How to Read a Certificate of Analysis (COA) for Peptides and Anabolics

A certificate of analysis, or COA, is a documented laboratory record showing the chemical identity, purity, contamination profile, and analytical methodology used to characterise a specific sample. In the peptide, anabolic, SARM, and pharmaceutical compound markets in the Philippines, a COA is the only objective record you have that what is in the vial matches the label.

The problem is that not every COA in circulation is a real COA. Some are not produced by any laboratory at all, just designed by a graphic designer with stock chromatograms pasted in. Others are produced by labs financially dependent on the seller. A meaningful share are real laboratory work but missing critical fields. The result, for a Filipino buyer trying to verify a peptide vial bought through grey-market channels, is that the document handed to you may be reassurance, evidence, or theatre, and you cannot tell which without knowing how to read it.

This guide walks through every section of a defensible COA, what each field actually means, how to spot a fake or adulterated COA, and how an independent third-party COA from a lab like Lumen Labs (the Philippine peer to an established international peptide-testing laboratory in Czechia and another international laboratory in the United States) differs from a vendor-supplied COA. We will use the same field structure that the Philippine peptide community sees in real reports.

A note on Filipino search results, "COA" returns Commission on Audit results in most Philippine search rankings. This guide is about chemistry, not government accounting. We use "certificate of analysis" interchangeably with COA below.

What a COA documents and what it does not

A COA documents three things at minimum:

1. Identity: what the substance actually is, confirmed by an analytical method that can distinguish between the labelled compound and structurally similar compounds.
2. Purity: how much of the sample is the labelled compound versus impurities, degradants, or other substances.
3. Quantitation: the absolute amount of the active compound, in milligrams or units.

A defensible COA also documents:

• Sample identity (what was submitted, in what form, by whom or as anonymous)
• Method names (HPLC, GC-MS, LC-MS, ICP-MS, etc.)
• Date of analysis
• Analyst signature or laboratory identifier
• Measurement uncertainty range
• A unique verification reference so the document is checkable

A COA does not certify:

• That the compound is safe for human consumption
• That it is therapeutic at the labelled dose
• That future batches from the same source will match
• That storage stability has been tested

Conflating "the COA passed" with "the product is safe" is one of the most common mistakes Filipino peptide users make.

Section 1: Sample identification

Every defensible COA begins with sample identification. Look for:

• Sample reference or task number: the lab assigns a unique reference. Lumen Labs uses task numbers in the format `LL-YYYYNNN`. Other labs use their own systems.
• Date received: when the lab took possession of the sample.
• Date analysed: when the analysis was run. May be the same day or a few days later.
• Physical form: vial, ampoule, lyophilised powder, capsule, oil suspension. This affects what methodology is appropriate.
• Claimed compound: what the label said the substance was.
• Claimed amount: what the label said the dose was. e.g. "5 mg" or "250 mg/mL".
• Submitter (where disclosed): the client name, anonymised, or "anonymous public submission" depending on the lab's privacy policy.

Red flags in this section:

• No task number or reference.
• "Sample tested" with no description of what.
• Date analysed missing or implausible (in the future, or matching the document creation date suspiciously).
• Submitter missing entirely. A real lab knows who submitted the sample, even if the COA does not publish it.

Section 2: Methodology

The single most important section of a COA, and the one most often missing on fake or vendor-supplied documents. The lab must name the analytical methods used, in enough detail that a different lab could reproduce the result.

For peptides, the standard methods you should expect to see:

• High-performance liquid chromatography (HPLC): the workhorse for purity. HPLC separates the compound from impurities and degradants. The output is a chromatogram showing peaks at different retention times, with a percent peak area for the target compound. Purity is usually reported at a specific wavelength such as 220 nm or 280 nm. We have a full HPLC explainer that covers what the technique does and why it matters.
• Liquid chromatography mass spectrometry (LC-MS): confirms identity by measuring the molecular mass of the compound. For a peptide, the measured mass should match the theoretical mass of the labelled sequence within a few parts per million. This is how the lab confirms BPC-157 is actually BPC-157 and not a similar peptide that would also produce a peak on HPLC.
• CHNS elemental analysis: measures carbon, hydrogen, nitrogen, sulfur ratios. Used as an additional identity check for raw powders.

For anabolic steroids:

• Gas chromatography mass spectrometry (GC-MS): separates the steroid ester from the oil base and confirms identity by molecular mass. Distinguishes testosterone enanthate from cypionate from propionate.
• HPLC: also used for ester quantitation.

