Look up the report for your lot.

Type the four-digit lot number from your bottle. The report shows the dose on the label, what the lab measured, and four heavy metals.

Lot report

Lot 2604Sample report

Magnesium glycinate

Elemental magnesium, per 2 capsules. Tested , Independent lab.

Label
200mg
Measured
204mg
Result
102%
Heavy metals, µg per serving
MetalMeasuredLimitStatus
Lead0.425.0Under limit
Cadmium0.115.0Under limit
Arsenic0.3015.0Under limit
Mercury0.0215.0Under limit
Samples

Where the lot number is printed

Every bottle and jar has a plain white band where the label sits. The lot number is printed along the bottom edge of that band, after the word Lot: four digits, for example 2604.

Every container from the same production run carries the same number, so the report you read is the report for that run. Type the four digits on their own, or "Lot 2604". Both work.

A hand turning an amber supplement bottle on a pale stone counter, the white label band facing the light.
Turn the bottle; the number is on the band's lower edge.

What each report contains

Six things, in the same order on every lot.

What was measured
The ingredient the dose is checked against, for example elemental magnesium or EPA, and the serving it is measured per.
Label
The amount printed on the bottle for one serving.
Measured
The amount the lab found in one serving from that lot.
Result
Measured as a percent of label. 100% means the lot matched the label exactly.
Heavy metals
Lead, cadmium, arsenic and mercury, in micrograms per serving, each next to its USP <2232> daily limit.
Test date and lab
The day the lot was tested and who tested it. On this site the lab reads "Independent lab" until the lab is named.

How to read the result

The result is the measured amount divided by the label amount. At 98%, a serving held 2% less than the label says. At 107%, it held 7% more.

A little over is common with vitamins. They are often made with a small overage so the dose still matches the label late in the bottle's shelf life. A result well under the label is the one to watch.

"Under limit" means the metal measured in one serving is below the USP <2232> daily limit for that metal. The limit is printed on the row beside the result, so you can see how far under it is.

A report covers the lot it names, nothing else. It is not medical advice: ask your doctor about dosing.

Lot 2615Sample report

Electrolyte mix, unflavored

Sodium, per 1 scoop (3.5 g)

Label
500mg
Measured
492mg
Result
98%
Lot 2598Sample report

Vitamin D3 + K2

Vitamin D3 (cholecalciferol), per 1 capsule

Label
50mcg
Measured
53.5mcg
Result
107%

How a lot gets its report

Sampling, the lab, what is tested in each product, and what happens to a lot that misses.