What is a Certificate of Analysis — and why your co-packer won't run without one.

One of the most common reasons a production run gets delayed is a missing Certificate of Analysis. Brands are ready to go — formula locked, film ordered, run date scheduled — and the COA either hasn't arrived or doesn't meet spec. The run doesn't happen.

This guide covers everything you need to know about COAs before your first production run.

What Is a Certificate of Analysis?

A Certificate of Analysis (COA) is a document issued by a laboratory or manufacturer that certifies the quality, purity, and composition of an ingredient or product. For supplement and food brands, COAs are issued by your ingredient supplier and confirm that what you ordered is actually what you received — and that it meets safety and quality standards.

A typical COA includes:

• Product name and lot number — identifies the specific batch
• Supplier and manufacturer information
• Test date and expiration date
• Appearance and physical properties — color, odor, particle size
• Assay / potency results — confirms the active ingredient is present at the labeled amount
• Heavy metals testing — lead, arsenic, mercury, cadmium
• Microbiological testing — total plate count, yeast, mold, E. coli, Salmonella
• Moisture content
• Pass/fail statement — the lab's conclusion

Why Co-Packers Require COAs

A reputable, FDA-registered co-packer will not run your product without COAs on file for every ingredient in your blend. Here's why:

FDA compliance

Under FDA regulations for dietary supplements (21 CFR Part 111 — Current Good Manufacturing Practice), manufacturers are required to verify the identity of each ingredient before it's used in production. A co-packer that runs your product without ingredient documentation is out of compliance — and so are you.

Liability protection

If a product causes harm and it's traced back to a contaminated ingredient, the question of who had documentation becomes central. Co-packers who don't require COAs are accepting liability they can't afford. Brands who don't provide COAs are exposing themselves to the same risk.

Quality control

COAs let a co-packer verify that your ingredients match your formula spec before the run. If your protein supplier ships you a batch with 70% protein content instead of the 80% your formula calls for, a COA review catches that before it becomes 10,000 mis-labeled pouches.

How to Get a COA

COAs come from your ingredient supplier. Here's the process:

1. Order your ingredients. When you place your order, specify that you need a COA for each lot you receive.
2. Request the COA with your order confirmation. Some suppliers automatically include COAs with shipments. Others need to be asked explicitly.
3. Verify the COA matches your shipment. The lot number on the COA should match the lot number on your ingredient packaging. If they don't match, follow up with your supplier immediately.
4. Send COAs to your co-packer before your run date. Don't wait until the day of. Send them at least a week out so any issues can be resolved without delaying your run.

What If Your Supplier Won't Provide a COA?

Find a different supplier. A legitimate ingredient supplier will always provide a COA for their products. If a supplier can't or won't provide documentation of ingredient identity, purity, and potency, that's a significant red flag about the quality of what they're selling you.

This is especially important for active ingredients — protein, creatine, vitamins, amino acids, botanical extracts. The supplement industry has a documented history of ingredient adulteration and mislabeling. COAs are the minimum protection against building your brand on an ingredient that isn't what you think it is.

Third-Party Testing vs. Supplier COAs

Supplier-issued COAs confirm what the supplier says is in the ingredient. Third-party COAs — issued by an independent laboratory — verify those claims independently. For high-stakes ingredients or in cases where you want additional confidence, third-party testing adds a layer of verification that supplier documentation can't provide.

Third-party testing is not required by most co-packers, but it is increasingly required by Amazon, retail buyers, and direct-to-consumer brands that want to make label claims with confidence. Overgang can connect you with testing labs we trust — we don't mark up the fees.

COA Checklist — Before Your Production Run

• COA received from supplier for every ingredient in your blend
• Lot number on COA matches lot number on ingredient packaging
• COA is dated within acceptable range (check with your co-packer)
• All tests on COA show passing results
• COAs sent to co-packer at least one week before run date
• Co-packer has confirmed receipt and approval of all COAs