01 - Product Testing

Our products are tested three times before they reach you.

Raw material, finished batch, and an independent ISO 17025 third-party lab - the international standard for testing competence. Most supplements clear one of these checkpoints. Ours clear all three.

Standard: ISO/IEC 17025:2017 third-party accreditation
Manufacturing: 21 CFR Part 111 · cGMP · FDA-registered, USA-Based
Documentation: Per-batch COA · Supplier COA · Stability data

01

Raw material

Identity, purity, potency confirmed before any ingredient enters production.

Read stage one →

02

Finished good

In-house assay, microbial panel, and heavy-metals panel on every batch.

Read stage two →

03

Third-party verification

Independent ISO 17025 lab confirms quality and stability over shelf life.

Read stage three →

02 - The Protocol

Three checkpoints. One product.

Each stage addresses a specific quality and safety question. We take this very seriously.

Stage one · Raw material

Identity, purity, potency - before processing.

Raw ingredients are quarantined and tested upo arrival.

HPLC identity
FTIR confirmation
Heavy metals screen
Microbial screen
Active assay

What we test

Identity, purity and potency of bulk ingredients in their raw form - before they're blended, encapsulated, or labeled.

Why it matters

Botanicals like turmeric, ashwagandha, and berberine are difficult to test after blending, so testing early is important.

Proof

Every raw material arrives with a supplier Certificate of Analysis, cross-referenced against our internal acceptance limits before lots are released to production.

Stage two · Finished good

The bottle matches the label.

In-house testing of every batch, by lot.

Assay vs. label claim
Lead · Arsenic · Cadmium · Mercury
Total plate count
Yeast & mould
E. coli · Salmonella

What we test

Assay (potency vs. label claim), microbial contamination panel, and four heavy metals including lead, arsenic, cadmium, mercury.

Why it matters

Confirms the final blended, encapsulated product actually delivers what's printed on the supplement facts panel.

Proof

Every batch receives its own Certificate of Analysis (COA) tied to its LOT number. We retain COAs and reserve samples for the full shelf life of the product.

Stage three · Third party

An outside accredited lab.

The last and most important step.

ISO/IEC 17025:2017
Independent verification
Stability over shelf life
Method validation

What we test

Stability testing across the product's stated shelf life, and independent confirmation of finished-good results — assay, contamination, manufacturing quality.

Why it matters

An outside lab has no commercial reason to confirm our results. ISO 17025 accreditation is the international standard for the technical competence of testing laboratories.

Proof

Testing is performed by ISO 17025 accredited laboratories. Stability reports document potency and contamination thresholds at intervals across the product's labeled expiration date.

03 - Manufacturing & Safety

Made under manufacturing best practices.

Every NCL formula is produced in an FDA-registered facility, operating under cGMP.

Standard 01

cGMP-compliant manufacturing

All production runs follow current Good Manufacturing Practices for dietary supplements, with documented batch records, in-process checks, and quarantine until release.

21 CFR Part 111

Standard 02

FDA-registered, USA-based

Every NCL product is formulated, blended, encapsulated and bottled domestically in a facility registered with the U.S. Food & Drug Administration.

FDA Facility · Made in USA

Standard 03

Tamper-evidence on every bottle

Double safety seals (induction-sealed inner, shrink-band outer), unique LOT numbers, and printed expiration dates on every unit - so you can verify the batch on the shelf in front of you.

LOT # · EXP · Double-seal

04 - Compliance

Most testing pages stop at the lab. We don't.

Compliant labeling is just as important as the COA. We have outside counsel review what we write to keep customers informed and safe.

01

Labels reviewed under 21 CFR Part 101

Every NCL product label is reviewed by trained legal experts against the federal labeling requirements for dietary supplements before it reaches print.
02

External legal compliance review

Marketing, advertising and educational content is reviewed by external legal compliance - not just the in-house team that wrote it.
03

NSF-certified leadership

Leadership holds NSF certifications in Dietary Supplement Claims Substantiation and Label Compliance. The people approving copy understand the regulation it lives under.

05 - Anatomy of a COA

What a COA actually shows.

Five sections to a typical COA. How to read a supplement COA, ours or anyone else's.

01

Ingredient identity

Confirms the material is what the label says it is, using methods like HPLC and FTIR against a reference standard.
01

Ingredient identity

Confirms the material is what the label says it is, using methods like HPLC and FTIR against a reference standard.
02

Assay results

Actual measured potency, expressed as a percentage of the label claim.
03

Microbial panel

Total plate count, yeast & mould, E. coli, Salmonella. Confirms the finished product is safe to ingest.
04

Heavy metals panel

Lead, arsenic, cadmium, mercury - measured against per-day exposure limits, not parts-per-million.
05

Batch sign-off

LOT number, issue date, accredited lab signature. Ties this document to one specific batch on one specific shelf.

06 - Industry Best Practice

Why we test three times.

The responsibility for
safety, identity and potency
is our duty and commitment.

Here at NCL, product quality is paramount.

We verify this through a three-step testing process: raw material review, manufacturer quality testing, and independent third-party testing by an ISO/IEC 17025 accredited laboratory.

This layered approach helps confirm ingredient identity, label accuracy, purity, and safety before products reach customers.

07 - FAQ

Product Testing Q&A

Can I see a COA for my specific product and batch?

Yes. Every NCL bottle prints its LOT number on the side of the label, next to the expiration date. Email coa@naturalcurelabs.com with a photo of the LOT or type it directly, and we'll send the matching Certificate of Analysis as a PDF.

We keep COAs and reserve samples for the full labeled shelf life of the product, so older lots are still retrievable.

What does ISO 17025 mean?

ISO/IEC 17025 is the international standard for the technical competence of testing and calibration laboratories. It's the document an accreditation body uses to decide whether a lab's results can be trusted on their face.

An ISO 17025 accredited lab has demonstrated that its methods, equipment, sample handling, and personnel meet a defined competence standard — and is re-audited on a regular cycle to keep that accreditation.

Are NCL products third-party tested for heavy metals?

Yes - at two stages. Heavy metals (lead, arsenic, cadmium, mercury) are screened on raw materials at intake under our stage-one protocol, and re-tested on the finished encapsulated product in stage two. Stage three independently verifies the finished-good result through an ISO 17025 accredited lab.

Where are NCL products manufactured?

Every NCL formula is formulated, blended, encapsulated and bottled in the United States, in a facility registered with the FDA and operating under 21 CFR Part 111 (cGMP for dietary supplements).

What certifications does your facility hold?

Our manufacturing facilities are FDA-registered and accredited by either NSF or UL GMPs. Leadership separately holds NSF certifications in Dietary Supplement Claims Substantiation and Label Compliance. Third-party verification is performed by ISO 17025 accredited laboratories.

08 - Request a COA

Request the Certificate of Analysis for your product.

Send us the LOT number on your bottle and we'll email back the matching COA - typically within one business day. You can also find the most recent COA on every product page on our website.

Prefer email? Write directly to the address below. We'll attach the COA as a PDF. coa@naturalcurelabs.com