Methodology
Where the numbers come from
Each product has one data file. Serving size, protein, calories, carbohydrate, sugar, fat, sodium, sweeteners and servings per container are copied from the product label for the flavor listed as "flavor tested". Other flavors of the same product can have different labels.
Everything on a product or comparison page is generated from that data file. If a detail is not in the file, the site does not state it.
Prices
The price is what the linked retailer listed for the container size shown, on the "price checked" date displayed next to it. Prices change often, so check the retailer for the current price. Every cost figure on this site is calculated from that dated price.
How the metrics are calculated
| Metric | Formula | What it tells you |
|---|---|---|
| Protein share of serving | protein per serving (g) ÷ serving size (g) | How much of each scoop, by weight, is protein according to the label. |
| Cost per serving | price (USD) ÷ servings per container | What one label serving costs at the checked price. |
| Cost per 25 g protein | cost per serving ÷ protein per serving (g) × 25 | Cost for the same amount of protein, so products with different serving sizes can be compared. |
| Calories per g protein | calories per serving ÷ protein per serving (g) | Label calories for each gram of label protein. |
If a figure needed for a calculation is zero, the metric is shown as "n/a" instead of a number. On comparison pages, costs per 25 g of protein are compared after rounding to the cent, so two products that round to the same amount are reported as costing the same.
What "tested by me" means
"Tested by me: yes" means I personally mixed and drank the product in the flavor listed as "flavor tested". The taste and mixability notes on those pages are my own subjective impressions of that flavor.
"Tested by me: no" means I have not tried the product. Its page shows label facts, price and computed metrics only, with no taste or mixability notes.
I do not lab-test products. Label figures are reported as printed and are not independently verified by me.
Third-party testing
The "third-party tested" field records which certification programme, if any, is recorded in the product's data file: Informed Sport, NSF, or other. "None" means the product is recorded as not third-party tested. "Not stated on label" means the label I read does not mention a programme either way.
Affiliate links
"Buy" links may be affiliate links, which means I may earn a commission if you buy through them, at no extra cost to you. Metrics are calculated the same way for every product whether or not it has an affiliate link.
Not health advice
This site compares label facts and prices. It makes no health or medical claims and is not a substitute for advice from a qualified professional.