Supplement Quality Check: Audit in Five Steps

Audit Path

1. Manufacturer Transparency – Company address, production country, GMP certificates.
2. COA (Certificate of Analysis) – Check if batch matches your product.
3. Excipients – Allergens, fillers, flow agents.
4. Bioavailability – Form (e.g., bisglycinate vs. oxide).
5. Document Batch – Photo, purchase date, target value.

Rating Scale

Score	Criterion
5	Full transparency, COA available, stable supply chain
3	Partial info, no independent testing
1	Marketing claims only, no data

Implementation in Daily Life

• Use an audit template that you update with each order.
• Store supplier insights right next to your biomarker trends.
• Plan semi-annual quality reviews to change batches or test alternatives.

Conclusion

The cleaner your audit, the fewer surprises in your biomarker trends. Quality is the cheapest lever before you increase doses.