The front of a supplement bottle is marketing. The back is information. Once you know where to look, you can compare two products in about a minute — and you stop paying for the words on the front.
This isn’t health advice, and nothing here is about what a supplement will do for you — for that, talk to your healthcare provider. This is just how to read the panel.
Start with the serving size
Everything else on the label is “per serving,” so the serving size is the first number to check. Two products can look identical until you notice one is “per 2 capsules” and the other is “per 4.” A bottle with 120 capsules at 4 per serving is a 30-day supply, not 120 days. Always compare like for like.
The facts panel
This is the table that lists the actual ingredients and amounts. A few things worth knowing:
- Amount per serving — the real number, in mg, mcg, IU, or g.
- % Daily Value — roughly how a serving compares to a general daily reference. Helpful for context, but it’s a general guideline, not a personal target.
- The form matters — “magnesium” can mean several different compounds, for example. The specific form is usually named, and it’s a fair thing to compare between brands.
Look at the “non-medicinal ingredients”
Below the actives is a list of everything else — binders, fillers, coatings, and flavourings. There’s nothing inherently wrong with these; they hold a tablet together. But it’s the part of the label most people never read, and it’s where products genuinely differ. A shorter, more recognizable list is a reasonable thing to prefer.
In Canada, find the NPN
Here’s the piece that’s specific to us. Licensed natural health products sold in Canada carry a Natural Product Number (NPN) — an eight-digit number that means Health Canada has reviewed the product. You can look an NPN up in Health Canada’s Licensed Natural Health Products Database to confirm it’s a real, licensed product. If you can’t find an NPN on a product being sold as a supplement in Canada, that’s worth a pause.
A quick checklist
When I’m comparing two bottles, I look at:
- Serving size — and how many days the bottle actually lasts
- The active amounts, per serving, in the same units
- The form of each ingredient
- The non-medicinal ingredient list
- An NPN you can verify
That’s it. The front of the bottle is welcome to be pretty; the back is where you decide.
If you’d like a hand comparing a couple of options, the nutrition products I carry all list their details, and you’re always welcome to message me to talk it through. As always, check with your healthcare provider before starting anything new, especially if you’re pregnant, nursing, or taking medication.