Why Dissolution Testing Matters for Supplement Brands

At SREKE, we understand that dissolution testing is one of the most critical quality control steps in tablet and capsule manufacturing. It measures how quickly and completely your active ingredients release from the dosage form into solution — a direct indicator of bioavailability and product performance.

Dissolution testing is required under FDA 21 CFR Part 111 (Current Good Manufacturing Practice for Dietary Supplements) and is a standard expectation for EFSA-compliant products entering the European market. Brands that skip or cut corners on this testing risk product failure, batch rejections, and costly recalls down the line.

For supplement brand owners, dissolution data supports three essential outcomes:

• Bioavailability assurance: Confirms your active ingredients are released at rates consistent with label claims.
• Regulatory compliance: Meets FDA, Health Canada, and TGA requirements for dietary supplement manufacturing.
• Batch-to-batch consistency: Ensures every unit performs the same way, protecting your brand reputation.

What Dissolution Testing Actually Measures

Dissolution testing evaluates the rate and extent to which an active pharmaceutical ingredient (API) or botanical extract dissolves from its dosage form under controlled conditions. The test uses a dissolution apparatus — typically USP Apparatus 1 (basket) or Apparatus 2 (paddle) — immersed in a specified volume of dissolution medium at a defined temperature (usually 37 ± 0.5°C, simulating human body temperature).

Samples are withdrawn at predetermined time intervals and analyzed, commonly via UV-Vis spectrophotometry or HPLC, to quantify the amount of active ingredient released. Results are expressed as a percentage of the labeled claim dissolved over time.

Why It Is Non-Negotiable for GMP Manufacturers

Under FDA 21 CFR §111.165, manufacturers must establish written specifications for component, packaging, and finished-product specifications, including acceptance criteria. Dissolution testing is the primary method for verifying that finished tablets and capsules meet those criteria. EFSA similarly requires that food supplement products demonstrate adequate bioavailability of their declared ingredients.

At SREKE, our GMP-certified facility in Guangzhou performs dissolution testing on every batch of tablets and capsules we produce. We maintain full documentation traceable to each lot, ready for your regulatory audits or third-party lab verification.

Key Manufacturing Considerations at SREKE

Dissolution Method Development

At SREKE, our in-house QA team develops and validates dissolution methods tailored to each formula. No two supplements behave identically — a highly soluble mineral salt like magnesium citrate requires different conditions than a lipophilic botanical extract like curcumin or resveratrol. Our method development considers:

• Dissolution medium: We use physiologically relevant media including 0.1N HCl, phosphate buffers (pH 4.5, 6.8), and simulated gastric or intestinal fluids where appropriate.
• Apparatus selection: USP Apparatus 1 (basket, 100 rpm) or Apparatus 2 (paddle, 50–75 rpm) depending on tablet density and formulation characteristics.
• Temperature control: Maintained at 37 ± 0.5°C per USP <711> Dissolution guidelines.
• Sampling intervals: Typically 10, 20, 30, 45, and 60 minutes, optimized per product.
• Acceptance criteria: We typically target Q ≥ 75% dissolved within 30 minutes for immediate-release tablets, per USP general chapter <711>.

Factors That Influence Dissolution Performance

Several formulation and manufacturing variables directly affect dissolution results. At SREKE, we optimize each of these during the development phase to ensure your product performs reliably at scale.

• Excipient selection: Binders, disintegrants (e.g., croscarmellose sodium, sodium starch glycolate), and lubricants (e.g., magnesium stearate) all impact how rapidly a tablet breaks apart and releases its actives. Excess magnesium stearate, for instance, can create hydrophobic barriers that retard dissolution.
• Compression force: Higher tablet hardness improves stability but can reduce dissolution rate. We find the optimal balance during scale-up.
• Particle size of actives: Micronized or nano-sized ingredients dissolve faster. We collaborate with your supply chain or source from verified vendors to ensure consistent particle distribution.
• Coating formulation: For film-coated or enteric-coated tablets, coating thickness and polymer type (e.g., HPMC, Eudragit) are critical. Enteric coatings must remain intact in simulated gastric fluid (pH 1.2) and dissolve in simulated intestinal fluid (pH 6.8).
• Capsule shell composition: For hard-shell capsules, we test both gelatin and HPMC (vegetarian) shells for disintegration time, which typically must be under 30 minutes per USP <701>.

