An Insiders Guide to Contract Manufacturer Qualification

Ten questions to ask a cGMP-certified manufacturer to ensure they go beyond the minimum federal manufacturing requirements.

Eric Manfull, Matt Martin

November 18, 2014

7 Min Read
An Insiders Guide to Contract Manufacturer Qualification

Selection of a contract manufacturer is potentially the most important decision a brand owner can make. A contract manufacturer is more than a service provider; it is a partner. This is an important distinction. While a poor service provider may cause frustration, a poor partner can sink a business. Think I’m being overly dramatic? Ask one of the many who have failed a FDA cGMP (current good manufacturing practice) audit, and they will say a lack of a partnership with their contract manufacturer played a significant role in their demise.

Look Beyond Third-party cGMP Certification

It’s a common misconception that all cGMP-certified manufacturers operate with the same or similar levels of cGMP compliance. As with any business or profession, there are varying degrees of experience, expertise and regulatory compliance. For example, just because someone has a degree from a medical school does not mean they are an excellent doctor. It simply means they have met the basic standards required to practice medicine.

The bottom line is that while cGMP certification is one of the first things to look for, it is by no means the only factor to consider. There are plenty of cGMP-certified facilities. Many facilities have the capital and equipment necessary to appear compliant. The key word here is “appear." In order to determine the true level of cGMP compliance, customers and/or potential customers must look beyond third-party certification. In doing so, a brand owner is sure to find dramatic and sometimes unsettling differences between cGMP-certified facilities. 

High-level cGMP compliance for quality finished goods requires a combination of exceptional process/production controls and extensive qualitative/quantitative laboratory testing. One without the other is not enough.

Qualitative and Quantitative Lab Operations

Many customers and/or potential customers are familiar with cGMPs as they relate to the production process. However, many are less than familiar with cGMPs as they relate to laboratory operations.

Here are 10 questions to ask a cGMP-certified manufacturer:

1.            What makes your facility different than other cGMP-certified manufacturers?

Appropriate Response: Testing, testing and more testing. While many companies claim to provide  quality, only a few have the laboratory equipment and expertise to do so. Unfortunately, only a handful of manufacturers perform the extensive raw material and finished goods testing required for high-level cGMP compliance. The proof is in the pudding. Facilities that embrace cGMPs are facilities that go through testing.

2.            Can you estimate the investment your company has made in laboratory equipment and personnel to ensure high level cGMP compliance?

Appropriate Response: While many companies make bold statements about their quality, few have made the large financial investment in laboratory equipment and personnel. cGMPs allow for the use of third-party contract laboratories. However, it's good to also have in-house analytical expertise and experience. A full-scale in-house analytical laboratory expedites and facilitates high-level cGMP compliance.

3.            What are your in-house laboratory capabilities?

Appropriate Response:  Depending on specific needs and product type, a contract manufacturers laboratory should include most, if not all of the following:  

•             UV-Vis (ultraviolet-visible spectrophotometry)

•             HPLC/UPLC (high pressure or ultra-high pressure liquid chromatography)

•             ICP-MS (inductively coupled plasma mass spectrometry); If you sell in California, this is a must-have piece of equipment.

•             GC (gas chromatography)

•             FTIR, Mid-IR and/or NIR (infrared spectroscopy)

•             Drying ovens and/or Karl Fischer titration equipment necessary to determine the moisture/water  content

•             Accelerated stability (shelf life) chambers

•             Microbiological (plating, incubation, etc.)

•             pH meters

•             Brix meters


4.            Do you perform skip lot testing?

Appropriate Response: No. Skip lot and/or supplier qualification involves a schedule of testing wherein a manufacturer may test the first few lots of a raw material(s) received from a supplier. If the materials are within specification, it may consider that supplier qualified. Then, based on the qualified supplier status, facilities may choose to skip testing on some future lots. Skip lot testing is performed to save time and money. A brand owner has to ask itself if the savings is worth the time and expense of an out-of-spec batch or recall.

