Why Heavy Metal Testing Matters for Supplement Brands

At SREKE, we understand that heavy metal contamination is one of the most critical compliance challenges facing dietary supplement manufacturers today. With FDA enforcement actions increasing and global regulators tightening limits on lead, arsenic, cadmium, and mercury in finished products, brand owners must prioritize rigorous testing throughout their supply chain.

Heavy metals can enter supplements through raw ingredients sourced from contaminated soil, water, or processing equipment. Plant-derived ingredients, botanical extracts, and mineral supplements carry particular risk. Without comprehensive testing protocols, even well-intentioned brands face product recalls, regulatory warnings, and reputational damage that can shut down a business overnight.

Our manufacturing facility in Guangzhou implements multi-layered heavy metal testing at every stage — from incoming raw material verification to finished product release. We work with accredited third-party laboratories following USP <232> and <233> procedures, ensuring your products meet the strictest safety standards before they reach consumers.

Key Manufacturing Considerations at SREKE

Raw Material Verification

• Every incoming ingredient undergoes heavy metal screening before acceptance into our GMP facility
• We require Certificates of Analysis (CoA) from suppliers, verified against our own testing protocols
• Lot-by-lot testing ensures consistency across production batches

Testing Standards We Follow

• USP <232> Elemental Impurities — limits for lead, arsenic, cadmium, and mercury in drug and supplement products
• USP <233> Determination of Elemental Impurities — ICP-MS and ICP-OES analytical methods
• California Proposition 65 compliance limits for brands selling in the US market
• EFSA and EU food supplement regulations for European distribution

Our Quality Control Process

At SREKE, we maintain documented SOPs for heavy metal testing that align with ISO 22000 and HACCP principles. Our quality team reviews every CoA, cross-references results against specification limits, and flags any outliers for investigation. We do not release materials until testing confirms compliance with our published specifications.

Formulation and Packaging Options

We manufacture softgels, capsules, tablets, powders, gummies, and liquids — each format requires specific testing protocols. Our formulation team works with your specifications to ensure ingredient selection minimizes heavy metal risk while maintaining product efficacy and stability.

How SREKE Helps You Get to Market Faster

Streamlined Compliance

Our GMP-certified facility eliminates the need for brands to manage complex testing logistics. We handle incoming material verification, in-process testing, and finished product release — providing you with complete documentation for regulatory submissions.

MOQ Flexibility

SREKE offers competitive minimum order quantities for both OEM and ODM programs. Whether you are launching a new brand or scaling an existing line, we accommodate orders that match your production needs without compromising quality standards.

Lead Time Management

Our streamlined manufacturing process reduces time-to-market. From formulation development to final packaging, we coordinate each step to meet your launch timeline. Typical production lead times range from 4 to 8 weeks depending on product complexity and packaging requirements.

Documentation Support

We provide comprehensive documentation packages including CoAs, test reports, GMP certificates, and stability data. Our team supports regulatory filings for FDA registration, EU market entry, and other compliance requirements your brand may need.

Industry Trends and Market Opportunities

Increasing Regulatory Scrutiny

The dietary supplement industry faces growing regulatory pressure worldwide. FDA inspections have increased, and third-party certification programs like NSF Certified for Sport and USP Verified are becoming table stakes for competitive brands. Consumers demand transparency about product safety, and heavy metal testing is central to that expectation.

Private Label Growth

Private label supplement brands continue to expand as entrepreneurs enter the market. These brands rely on contract manufacturers like SREKE to manage compliance, testing, and production — allowing them to focus on marketing and distribution. Our ODM program offers pre-formulated products that meet current safety standards, reducing development time for new brands.

Global Market Access

Brands targeting international markets must navigate varying regulatory requirements. Our facility maintains compliance with GMP standards recognized in the US, EU, and Asia-Pacific regions. We support multilingual labeling and packaging requirements for global distribution.

Frequently Asked Questions

What heavy metals do you test for in supplement manufacturing?

At SREKE, we test for the four elemental impurities specified in USP <232>: lead, arsenic, cadmium, and mercury. We also screen for additional metals including aluminum, barium, and nickel based on your product specifications and target market requirements.

How does SREKE verify raw material safety?

We require Certificates of Analysis from all suppliers and verify results through our own testing protocols. Incoming materials undergo screening before acceptance into our GMP facility. We maintain lot traceability and document all testing results for quality records.

What is the MOQ for heavy metal testing at SREKE?

Heavy metal testing is included in our standard manufacturing process — there is no separate MOQ for testing. Our MOQ applies to production orders, which vary by product format. Contact our team for specific quantity requirements for softgels, capsules, tablets, powders, gummies, or liquids.

Can SREKE help with FDA registration and compliance?

Yes. Our team supports facility registration, product listing, and GMP compliance documentation. We provide test reports and Certificates of Analysis that support regulatory submissions for the US market and other regions.

What is the typical lead time for supplement production?

Production lead times at SREKE typically range from 4 to 8 weeks, depending on product complexity, packaging requirements, and order volume. Our team provides detailed timelines during the quoting process.

Does SREKE offer ODM products for new brands?

Yes. Our ODM program includes pre-formulated supplements that meet current safety and compliance standards. This option reduces development time and allows new brands to launch faster with proven formulations.

What certifications does SREKE hold?

SREKE operates a GMP-certified facility in Guangzhou, China. We maintain compliance with ISO 22000, HACCP principles, and FDA registration requirements. Our quality system supports testing protocols aligned with USP standards.

Ready to launch your supplement brand? SREKE provides GMP-certified OEM/ODM manufacturing for softgels, capsules, tablets, powders, gummies, and liquids. Contact us for a free quote or email [email protected] — we respond within 24 hours.