works before selling it. NSF certification is voluntary third-party verification that the contents match the label. Neither establishes effectiveness, and only the second establishes contents.
Where this bitesAge restrictions are the rule; municipalities are one of the levels that can set it. Because cities legislate independently of states in this area, an age limit can differ between two towns in one state, which is why national statements about age limits are usually wrong somewhere.
Where this bitesBoth have legal status that varies locally and both are frequently discussed together, but the structure differs: psilocybin is federally controlled with some local change that does NOT alter federal status, while kratom is not federally scheduled and is regulated state by state. Same-sounding situation, different legal architecture.
Where this bitesWhey is a protein source, a food ingredient supplying amino acids. Creatine is a specific compound with a narrow, well-evidenced role in short-duration performance. They are sold side by side and often bundled, and they are not alternatives to one another in any sense.
Where this bitesAthlete is marketing language; certification is a verifiable fact. For anyone subject to anti-doping testing the certification is the part that matters, because failed tests usually come from contamination rather than intent, and a product branded for athletes is not thereby tested for banned substances.
Where this bitesThis is educational information about how these terms are used, and it is not medical advice, not a recommendation to take anything, and not a statement that any substance is safe or legal for you. Supplements interact with medications, legality differs by state and municipality, and rules change. Talk to a qualified professional before taking anything.