Quality Standards We Follow

At SREKE, all dissolution testing is conducted in compliance with the following standards:

• USP <711> Dissolution: The definitive pharmacopeial method for dissolution testing of tablets and capsules.
• USP <701> Disintegration: Required for immediate-release solid oral dosage forms.
• 21 CFR Part 111: FDA cGMP regulations for dietary supplements.
• ISO 9001:2015: Our quality management system certification.
• HACCP: Hazard Analysis and Critical Control Points for food-grade supplement manufacturing.
• EFSA Guidelines: European Food Safety Authority requirements for supplement label claims and bioavailability evidence.

Stability Testing and Dissolution

Dissolution testing is not a one-time check. At SREKE, we conduct stability-indicating dissolution studies per ICH Q1A(R2) guidelines. Products are tested under accelerated (40°C/75% RH) and long-term (25°C/60% RH) conditions at 0, 3, 6, and 12 months. This ensures your product maintains dissolution performance throughout its shelf life — a requirement for both FDA registration and EU market access.

How SREKE Helps You Get to Market Faster

Streamlined OEM/ODM Workflow

At SREKE, we have built our entire OEM and ODM process around speed without sacrificing compliance. From initial consultation to final packaging, our typical timeline is structured to minimize your time to market:

• Formulation development (2–4 weeks): Our R&D team works with your specifications or develops custom formulas, including preliminary dissolution method screening.
• Prototype and testing (2–3 weeks): We produce pilot batches and conduct full dissolution, disintegration, and stability testing.
• Regulatory documentation (1–2 weeks): We prepare all required documentation, including COAs, test reports, and GMP certificates for your records.
• Production and QC (3–6 weeks): Full-scale manufacturing with in-process and final-product dissolution testing on every batch.
• Packaging and shipping (1–2 weeks): Custom packaging options including bottles, blisters, and sachets.

Flexible MOQ for Every Brand Size

We understand that supplement brands operate at every stage. At SREKE, our MOQ for tablet and capsule OEM/ODM programs is designed to be accessible:

• Tablets: Starting at 10,000 units per SKU for private-label programs; custom formulation projects may have customized MOQ.
• Capsules: Starting at 5,000 units per SKU for standard hard-shell capsule programs.
• Softgels: Starting at 5,000 units per SKU.

We also offer flexible batch sizing for repeat orders, allowing you to scale production as demand grows.

Comprehensive Compliance Support

At SREKE, we don't just manufacture — we ensure your product is compliant before it leaves our facility. Our compliance package for every order includes:

• Batch-specific Certificate of Analysis (COA) with dissolution results
• GMP certification from our Guangzhou facility
• Third-party lab verification available upon request
• Full ingredient traceability from raw material to finished product
• Support documentation for FDA DSHEA compliance and EU food supplement registration

Custom Packaging Solutions

Our in-house packaging team supports a wide range of options to match your brand identity and market requirements:

• HDPE bottles with child-resistant caps
• Aluminum blisters for moisture-sensitive formulas
• Unit-dose sachets for powders and single-serve formats
• Custom label design and regulatory-compliant ingredient listing
• Private-label and white-label packaging available

Industry Trends and Market Opportunities

Growing Demand for Bioavailability-Backed Products

The global dietary supplement market is projected to reach approximately $320 billion by 2027, with consumers increasingly demanding products with clinically demonstrated bioavailability. A 2023 report by the Natural Products Enterprise Institute highlighted that brands providing dissolution and bioavailability data see higher consumer trust and repeat purchase rates. At SREKE, we see this trend reflected in every inquiry we receive — brand owners want proof, not just promises.

Enteric-Coated and Delayed-Release Formulations

There is rising demand for enteric-coated tablets and delayed-release capsules, particularly for probiotics, omega-3s, and acid-sensitive botanicals. These formulations require rigorous dissolution testing in both simulated gastric fluid (pH 1.2) and simulated intestinal fluid (pH 6.8) to verify that the coating remains intact until it reaches the intended release site. At SREKE, we have extensive experience developing and validating these specialized dosage forms.

