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Supplement Cost Per Day: How to Compare Fairly
To compare supplements fairly, divide the total you pay, including shipping, by the number of days the product lasts at the label dose. Bundles lower the daily cost but raise the amount you commit up front. A low daily price does not make a product worth buying if the evidence for benefit is weak.
Written by the Prostadine label deskUpdated · 4 min read
The basics01
The formula
Cost per day equals the total paid, including shipping and tax, divided by the number of days the purchase lasts at the label dose. It is simple and it removes most of the sleight of hand from price tags.
Use the dose in the label, not the dose in the advert. If a bottle holds 30 servings and you take one a day, it lasts 30 days. If you take two a day, it lasts 15, and the price per day doubles.
The evidence02
A worked example from a product we review
| Pack | Total | Per bottle | Per day (30-day bottles) |
|---|---|---|---|
| 2 bottles | $158 plus $9.99 shipping | $79 | $2.63 |
| 3 bottles | $207, free US shipping | $69 | $2.30 |
| 6 bottles | $294, free US shipping | $49 | $1.63 |
The numbers03
Reading the example
The per-day figures in the table come from dividing the bottle price by 30 and ignore the $9.99 shipping on the smallest pack. With shipping, two bottles cost slightly more per day than the table shows. The six-bottle pack is the cheapest per day and also the biggest outlay up front, and a 60-day return window applies to all packs.
That outlay is the point to weigh. A lower daily price is a saving only if you will actually use the product for six months.
The catch04
Traps in pricing
- Free bonuses that are digital guides add no physical product.
- Free shipping on large packs may hide a higher base price.
- Auto-ship offers can bill you again, so read the terms.
- A crossed-out price may never have been charged.
- Currency and fees can alter the total for overseas buyers.
For the brand we review, we found no subscription, but the checkout is the place to confirm it on the day you buy.
Safety05
Cost against evidence
Price is only half of value. A product that costs less per day but has no evidence of benefit is not a bargain. A generic prescription drug may cost less per day than a supplement and has trial evidence behind it, as discussed in our post on herbal versus prescription options.
Ask your pharmacist for the actual price of a generic before assuming that natural means cheaper.
What to do06
Overseas buyers and hidden costs
Buyers outside the United States face extra costs that a per-bottle price hides. The seller lists a shipping fee of $15.95 for Canada, the United Kingdom, Ireland, Australia and New Zealand, and local taxes, duties or card fees may come on top. Delivery times are longer too, and a slow parcel eats into a 60-day window that starts at the order and not at the arrival.
Put these costs in the formula before you compare. A pack that looks cheap per day for a US buyer can look quite different when shipping and fees are added for a buyer elsewhere. For the product we review, see the shipping page for what we found.
Keep a copy of the delivery date as well. If a parcel arrives late, you will want the evidence when you decide whether a test is still practical inside the window.
On the label07
Setting a budget
Decide in advance what you will spend on a trial and for how long. A 60-day window means you only need two bottles of a 30-day product to test it fully. Buying six at the start commits you beyond the test.
If the test does not show a benefit, you can still claim a refund within the window, but you pay return postage and wait several days for the money. Those costs belong in the calculation too.
In practice08
A short routine
- Write the dose and the days per bottle.
- Add shipping and any fees.
- Divide to get the per-day price.
- Note the return window and who pays postage.
- Compare with the cost of a doctor visit and a generic drug.
See our pricing page and the cost per day post for the full working on the product we review.
FAQ09
Prostadine questions people ask
How do I calculate supplement cost per day?
Add shipping and fees to the price, then divide by the number of days the purchase lasts at the label dose.
Is a bigger bundle always cheaper?
Per day, usually yes, but it commits more money before you know whether the product helps.
Should I include shipping?
Yes. It changes the real cost, especially on small packs.
Is the cheapest option the best value?
Not if the evidence for benefit is weak. Compare with other options, including generic medicines.
Who wrote this10
Written and reviewed by
Pages built from the bottle photos, the info page and linked NIH, FDA, NCI, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a licensed U.S. retail desk for Prostadine, not by the manufacturer. We earn money when you buy through our order links.
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