For contamination screening:

• Inductively coupled plasma mass spectrometry (ICP-MS): heavy metals at parts-per-billion sensitivity. Reports arsenic, cadmium, lead, mercury per ICH Q3D guidelines.
• Limulus amebocyte lysate (LAL): bacterial endotoxin detection. Required for any injectable to be considered safe.
• USP 61 microbial limits: total aerobic microbial count plus total yeast and mould count.

Red flags in this section:

• No method named at all. The COA reports "purity 98 percent" with no statement of how it was measured.
• Method named but no instrumentation (column type, mobile phase, detection wavelength). Generic "HPLC" without parameters is a soft red flag.
• Methods that do not match the analyte. A peptide COA that lists only "GC-MS" is suspicious; gas chromatography is poorly suited to large peptides.
• Methods listed but no chromatogram or supporting data.

Section 3: Identity confirmation

How does the lab actually know the substance is what the label says? Two pieces of evidence, used together:

Mass match. The measured molecular mass (from LC-MS for peptides, GC-MS for steroids) must match the theoretical mass of the claimed compound within a small tolerance, typically less than 5 ppm for high-resolution instruments. A peptide with a theoretical mass of 1419.5 Da that measures at 1419.5 Da is a match. A peptide that measures at 1296.4 Da is something else.

Retention time match. On HPLC, the labelled compound should elute at the same retention time as a reference standard run on the same column under the same conditions. This is corroborating evidence for identity.

For the most rigorous identification, both are required. A mass match alone is suggestive. A retention-time match alone is also suggestive. Together they are conclusive.

A COA that reports purity (a percent number) without addressing identity is incomplete. The HPLC purity peak might be 98 percent of something. If "something" is not what the label claimed, the 98 percent number is meaningless.

Section 4: Purity by HPLC

For peptides, purity is reported as percent peak area at the absorbance wavelength of the chromatogram. For finished pharmaceutical-grade peptides, what to expect:

• Above 95 percent: typical and acceptable for most therapeutic peptides.
• 90 to 95 percent: meaningfully impure; investigate the impurity profile.
• Below 90 percent: reject for injectable use.
• Above 99 percent: rare on commercial peptide product; if claimed, scrutinise the chromatogram for missing baseline peaks.

For steroids, purity above 99 percent is common because the synthesis is well-established and the products are simpler molecules. Below 95 percent for a finished steroid product warrants investigation.

A purity number with no reported wavelength is missing context. Different wavelengths flag different impurities. The most common standard for peptides is 220 nm, which detects peptide bonds. Some impurities absorb only at higher or lower wavelengths and can hide at 220 nm.

Section 5: Quantitation

How much of the active compound is actually in the vial?

For a 5 mg peptide vial, a defensible COA reports the measured amount, e.g. "4.95 mg". A 1 to 5 percent variance from label claim is normal and acceptable. A 10 percent or more under-claim variance (e.g. 4.5 mg in a vial labelled 5 mg) is significant. A 30 percent or more variance is reject territory.

Quantitation requires a reference standard of known concentration to be run alongside the sample. A COA that reports purity but not quantitation can still be defensible (purity is the harder question), but the absence of quantitation is increasingly unusual on serious labs.

For a 250 mg/mL testosterone enanthate vial, expect quantitation in the form "247 mg/mL" or "242 mg/mL". Variance above 5 percent on a clinical-grade product is unusual; on grey-market product, 10 to 30 percent variance is documented in published case data.

Section 6: Related substances and impurities

For peptides specifically, the impurity profile matters because peptide synthesis can produce related substances that absorb on HPLC but are not the target peptide. Common related substances:

• Truncated peptides: missing one or more amino acids from the N-terminus or C-terminus. Often inactive.
• Deamidated peptides: glutamine or asparagine residues that have spontaneously degraded. May or may not retain activity.
• Oxidised peptides: methionine or tryptophan residues that have oxidised. Activity reduced.
• Aggregated or polymerised peptides: dimers and higher oligomers from improper storage or synthesis.

A complete COA reports the major impurities by retention time and percent. For most peptide users, this level of detail is not necessary; the headline purity number is enough. For a pharmaceutical-grade product, the impurity table matters.

Section 7: Contamination and sterility

For any injectable, contamination matters as much as identity and purity:

• Heavy metals: arsenic, cadmium, lead, mercury. ICH Q3D limits for parenteral products. ICP-MS detects to parts-per-billion.
• Endotoxin: bacterial endotoxin from gram-negative organisms. Limit for injectables is typically 0.5 EU/mg or lower depending on dose. Above the limit means the product cannot be safely injected regardless of identity and purity.
• Microbial limits: total aerobic microbial count and total yeast and mould count, per USP 61. Sterility is the highest standard; bioburden limits are the practical floor.

