A result you can actually read.

A chromatogram is where the answer begins—not where a customer’s understanding should end. Follow one authentic Vitamin D3 run from raw instrument output to the sentence someone actually needs.

An illustrated chromatogram: three peaks rising from a flat baseline, the tallest highlighted in amber as the one being read.

One trace · all the way through

Start with what the lab sees.

The first frame is a real published run of a commercial Vitamin D3 + K2 supplement. Use the controls—or let it play—to watch that same trace get digitized, identify the cholecalciferol peak, and resolve into the study’s reported Vitamin D3 assay.

Nothing below invents a second graph. Raw, trace, and read are three views of one measurement. Replay it, jump to a stage, or scrub the transition yourself.

The decode · Vitamin D3UHPLC-DAD · DAD 265 nm · Acclaim C30 · 150 × 4.6 mm · 5 µm

Published UHPLC chromatogram of a commercial dietary-supplement capsule containing cholecalciferol vitamin D3 and menaquinone-4 vitamin K2.

Authentic published figure

This is an authentic published run — every peak present, none of them labeled yet.Authentic source capture: Becze et al., Molecules (2021), Figure 3 · CC BY 4.0. The trace is deterministically digitized from this published figure, which may be shown cropped. This is a published reference sample, not an Analyte customer batch.

Curious how the peak area becomes a number?

Illustrative example of external-standard quantitation — generic teaching values, not the published study’s calibration data.

Calibration curve — how a signal becomes a number (illustrative)x: concentration (µg/mL) · y: peak area (mAU·s)

calibration standardsfitted line (least-squares)unknown sample projection

A standard curve turns an instrument signal into a real concentration. Five known standards (blue) fix a straight line; the unknown’s signal (amber) is projected onto it to read its concentration. Hover, tap, or focus the points, the sample projection, or the LOD/LOQ band.

The answer

Now it becomes a report.

The published sample grounds the potency walkthrough. The teaching certificate brings that answer together with illustrative identity, heavy-metal, and microbial rows—organized around the questions a person would actually ask.

First—what’s an analyte?

An analyte is simply the thing being measured. Here, it is cholecalciferol—vitamin D3. Everything else in the softgel is the matrix the method has to separate it from.

TEACHING REPORT · PUBLISHED POTENCY EXAMPLE, ILLUSTRATIVE SAFETY PANELS

Vitamin D3

Capsule · 1000 IU (25 µg) D3 · 100 µg K2 (MK-4)

EXAMPLE

BATCH: REF-DS-CHL-MK4
PANELS: 4 / 4

IDENTITYIs it what the label says?

Before anything else, the lab proves the active really is the compound on the label — matched against a certified reference, not just taken on trust.

POTENCYIs there as much as it claims?

How much of the active is actually in there, measured against a calibrated standard and compared to the dose the label states.

You’re getting essentially what the label promises — about 103% of the stated 1000 IU. Fat-soluble vitamins are allowed a wide window (90–165%) because makers add a little overage so the claim still holds at the end of shelf life. A slight over is normal and expected.
MEASURED
25.7 µg (1028 IU) per capsule
LIMIT / BASIS
90–165% of claim (USP fat-soluble vitamin monograph)
METHOD
UHPLC-DAD · Acclaim C30
Revisit the source chromatogram ↑

HEAVY METALSWhat came along that shouldn’t have?

Trace contaminants — lead, arsenic, cadmium, mercury — counted down to parts per billion and checked against the USP <2232> daily-intake ceilings.

MICROBIALSIs it clean?

A hygiene and safety check: how many microbes the product carries, and confirmation that the pathogens that must never appear are entirely absent.

Testing referenced here is performed by independent ISO/IEC 17025-accredited laboratories. Analyte interprets and publishes results; it is not itself a laboratory. The potency walkthrough cites a published commercial-supplement sample; identity and safety values are illustrative.

Open any row for the plain-English explanation and technical basis.

Not just vitamins

Heavy metals read the same way.

The same raw → trace → read holds for contaminants. This is a real published arsenic-speciation run: arsenic isn’t one thing, and the separation is exactly what tells the toxic inorganic forms apart from the harmless organic ones — which is the fraction a supplement limit actually regulates.

The decode · Heavy metals · arsenic speciationHPLC-ICP-MS · ICP-MS ⁷⁵As · anion-exchange · arsenic speciation

Published HPLC-ICP-MS chromatogram separating five arsenic species on the arsenic-75 channel.

Authentic published figure

This is an authentic published run — every peak present, none of them labeled yet.Authentic source capture: Nguyen et al., J. Anal. Methods Chem. (2018), Figure 1 · CC BY 4.0. The trace is deterministically digitized from this published figure, which may be shown cropped. This is a published reference sample, not an Analyte customer batch.

A different kind of test

Microbes are counted, not separated.

There’s no chromatogram here — a hygiene check counts living colonies on agar. The trick is dilution: thin the sample until the colonies are countable, then multiply back up to CFU per gram and compare with the limit.

The count · microbial load (TAMC)USP <2021> · pour plate · CFU per gram

One gram of product, thinned 10× at each step. Follow the ladder until the colonies are countable — then multiply back up.

40 distinct colonies, inside the reliable 25–250 window. This is the plate you count.40 colonies × 100 (÷ 10⁻²) = 4.0 × 10³ CFU/gPASS · limit ≤ 10⁴ CFU/g · ~2.5× under the ceilingIllustrative example. Real counts come from an ISO/IEC 17025 lab; CFU/g is a back-calculation from the countable plate, not a direct reading.

The technical depth is still there.

It just no longer interrupts the main story. These are the four terms worth knowing; the rest belongs inside the relevant result when someone asks for it.

Percent of label claim: How the measured amount compares with the amount promised on the label. The example batch reads 103%: essentially what the label says, with a small expected overage.
Retention time: When a compound leaves the chromatography column. Under a fixed method, matching the reference standard’s retention time helps identify the peak.
Permitted daily exposure: The most of an elemental impurity a person can take in per day. Heavy-metal results are compared with these daily ceilings, not with zero.
CFU/g: Colony-forming units per gram. It counts general microbial load; specified pathogens such as Salmonella and E. coli must be absent.

The same explanation can live anywhere the result does.

In the public library, on a full report, or inside a brand’s product-page widget.

Browse the library See the widget

Have something to test? Submit a sample or email the founder.

Calibrating

Now it becomes a report.

First—what’s an analyte?

An analyte is simply the thing being measured. Here, it is cholecalciferol—vitamin D3. Everything else in the softgel is the matrix the method has to separate it from.

Heavy metals read the same way.