Which supplements do something, which do not, and how to tell

Supplements are where a lot of returning trainees spend their first hundred kronor and most of their attention. The category is confusing on purpose. Here is a way to think about it that does not require you to trust anyone's marketing, including ours.

Start with the order of operations

Supplements are the last variable, not the first. Training that happens, sleep, total food and protein all sit above them, and the gap is not close. If those four are unsettled, a supplement is a rounding error you paid for. That is not a moral position, it is arithmetic.

How to read a label without being sold to

Three questions handle most products. What is actually in it, in what dose, and compared to what?

The first is answered by the ingredient list, not the front of the tub. The NIH Dietary Supplement Label Database records what supplement labels actually declare, ingredient by ingredient, which is a useful reality check against a brand's own description of its product.^{Source 2}

The second is the one that catches people. A blend can contain an ingredient that has been studied at a meaningful dose while providing a fraction of it. If the label lists a proprietary blend without per-ingredient amounts, you cannot answer the dose question at all, which is generally the point of a proprietary blend.

The third is where EU labels help. Vitamin and mineral contents on an EU label are expressed against nutrient reference values set in Regulation (EU) No 1169/2011, so a percentage on the box has a defined meaning rather than being a number a brand chose. A product supplying several hundred percent of a reference value is not automatically better, and for some nutrients it is a reason to look more closely.^{Source 1}

The honest categories

Things that are mostly food in a tub

Protein powder is the clearest example. It is a convenient way to eat protein, and that is the whole claim. If you struggle to get protein into a working day, it solves a logistics problem, which is a real problem. It is not a training supplement in any interesting sense.

Things that address a shortfall

Some nutrients are supplemented because intake or exposure is genuinely low for a given person or population, and the reference values on the label are the yardstick for what a dose means. This category is worth a conversation with a clinician or a blood test rather than a guess, because the useful answer depends on you.^{Source 1}

Things that promise a transformation

Fat burners, testosterone boosters, recovery blends with a long ingredient list and short doses. The tell is usually the same: the marketing describes an outcome, the label describes a mixture, and no part of the packaging connects the two with a number you can check.

Four questions before you buy anything

• What specific problem is this solving, in one sentence, without using the word optimise?
• What dose of the active ingredient does it provide per serving, and does the label state it?
• Would fixing sleep, protein or attendance solve the same problem for nothing?
• If it works, how would I actually know within eight weeks?

That last question is the most useful one, and it eliminates a lot of purchases. If there is no observable difference you could point at in two months, you are buying a feeling.

Interactions and conditions

Supplements are not inert simply because they are sold without a prescription. Some interact with common medications, and some are relevant to conditions you may already be managing. If you take anything regularly, the correct move is a pharmacist or a doctor, not a forum.

What Amble does here

Amble presents supplement doses against the EU reference values and checks what a product declares against the NIH label database rather than against its own marketing. Where the honest answer is that something is unnecessary for you, the plan says so instead of listing it anyway. The app is in development and the beta opens soon.^{Source 1,2}

This is general information, not medical advice, and it is not a recommendation to take or avoid any particular product.