Plant-Based and Vegan Capsule Shell Options

The shift toward vegetarian and vegan supplements continues to drive demand for HPMC (hydroxypropyl methylcellulose) capsule shells over traditional gelatin. HPMC shells must meet the same disintegration and dissolution standards as gelatin shells per USP <701>, and our facility is fully equipped to manufacture both. This segment is growing at approximately 8–10% annually in the North American and European markets.

Personalized and Precision Nutrition

Personalized nutrition is one of the fastest-growing segments in the supplement industry. At SREKE, we support small-batch production runs and custom dosing formats that enable brands to offer tailored supplement solutions. Our flexible manufacturing lines and low MOQ options make it feasible to produce specialized formulas without the traditional barriers of high minimum orders and long lead times.

Regulatory Tightening Globally

Regulatory bodies worldwide are increasing scrutiny on supplement quality claims. The FDA has issued more warning letters related to cGMP violations in recent years, and the EU's Food Supplements Directive requires rigorous documentation of ingredient quality and bioavailability. Brands that partner with GMP-certified manufacturers who perform rigorous dissolution testing are better positioned to meet these requirements and avoid compliance risks.

Frequently Asked Questions

What is dissolution testing and why is it required for supplements?

Dissolution testing measures how quickly and completely the active ingredients in a tablet or capsule release into solution. It is required under FDA 21 CFR Part 111 for dietary supplement manufacturers and is essential for verifying that your product delivers the ingredients listed on the label at the claimed rates. Without dissolution data, you cannot substantiate bioavailability claims or pass regulatory audits.

What is the difference between dissolution testing and disintegration testing?

Disintegration testing (USP <701>) measures how long it takes for a tablet or capsule to break apart into smaller particles. Dissolution testing (USP <711>) measures how much of the active ingredient actually dissolves into the medium over time. Disintegration is a prerequisite for dissolution — a tablet must first break apart before its ingredients can dissolve. At SREKE, we perform both tests on every batch.

How long does dissolution testing take for a new formula?

Method development and validation for a new formula typically takes 2–4 weeks at SREKE. This includes selecting the appropriate dissolution medium, apparatus, and sampling intervals, followed by method validation to confirm accuracy, precision, and specificity. Once the method is established, routine batch testing takes approximately 1–2 hours per batch depending on the number of time points.

Can you help me develop a custom dissolution specification for my product?

Absolutely. At SREKE, our R&D and QA teams work with you to establish custom dissolution specifications tailored to your formula's unique characteristics. Whether you need standard immediate-release criteria or specialized enteric-coated performance profiles, we develop and document specifications that meet your market's regulatory requirements.

What dissolution medium do you use for botanical supplements?

The dissolution medium depends on the solubility profile of your active ingredients. For water-soluble actives, we typically use phosphate buffer (pH 6.8) or simulated intestinal fluid. For poorly soluble botanicals, we may use media with surfactants (e.g., 0.5% SDS) or biorelevant media to better simulate physiological conditions. Our team selects the medium during method development based on your formula's characteristics.

Do you provide dissolution test reports for regulatory submission?

Yes. At SREKE, every batch includes a Certificate of Analysis (COA) with dissolution results, and we can provide detailed test reports suitable for regulatory submission to the FDA, Health Canada, or other authorities. Third-party verification through independent laboratories is also available upon request.

What is your typical lead time for tablet and capsule production?

For standard private-label products, our lead time is approximately 4–6 weeks from order confirmation to shipment. For custom ODM formulations, the timeline is typically 8–12 weeks, including formulation development, testing, and production. We provide detailed timelines during the quoting process so you can plan your launch accordingly.

Do you offer low MOQ programs for emerging supplement brands?

Yes. At SREKE, we offer low MOQ programs starting at 5,000–10,000 units per SKU depending on the dosage form. We understand that emerging brands need flexibility, and our manufacturing lines are designed to accommodate both small initial runs and large-scale production as your brand grows.

Are your facilities certified for international markets?

Yes. SREKE's Guangzhou facility holds GMP certification, ISO 9001:2015 certification, and HACCP certification. Our products comply with FDA 21 CFR Part 111, EU Food Supplements Directive requirements, and Health Canada's Natural Health Products Regulations. We support brands targeting North American, European, and Asian markets.

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.