Additionally, in today’s volatile raw material marketplace, the raw material supplier is not always the raw material manufacturer. Therefore, while a contract manufacturer may have qualified a supplier, it may not have qualified the raw material manufacturer. If the qualified supplier provides material from a different manufacturer, the qualification is worthless. Further, the use of skip lot testing will not identify the material difference until it’s too late, i.e., the blend or finished product is out of specification.

5.            What qualitative tests are performed as part of the raw material and component approval process?

Appropriate Response: Qualitative analysis is performed on all incoming raw materials and components. Routine qualitative tests include, but should not be limited to the following:   

•             FTIR, Mid-IR and/or NIR (infrared spectroscopy)

•             Organoleptic analysis: taste, color, odor, appearance, feel (when applicable)

•             Specific gravity (when applicable)

While not technically qualitative, the following are often lumped into the qualitative category:

•             Brix

•             pH

•             Moisture/water content

•             Mesh size

•             TDS, etc.

6.            What is your protocol for analytical/quantitative analyses of incoming raw materials, i.e., how do you determine the activity and/or purity of raw materials?

Appropriate Response: We perform analytical/quantitative analyses of all incoming vitamins, minerals, standardized botanicals and other materials that carry a potency or activity label claim and/or that contribute to the total amount of another ingredient on the label. For example, guarana contains caffeine. As such, this raw material should undergo a quantitative assay to determine the actual caffeine content. In short, a manufacturer’s standard testing protocol should include a wide variety of quantitative raw material assays to determine that the activity, potency and/or purity are within specifications.

7.            Are you aware of California’s Prop 65, and are you prepared to produce products in accordance with those regulations?

Appropriate Response: Yes, we’re aware, and we have made the investment in ICP-MS. This equipment is able to detect heavy metals such as lead, mercury, arsenic, cadmium and others at parts per million (ppm) and/or parts per billion (ppb) levels, which are necessary to ensure compliance with Prop 65.

8.            What is your standard protocol for microbiological analysis of incoming raw materials?

Appropriate Response:  Full microbial analysis of all incoming raw materials that should include, but may not be limited to the following:  

•             Total aerobic bacteria

•             Staphylococcus

•             E. Coli

•             Salmonella

•             Yeast and mold

•             Coliforms

•             Enterobacteriaceae

9.            What is your procedure for finished goods testing?

Appropriate Response:  A myriad of qualitative and quantitative finished goods testing is performed on all lots. Finished goods testing includes, but should not be limited to the following:

•             High/low quantitative assay on each finished good in order to validate the homogeneity of the blended and previously assayed ingredients. For example: if the formula contains 100 mcg of selenium and 1000 mg of calcium, a lab would like to see a quantitative finished goods assay for each of those ingredients because it provides some validation to the blend uniformity.

•             FTIR mid-IR and/or NIR (infrared spectroscopy)

•             Organoleptic analysis: taste, color, odor, appearance and feel (when applicable)

•             Microbiological analysis:

                o             Aerobic bacteria, staphylococcus, E. coli, salmonella, yeast, mold, coliforms,        enterobacteriaceae, sometimes pseudomonas and/or others as necessitated by the formulation       and its components

•             Viscosity (when applicable)

•             pH

•             Specific gravity

•             Brix

10.          Will we be provided with copies of the raw material and finished goods test results, and may we see examples of the raw material, in-process and finished goods testing that have been performed within the last week?

Appropriate Response: Yes, we’d be happy to provide you with copies. Please note that you should receive tests results for raw materials, in-process goods and finished goods. 

Choosing the right contract manufacturer and maintaining a solid partnership is critical for supplement companies navigating the challenging regulatory and consumer market. For more on the topic, visit INSIDER’s Contract Manufacturing Content Library.

Matt Martin ([email protected]), is president and partner of Healthy Solutions LLC, a liquid supplement manufacturer.

Eric Manfull is partner, chief operating officer (COO) and senior engineer at Healthy Solutions LLC.

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