Trust tool
Supplement stack daily cost
Add every supplement in your routine to see the real combined cost per day and per year, the number most people never total. The tool also flags overlaps, where the same nutrient appears in more than one product, which waste money and can push you toward the upper safe limit. Cost is only part of the picture; whether you need each item is the bigger question. Information only, not medical advice.
How the calculation works
For each supplement, cost per day is the pack price divided by the number of days the pack lasts. We total those for a combined daily figure and multiply by 365 for the annual figure. The main nutrient you pick for each row is used only to detect overlaps; if the same nutrient appears twice, or a multivitamin sits alongside a single nutrient, we flag it. Nothing you enter leaves your browser.
Information only, not medical advice. This tool is educational and is not a substitute for a registered clinician. It does not diagnose anything and does not recommend that you take any supplement. Always read product labels and speak to your GP or pharmacist before starting, stopping or combining supplements. If an overlap could push your intake high, use the upper safe limit checker and speak to your pharmacist; some nutrients, such as vitamin A and iron, are easy to over-take across products.
Read more
Check each item is worth taking with do you actually need this supplement, check totals against safe limits with the upper safe limit checker, and price each product with the cost per effective dose calculators. More on the tools hub.
Frequently asked questions
How does the stack calculator work?
Add a row for each supplement with its pack price and how many days the pack lasts you. The tool divides the price by the days to get a cost per day for each, then totals them for a daily and an annual figure. It is the number most people never add up, and it is often a surprise.
What is an overlap flag?
It is a warning that the same nutrient appears in more than one product in your stack, for example a standalone vitamin D plus a multivitamin that already contains vitamin D, or two products both providing magnesium. Overlaps waste money and can push your total intake toward the upper safe limit, so the tool flags them so you can drop a duplicate or check the combined dose.
Why flag a multivitamin?
A general multivitamin overlaps with almost any single-nutrient supplement, because it contains small amounts of many nutrients. If you take a multivitamin and several singles, you are often paying twice for the same nutrients, and you may exceed an upper limit. Use the upper safe limit checker to add up the same nutrient across products.
Does a lower total mean my stack is right?
No. Cost is only one part. A cheap stack of supplements you do not need is still wasted money, and the bigger question is whether each item is justified at all. Pair this with the do you actually need this tool, and with your GP or pharmacist for anything you are unsure about.
Editor, Her Vitals
Oliver leads Her Vitals's editorial coverage of women's life-stage health and supplements. He curates and reviews existing branded products across trying to conceive, pregnancy, postnatal, perimenopause, menopause and the senior years, weighing what the evidence supports against guidance from bodies such as EFSA, the NHS and NICE, and is clear that the content is information rather than medical advice.
Last reviewed: 13 June 2026