Pass/Fail COA vs Numeric Results: Why the Difference Matters for Shilajit Safety

When a shilajit brand says "third-party tested for heavy metals," the follow-up question that matters is: what type of results did that testing produce? There is a meaningful difference between a Certificate of Analysis that reports "PASS" for lead and one that reports "Lead: 0.121 mg/kg (limit: 10 mg/kg)." Both might be technically accurate — but only the second gives you the information needed to assess safety independently.

This distinction is not widely understood by consumers, and some brands exploit the gap. Understanding it is the single most important skill for evaluating shilajit safety documentation.

What a Pass/Fail COA Looks Like

A pass/fail COA reports test results as a binary outcome: PASS or FAIL, CONFORM or NON-CONFORM, DETECTED / NOT DETECTED (when a detection threshold is the only information given). The product page or packaging states that the product has "passed heavy metals testing" — and the COA, if provided at all, confirms this with a checkbox or stamp.

This format is widely used for microbiological testing — PASS / FAIL for Salmonella, E. coli, and Staph aureus is appropriate because the threshold is binary (presence vs absence). For heavy metals, however, it is not appropriate, because the safety question is quantitative: how close to the limit is this product?

Why Pass/Fail Is Insufficient for Heavy Metals

There are four specific problems with pass/fail heavy metals results for shilajit:

1. You cannot verify the limit used. Different standards set different heavy metal limits. USP <232> allows up to 10 µg/day of lead for oral supplements. California Proposition 65 sets the threshold at 0.5 µg/day — twenty times stricter. If a COA says "PASS" without stating which limit was applied, you cannot know whether the product meets the standard relevant to your situation. A lab can legitimately issue a "PASS" against a lenient internal threshold that would fail under Prop 65.

2. You cannot see proximity to the limit. A product containing 0.09 mg/kg of lead and a product containing 0.9 mg/kg of lead might both receive a "PASS" under the same standard. But the second product leaves almost no safety margin — and at twice the stated serving size, it could exceed the limit. Numeric results let you evaluate this; pass/fail does not.

3. Labs can set their own thresholds. Not all testing laboratories apply the same limits. Some use USP <232>. Some use the dietary supplement reference limits from the FDA. Some apply internal thresholds agreed with the client brand. Without the numeric result, there is no way to translate "PASS" into any specific safety standard.

4. The "summarised version" disclaimer. Some brands publish what they describe as a "summary" COA — a one-page pass/fail document described as being derived from a longer full report. This framing implies a complete analysis was done, while providing the least useful output. A COA described as "summarised" without the underlying numeric data should be treated as equivalent to no COA for the purposes of heavy metals assessment.

What ICP-MS Is and Why It Is the Gold Standard

ICP-MS stands for Inductively Coupled Plasma Mass Spectrometry. It is the analytical method used by accredited laboratories to measure trace metals in food, supplements, and biological samples at parts-per-billion (ppb) and parts-per-trillion (ppt) concentrations — far more sensitive than older techniques such as atomic absorption spectroscopy (AAS).

In a typical ICP-MS analysis, the sample is dissolved in acid and introduced into a plasma torch at approximately 6,000–8,000°C. The resulting ions are separated by mass-to-charge ratio and detected individually. This allows simultaneous quantification of lead, arsenic, mercury, cadmium, and dozens of other elements in a single run, with detection limits in the sub-ppb range.

For heavy metals in shilajit, the relevant standard method is EPA 6020B or the equivalent USP <233> procedure. A COA that specifies the analytical method (e.g., "ICP-MS per EPA 6020B") is more credible than one that simply states "heavy metals panel."

What Numeric Results Look Like: Reference Values

A credible numeric heavy metals panel for a purified shilajit resin might look like the following — based on results observed in COAs from accredited laboratories for well-tested products in our database:

Note: To convert mg/kg results to µg per serving, multiply the concentration by your serving weight in grams. A 500 mg serving of 0.121 mg/kg lead product yields 0.5 g × 0.121 mg/kg = 0.0000605 mg = 0.0605 µg of lead — well below the 10 µg/day USP limit and also below the 0.5 µg/day Prop 65 threshold.

How to Tell the Difference When Reading a COA

When evaluating a COA, look for these specific indicators of numeric results:

• Results expressed as mg/kg, ppm, ppb, or µg/g (not just PASS/FAIL)
• A reference or specification column stating the limit applied (e.g., <10 mg/kg per USP <232>)
• The analytical method named (ICP-MS, ICP-OES, EPA 6020B)
• A detection limit (LOD/LOQ) listed for each element
• Lab accreditation number (ISO 17025 accreditation, A2LA, UKAS, or ANAB certificate number)

If the COA has none of these and only shows PASS or CONFORM, treat it as unverified — regardless of how reputable the brand appears.

The ShilajitDB Approach

In our database, products with public COAs containing numeric heavy metal results from named, accredited laboratories receive the highest testing transparency scores. Products with pass/fail-only documentation receive partial credit only. Products with no COA at all receive no credit for testing claims regardless of what the brand states on its packaging.

When you use our database filters, the "Heavy metals tested" filter shows products that have at least claimed some form of testing. To identify products with the most credible numeric documentation, look for products with a named lab and a public COA — these are the ones most likely to have the full numeric results format described in this article.