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Supplements · lesson 11 of 11

Reading a label & spotting junk

Proprietary blends, fairy dusting, fillers, % daily value, third-party seals, and marketing red flags.

6 min read · reviewed October 2026

This lesson pulls the whole track together into a practical skill: picking up any bottle and judging it in under a minute. The front of the label is marketing; the Supplement Facts panel on the back is the truth. Learn to read the panel, ignore the front, and most junk products give themselves away instantly.

You already have the pieces — form (L2), dose (L3), evidence (L4), testing (L5). This is how to apply them at the shelf.

Anatomy of the Supplement Facts panel

Serving size & servings per container

Everything else is 'per serving.' If serving size is 3 capsules and you take 1, you get a third of the listed amounts (Lesson 3). Also tells you how long a bottle really lasts — a 'great deal' with a tiny serving may be costlier per day.

Each ingredient + its exact amount

Good labels list every active ingredient with its specific dose and form (e.g. 'Magnesium glycinate 200 mg'). This is what lets you check dose against the evidence. A panel that hides individual doses is hiding something.

% Daily Value (%DV)

How much of the official daily reference a serving provides. Useful for vitamins and minerals to gauge whether a dose is trivial or substantial — but %DV is a deficiency-prevention floor, not an optimal dose, and many ingredients (botanicals, creatine) have no %DV at all.

'Other ingredients' (the fillers)

Binders, flow agents, capsule material, sweeteners, colors. A few are normal and harmless; a long list of dyes, fillers, and sweeteners on a simple product is a quality red flag. This is also where allergens and additives you may avoid show up.

Key concept

Proprietary blends hide fairy dusting

A proprietary blend lists several ingredients under one combined weight instead of disclosing each dose. That single number can't tell you whether the good ingredients are at clinical levels or fairy-dusted — present in token amounts just to appear on the label (often by listing the cheap, heavy ingredient first and the expensive active last). When you can't see each dose, assume the worst and choose a fully-disclosed product instead.

Make a guess

A '1,500 mg Energy & Focus Blend' lists, in order: rice flour, caffeine, taurine, and a trendy adaptogen. The expensive adaptogen is listed last. Roughly how much of that 1,500 mg is likely the adaptogen?

Somewhere between 0 and 1,500 mg.

Reveal the answer →

Likely a tiny fraction — fairy dust

Ingredients are listed by weight, high to low. With cheap rice flour and caffeine first and the costly adaptogen last in an undisclosed blend, the adaptogen is almost certainly a token amount — far below any studied dose. The blend exists to list the trendy ingredient, not to deliver it. This is fairy dusting in plain sight.

60-second junk detector

  • Flip to the Supplement Facts panel — judge the back, not the front.
  • Are individual ingredient doses disclosed? A 'proprietary blend' with one combined weight is a red flag.
  • Do the key doses match the studied amounts (Lessons 3 & 7)? Under-dosed = fairy dust.
  • Are the forms good (chelated minerals, methylated B's, standardized extracts)? (Lessons 2 & 8.)
  • Is there a third-party seal (NSF, USP, Informed Sport) or a published COA? (Lesson 5.)
  • Is 'Other ingredients' short and clean, or a wall of dyes, fillers, and sweeteners?
  • Be wary of marketing red flags: 'miracle,' 'detox,' 'clinically proven' with no citation, '#1 doctor recommended,' celebrity endorsements, before/after photos, and proprietary 'secret' formulas.
Check yourself

Two pre-workouts. A discloses every ingredient and dose, has an NSF seal, and a short filler list. B has a '6,000 mg proprietary blend,' a celebrity endorsement, and 'clinically proven' with no study cited. Which is the better buy?

  1. B — the bigger blend number means more actives
  2. A — full dose disclosure, third-party tested, clean label
  3. Whichever is cheaper per serving
  4. Can't tell without trying both
Show the answer →

B.A — full dose disclosure, third-party tested, clean label

Product A lets you verify exactly what you're getting, is independently tested, and isn't hiding behind a blend or unsupported claims. Product B's big blend number is meaningless without per-ingredient doses, and 'clinically proven' with no citation plus a celebrity is pure marketing. Transparency and testing win.

Try it in the app
Compare products on dose, form, and testing

Formulate scores every product on dose, form, evidence, and quality — so the proprietary-blend and fairy-dusted ones are easy to spot and skip.