Supplement Basics
How to Read a Supplement Label (What the Numbers Actually Mean)
I used to skim right past the Supplement Facts panel like it was fine print. Once I learned what it was actually telling me, I never shopped for a supplement the same way again.
By Mary Smith · Updated this month · 5 min read
Every bottle has one, and most of us glance at it for about two seconds before looking at the price. That's a shame, because the Supplement Facts panel is actually the most honest part of the whole package — it's legally required to be accurate, unlike marketing copy on the front of the box.
Serving size is the first thing to check
Every number on the label is "per serving" — and serving size varies wildly between products. Some list amounts per capsule, others per 2-capsule serving, others per dropper or scoop. Two products can look similarly dosed at a glance but differ by half if one lists a 1-capsule serving and the other lists a 2-capsule serving. Always check servings per container too, so you know how long a bottle will actually last you.
% Daily Value — and when you won't see one
For nutrients with an established recommended daily intake (most vitamins and minerals), labels show a "% Daily Value" — how much of your daily need that serving provides. For ingredients without an official established daily value — which includes most herbal extracts and many specialty ingredients — labels typically show a dagger symbol (†) instead, meaning "daily value not established." That's not a red flag by itself; it just means science hasn't set an official reference amount for that particular ingredient yet.
A "proprietary blend" lists a total combined weight for several ingredients together, without breaking out how much of each individual ingredient is actually in it — that's worth knowing before you compare products by "the ingredients are the same."
The "proprietary blend" question
Some labels list a group of ingredients as a "proprietary blend" with one total weight, rather than breaking out each ingredient's individual amount. This is legal, and companies sometimes do it to protect a specific formula ratio — but it also means you can't tell if the beneficial ingredient makes up most of the blend or just a token amount. Labels that disclose the individual dose of each ingredient are giving you more actual information to evaluate.
"Other ingredients" isn't filler in the negative sense
The "other ingredients" section lists things like the capsule material, binders, or preservatives — necessary for the product to exist in its physical form, not necessarily something to be suspicious of. It's worth scanning this section specifically for allergens (some capsules are derived from shellfish, for example) rather than assuming it's unimportant.
A quick checklist for next time
- Check the serving size before comparing doses between products
- Look for individually disclosed ingredient amounts rather than a vague "blend"
- Scan "other ingredients" for allergens relevant to you
- Remember that † just means no official daily value exists yet — not that the ingredient is unproven