How to Compare Supplement Prices: Cost per Day, Not per Bottle
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Two bottles can have the same capsule count and very different running costs. The useful comparison is the cost of the label's daily serving, alongside what that serving actually contains.
Use two simple calculations
Days per bottle = capsule count ÷ capsules per day.
Cost per day = bottle price ÷ days per bottle.
A worked example
These are fictional products, not By Nature prices or suggested doses.
| Example | Bottle price | Capsules | Label serving | Days | Daily cost |
|---|---|---|---|---|---|
| A | £30 | 60 | 2 per day | 30 | £1.00 |
| B | £42 | 90 | 1 per day | 90 | About £0.47 |
B costs less per day in this example. That does not establish that its formula is equivalent or more effective.
Compare the same kind of ingredient
Put finished extract amounts beside finished extract amounts. Keep raw-material-equivalent figures in a separate column. Record the species or botanical name, extract specification and any declared marker before deciding that one bottle gives you more.
Include the cost of the order
Delivery charges and discounts can change the calculation. Work from the total you would actually pay, in one currency. For a bundle, check whether you want every item rather than treating an unwanted product as a saving.
When does a bigger bottle make sense?
It is worth considering when the formula suits your needs, the per-day saving is real and you can use it within the labelled shelf life. Buying several months upfront solely to unlock a discount can be poor value if you later decide the product does not fit your routine.
Keep a four-column shortlist: product, relevant specification, daily cost and unanswered questions. That makes value much easier to judge.