How to Read a COA: Decoding Your Product's Cannabinoid Profile

A COA (Certificate of Analysis) is the "chemical ID card" of a CBD product — the only document that tells you objectively what your product contains. Here is how to read one in five minutes.

Why a COA is crucial

Three reasons never to buy CBD without a COA:

1. Legality: the COA attests that THC is below 0.3% (otherwise the product is illegal in France)
2. Efficacy: it certifies the real CBD content (fraud exists — products labelled 20% that contain 5%)
3. Safety: it verifies the absence of pesticides, heavy metals and residual solvents

Refusing to share a COA means refusing transparency. A seller who withholds it is not serious.

Anatomy of a standard COA

A proper COA contains 6-8 sections. Here is how to read each one.

Section 1 — Header

Check for:

• ✅ The laboratory's name (reputable: Eurofins, ChemNovatic, Phytocontrol, Labosphère)
• ✅ ISO 17025 accreditation (the reliability benchmark)
• ✅ A date under 12 months old (older = no longer valid)
• ✅ A batch number identical to the one on your packaging

Section 2 — Cannabinoid profile

A typical result table lists Δ9-THC, CBD, CBG, CBN, CBC, CBDV plus the acid forms (THCa, CBDa) as % of dry weight.

Check for:

• ✅ THC < 0.3% (the single most critical line)
• ✅ A CBD level matching the advertised figure (within ±10%)
• ✅ CBG, CBN and CBC present = genuine full spectrum
• ✅ Acid forms (THCa, CBDa) listed = a thorough analysis

Decoding the abbreviations:

• <LOQ = below the limit of quantification (not measurable)
• <LOD = below the limit of detection (not detected at all)
• ND = Not Detected

Section 3 — Pesticides

All tested molecules (glyphosate, carbendazim, imidacloprid, pyrethrin, malathion…) must read . A serious lab tests at least 50-60 pesticides; the big ones test 100+.

Section 4 — Heavy metals

Lead, cadmium, arsenic and mercury must all sit below WHO limits. Hemp is an accumulator plant — it draws metals out of the soil. Polluted soil means a polluted product.

Section 5 — Residual solvents

Especially important for oils and resins (extraction products). Residual ethanol under European Pharmacopoeia limits is acceptable. Detectable butane or hexane is disqualifying (poorly purged BHO extraction).

Section 6 — Microbiology & mycotoxins

All pathogens (E. coli, Salmonella) must be absent and mycotoxins (aflatoxins, ochratoxin A) undetected. Critical for dried flowers, which can develop mould if badly stored.

Section 7 — Terpene profile (quality bonus)

Myrcene, β-caryophyllene, limonene, linalool, α-pinene… Not all labs run it (it costs more). A total of 1-3% of dry weight is typical; above 2% indicates excellent preservation.

4 red flags on a COA

🚩 A COA for a different batch than yours (different date or number) → ask for the right one 🚩 No THC measurement → legality cannot be proven 🚩 CBG/CBN/CBC absent on a product labelled "full spectrum" → marketing fraud 🚩 No analysis date → potentially obsolete COA

How to verify authenticity

1. QR code on the packaging: it should point to the COA hosted on the laboratory's site (not the seller's)
2. Report number: compare it with the downloaded report
3. If in doubt: contact the laboratory directly with the report number

COAs in practice at WorldWeed

At WorldWeed, every product's COA is available via a QR code on the packaging AND as a direct link on the product page. Partner labs: Eurofins France, Phytocontrol, Labosphère — all ISO 17025 accredited. No COA, no sale. That is our commitment.

Sources

• ISO 17025 — General requirements for the competence of testing and calibration laboratories.
• Decree of 30 December 2021 (France) — THC thresholds for CBD products.
• European Pharmacopoeia — residual solvent limits.
• ANSES — pesticide recommendations for medicinal plants.