Tested Clean
Reviewed by Sarah Miletich, co-founder and formulator | Last reviewed October 9, 2026
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What “Tested Clean” Means at Proof
We test because we use these products ourselves, and because our customers trust us with products that go on or in their body. Proof works with independent, ISO/IEC 17025 accredited laboratories, including Anresco Laboratories and SC Labs. These labs have no financial stake in whether a product passes or fails.
Our testing program looks at cannabinoid potency and the contaminants that matter most for hemp and cannabis products. Explore the panels below to see what we look for and why.
What We Test For
Potency testing measures cannabinoids such as CBD, CBN, CBG, and delta-9 THC. It verifies that cannabinoid levels align with the product label and confirms hemp products remain within applicable hemp-derived THC limits.
This panel screens for organophosphates, organochlorines, and other pesticide residues that can be introduced during cultivation.
Mycotoxin testing looks for toxic compounds, including aflatoxins and ochratoxin A, that may be produced by mold or fungi on improperly dried or stored plant material.
CBD and CBN extraction may use a solvent, such as ethanol or CO2. This panel checks that the extraction process leaves the final extract free from concerning solvent residue.
Heavy metal testing screens for lead, mercury, cadmium, and arsenic.
This panel screens for microbial contaminants, including E. coli, Salmonella, yeast, and mold.
Results by Product
These are the published lab results for each Proof hemp product. Each report covers cannabinoid potency and microbials for the finished product. Pesticides, heavy metals, mycotoxins and residual solvents are screened on the hemp inputs; those reports are on the Lab Testing page, matched to each batch.
| Product | Label claim | Tested result | THC result | Lab | Test date | Report |
|---|---|---|---|---|---|---|
| CBD Comfort Drops | 33 mg CBD per dose, 30 doses (990 mg per bottle) | 1,027 mg CBD per bottle | Not detected | SC Labs | May 11, 2025 | View PDF (batch HT0101-050325) |
| CBD + CBN Sleepy Drops | 20 mg CBD + 20 mg CBN per dose, 30 doses (600 mg of each per bottle) | 617 mg CBD and 618 mg CBN per bottle | Not detected | SC Labs | May 11, 2025 | View PDF (batch HT0103-050325) |
| Pets CBD Drops | 300 mg CBD per bottle | 305 mg CBD per bottle | Not detected | SC Labs | May 11, 2025 | View PDF (batch HT0104-050325) |
| Ice Hot CBD Roll-On | 1,000 mg CBD per bottle | 1,002 mg CBD per bottle | Not detected | SC Labs | May 11, 2025 | View PDF (batch HR0101-050325) |
Results are rounded to the nearest milligram. Each report is for the batch named on it.
How to Read a COA
A Certificate of Analysis, or COA, is an official lab report. It can look technical at first, but a few sections tell you most of what you need to know.
Start with the cannabinoid panel
Near the top of the report, look for the cannabinoid profile. You will see cannabinoids such as CBD, CBN, CBG, and delta-9 THC, often reported as percentages and milligrams. Compare the reported CBD or CBN amount with the product label. The figures should align closely.
Review the contaminant panels
Look for results for pesticides, mycotoxins, residual solvents, heavy metals, and microbials. Results may be marked “ND,” meaning not detected, or listed as a measured value against an action limit, the maximum amount allowed by the testing standard. A passing result means reported values are not detected or fall below the applicable action limit.
Terms you will see: ND means not detected. LOD (limit of detection) is the smallest amount the method can detect. LOQ (limit of quantitation) is the smallest amount it can measure with confidence. An action limit is the maximum amount of a contaminant the testing standard allows.
Check the lab and report details
The report identifies the testing laboratory, testing date, analytical methods, and other documentation details. Proof works with Anresco Laboratories and SC Labs, independent ISO/IEC 17025 accredited laboratories.
Ingredient-Level vs Finished-Batch Testing
Proof serves customers through two sales channels, cannabis and hemp. They are two channels of the same Proof brand, not separate brands. The regulatory frameworks differ, so our testing approach reflects the requirements of each channel.
Cannabis
California cannabis regulations require independent testing of final cannabis production before products reach the shelf. If a cannabis product does not pass the required testing panels, it is not approved for sale.
Hemp
Proof tests all hemp inputs. The hemp extracts used in each formulation are independently tested, and the reports are published on the Lab Testing page alongside the batches they were used in.
Proof also tests initial batches of each product. Those tests validate the formulation technique and the non-hemp ingredients, and they are the product reports in the table above. Proof does not currently test each individual product batch.
Tested Clean FAQ
What does "tested clean" mean for CBD?
At Proof it means an independent, ISO/IEC 17025 accredited lab has checked cannabinoid potency and screened for pesticides, mycotoxins, residual solvents, heavy metals and microbials, and the results are published as a Certificate of Analysis.
Who tests Proof CBD?
Anresco Laboratories and SC Labs. Both are independent, ISO/IEC 17025 accredited, and have no financial stake in whether a product passes.
Does Proof test every batch?
No. Proof tests all hemp inputs, and tests initial batches of each product to validate the formulation technique and the non-hemp ingredients. Proof does not currently test each individual product batch. The Lab Testing page shows which tested hemp inputs went into each batch.
Is ingredient-level testing the same as batch testing?
No. Batch testing analyzes a finished production batch. Ingredient-level testing analyzes the hemp extract before it is formulated. Proof's hemp products are made from independently tested hemp inputs, using a formulation method that was validated by testing initial product batches.
What does ND mean on a CBD lab report?
ND means "not detected": the lab's method did not find the substance at or above the lowest level it can detect.
What is the difference between LOD and LOQ?
LOD (limit of detection) is the smallest amount a method can detect. LOQ (limit of quantitation) is the smallest amount it can measure with confidence. A result can be above the LOD but below the LOQ.
What is an action limit on a COA?
It is the maximum amount of a contaminant the testing standard allows. A result passes when it is not detected or falls below that limit.
What is the difference between a full-panel COA and a potency-only COA?
A potency-only report shows cannabinoid amounts. A full-panel report also covers pesticides, heavy metals, mycotoxins, residual solvents and microbials. Only a full panel tells you about contaminants.
Does THC-free mean zero THC?
No lab can prove zero. THC-free means THC was not detected by the lab's method. On the product reports published here, delta-9 THC and total THC were not detected, and the lab's limit of detection for delta-9 THC was 0.002 mg per mL.
How do I verify a CBD COA is real?
Check that the report names the lab, a report or sample ID, and a test date, and that the product or ingredient named matches what you bought. You can contact the lab with the report ID to confirm it issued the document.
Why does a lab-tested product carry a Prop 65 warning?
A Prop 65 warning is a California labeling requirement, not a test result. THC is on the Prop 65 list with no safe harbor level, so a product whose lab report shows THC as not detected can still carry the warning.
See the Documentation
Want to explore the lab documents behind our testing program? Visit our Lab Testing & COAs page for our testing partners, accreditation information, product COAs, and hemp input COA references.