A vial with the correct active ingredient but endotoxin above limit will cause systemic inflammatory response on injection. This is a real, documented risk in grey-market peptides, especially those manufactured under poor sterility conditions.

The HGH peptides versus real HGH guide covers an extreme case of contamination risk in unregulated peptide product.

Section 8: Verification reference

A defensible COA includes a unique verification reference so the document can be checked against the lab's records. At Lumen Labs, this is the task number plus a unique key. The verification flow:

1. Locate the task number and unique key on the document.
2. Visit the lab's verification page (for Lumen Labs, /pages/verify).
3. Enter both fields.
4. The page returns either the original analytical data (match) or a no-match result.

Without a verification reference, the document cannot be authenticated. A PDF can be edited, copied, and re-purposed. The verification reference is what separates a real lab record from a Word document with a logo.

How to spot a fake or vendor-fabricated COA

The pattern of fake COAs in Philippine grey-market circulation:

1. No verification reference. The document cannot be checked.
2. No method names. "Purity 99 percent" with no statement of how it was measured.
3. No date or implausible date (a fresh-looking COA dated 2019; a COA dated in the future).
4. No analyst signature or initials. Real labs sign their work, even with anonymised analyst IDs.
5. Identical chromatogram across multiple "different" batches. Side-by-side comparison shows the same chromatogram pasted onto different reports.
6. Fonts and layout that do not match a known lab's house style. Real labs use consistent templates.
7. A vendor logo and a "lab" logo where the lab cannot be found by name search. Some "labs" exist only as logos.
8. No measurement uncertainty range. Real analytical chemistry has known measurement error. A COA that reports a single number with no uncertainty is incomplete.
9. No statement of what was tested. "Tested for purity" with no description of identity, contamination, or quantitation.

We have a separate piece on why vendor COAs cannot be trusted and the structural reasons a seller's own analytical certificate is not adequate evidence.

Independent third-party COA: what makes it different

The defining feature of an independent COA is that the laboratory issuing the document has no commercial relationship with the seller of the product. The lab is paid by the buyer, or by an independent third party, to test the sample. The lab does not benefit from the result one way or the other.

Lumen Labs operates this way in the Philippine market. an established international peptide-testing laboratory (Czechia) and another international laboratory (USA) operate this way internationally. The conflict-of-interest structure is what makes the document defensible. A COA produced by a lab paid by the seller to make sales materials is not in the same category, regardless of the analytical work behind it.

Independent COAs also use lab-controlled reference standards (not standards supplied by the seller, which could themselves be adulterated), publish methodology, document uncertainty, and provide verification references. The methodology is described in our how peptide testing works explainer.

For specific concerns about counterfeit pharmaceutical products in the Philippine market beyond peptides, the counterfeit pharmaceuticals Philippines reference covers the broader regulatory and harm-reduction landscape.

How to use a COA in practice

If you have a COA and want to evaluate it:

1. Check the verification reference. If it has none, the document is unverifiable. Stop here.
2. Check the lab name. Search for it. A real lab has an address, instrumentation, and a publicly searchable record.
3. Check the methodology. The methods named must match the analyte type.
4. Check the identity confirmation. Mass match, retention time match, or both.
5. Check the purity number with wavelength.
6. Check the quantitation.
7. Check the date and that the sample matches what you have.
8. Check the independence. Is the lab paid by the seller, or is the COA independent third-party?

If any of these fail, the COA does not provide the assurance the seller is claiming. The next step is sending a sample to an independent lab. The step-by-step guide to sending a sample to Lumen Labs covers packaging, courier, and turnaround time.

For Filipino peptide communities running group orders, group testing is a cost-effective way to verify a batch across multiple users, splitting the analytical cost.

Bottom line on reading a COA

A COA is a document. The value of the document depends on the laboratory that produced it, the methodology used, and whether it is independent of the seller. Filipino peptide and anabolic users who learn to read a COA properly are in a meaningfully better position than those who treat the document as a guarantee.

If the document does not have the structure described in this guide, it does not provide the evidence the seller is claiming it does. Send the actual sample for independent third-party analysis instead.

Disclaimer: Lumen Labs provides chemical analysis of submitted samples for harm-reduction and quality-verification purposes. We are not a substitute for medical care. This article is educational and reflects general analytical-chemistry practice; specific Philippine market conditions and laboratory standards may evolve.