Most supplement brands ask you to trust the label. We'd rather show you the receipts.
Every product we sell at MicroNutrients is tied to a document called a Certificate of Analysis, or COA. It's the lab paperwork that proves what's actually inside the bottle matches what's printed on the front. This post explains what a COA is, how to read one, and what ours show. By the end, you'll know exactly what to look for, not just from us, but from any supplement company.
The short version
A Certificate of Analysis is a batch-specific lab report. It confirms three things that matter to your health:
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Potency. The active ingredient is present at the amount claimed, not underdosed.
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Purity. Heavy metals, solvents, and contaminants are below safe limits.
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Safety. No harmful bacteria, mold, or yeast.
If a brand can't or won't show you a COA, you have no independent proof of any of the above. You're trusting a marketing claim.
Why this matters more in supplements than almost anywhere else
Dietary supplements are not pre-approved by regulators before they reach store shelves. That puts the burden of quality on the manufacturer and, frankly, on you the buyer. Independent batch testing is how a responsible brand closes that gap. It's the difference between "we promise" and "here's the proof, with a batch number you can match to your bottle."
Underdosing is the quiet problem in this industry. A product can legally say "500 mg" on the label while delivering a fraction of that. The only way to catch it is to test the finished material and publish the result. That's what a COA does.
How to read a COA in 60 seconds
You don't need a chemistry degree. Focus on four areas:
1. Identity and batch info. Look for the product name, a batch or lot number, a manufacture date, and an expiration date. The batch number is important: it lets you confirm the certificate belongs to the exact run your bottle came from.
2. Assay or purity. This is the headline number. It tells you how much active ingredient is actually present, usually as a percentage or a measured value. Compare the "result" column to the "specification" column. The result should meet or exceed the spec.
3. Heavy metals. Lead, arsenic, cadmium, and mercury occur naturally in soil and water and can concentrate in botanical and mineral ingredients. A good COA lists each one with a limit and a result showing it's under that limit.
4. Microbiology. Total plate count, yeast and mold, and pathogen screens like Salmonella and E. coli. You want low counts and "not detected" on the pathogens.
If all four check out, the batch passes. If a section is missing, ask why.
What our COAs actually show
Here are real results from recent production batches, pulled straight from the certificates. These are representative examples, and each physical batch ships with its own corresponding report.
NMN (β-Nicotinamide Mononucleotide) Our NMN is tested by HPLC, the gold-standard method for this ingredient. The spec calls for at least 99.5% purity. The tested batch came back at 99.87%, with an assay at 100.1%. Heavy metals (lead, arsenic, mercury, cadmium) all conformed to limits at or below 0.5 ppm, and microbial counts conformed. This is high-purity material, not a diluted blend.
Magnesium 12-in-1 Complex (Magnesium Bisglycinate) Magnesium content tested at 11.45% against a minimum spec of 11.0%, and bisglycinate content at 99.5% against a 98.0% minimum. All four heavy metals were within limits, and the microbiology panel, including Salmonella and E. coli, came back not detected.
Vitamin D3 + K2 The cholecalciferol (D3) content tested at 113,000 IU/g against a minimum of 100,000 IU/g, so it actually exceeds spec. Lead measured 0.05 mg/kg and arsenic under 0.03 mg/kg, both far below their limits. Microbial counts were low, and pathogen screens passed.
Curcumin (Turmeric) Curcuminoid content tested at 99.27% against a 99.0% minimum. Moisture, ash, and granularity all passed, heavy metals complied, and Salmonella and Staphylococcus aureus were not detected.
Oregano Oil Tested for the actives that make oregano oil work, carvacrol and thymol, plus density and refractive index. The full microbiology panel, including Salmonella, E. coli, and Pseudomonas, came back not detected.
Astaxanthin 12 mg Astaxanthin assay tested at 1.17% against a 1.0% minimum, sourced from Haematococcus pluvialis. Heavy metals were well under limits (lead at 0.13 mg/kg and mercury not detected), and the microbiology panel passed, including a negative Salmonella result.
Liposomal Glutathione, independently tested with each labeled component, glutathione blend, vitamin C, riboflavin, selenium, and resveratrol, confirmed within its acceptance range. Heavy metals passed by EPA methods, and the full USP microbial panel, including E. coli, Salmonella, and Staph aureus, came back negative.
Cayenne Pepper Drops A liquid formula tested per 2 mL serving, with every labeled component, vitamin D3, vitamin K2, and the cayenne, hawthorn, and beetroot extracts, confirmed within its acceptance range. Heavy metals met USP/ICH limits, microbial limits passed with E. coli and Salmonella negative, and the formula contains no parabens, benzoates, or artificial preservatives.
A note on manufacturing standards
Beyond per-batch testing, our manufacturing partner operates under cGMP (Current Good Manufacturing Practice) standards, the framework defined in 21 CFR Part 111 for dietary supplements. cGMP governs how a facility sources, produces, labels, and holds product, so quality is built into the process, not just checked at the end. The facility is also registered as a food facility with the U.S. FDA. (To be clear and accurate: FDA facility registration is a required listing, not an FDA endorsement or approval of any specific product. We mention it for transparency, not to imply something it isn't.)
What you should expect from any supplement brand
Use this as a checklist on us or anyone else:
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A COA available on request, tied to a batch number
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Purity or assay results that meet or beat the stated specification
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Heavy metals tested and within limits
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A microbiology panel with pathogens not detected
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Honest language about certifications, with no overstated regulatory claims
Quality should be verifiable, not just advertised. That's the standard we hold ourselves to and the one we think every brand should.
Have a question about a specific batch or want to see the COA for your order? Reach out anytime. We're happy to send it.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
