How Do You Know If a Supplement Is Actually Good? Testing, COAs, Certifications—and What They Don’t Tell You
Something unexpected has happened since I introduced Specialized Collagen Peptides.
People aren't only asking me what's in it.
They're asking me how I know what's in it.
I've been asked about independent laboratory testing. I've been asked about Certificates of Analysis. I've been asked about finished-product testing.
And more than once now, I've been asked:
“Is it USP certified?”
At first, I was a little surprised by the level of scrutiny.
Then I thought about it.
If you're going to put something into your body every day, these are actually pretty reasonable questions.
But they lead to a much bigger question:
How do you actually know whether a supplement is good?
Is it the laboratory report?
A USP or NSF logo?
The ingredients?
Clinical studies?
Customer reviews?
Or ultimately whether you take the product for an appropriate amount of time and say, “You know what? I actually think this is helping me.”
Unfortunately for anyone looking for one easy checkbox, no single one of those things tells you everything.
First Question: Does the Product Match What the Label Claims?
This seems like the obvious place to start.
If a supplement says it contains a particular ingredient at a particular amount, you should have reasonable confidence that you're actually getting it.
Dietary supplements in the United States are subject to FDA Current Good Manufacturing Practice requirements. Those regulations address specifications involving identity, purity, strength, composition and limits on contaminants, along with manufacturing and quality-control procedures.
That's important.
But it also brings us to a phrase consumers encounter constantly:
“Third-party tested.”
That sounds reassuring.
And it can be.
But my next question is:
Tested for what?
Heavy metals?
Microbiology?
Ingredient identity?
Potency?
Pesticides?
Did the laboratory test the raw ingredient before it went into the formula?
Or did it test the finished product you're actually going to consume?
Those aren't all the same test, and they don't answer the same questions.
A heavy-metals test can tell you something very important about heavy metals.
It doesn't necessarily prove that every ingredient on the Supplement Facts panel is present at its declared amount.
That's why I think consumers should go one step beyond seeing the words “third-party tested.”
Ask what was actually tested.
A COA Is Useful—But What COA Are We Talking About?
COA stands for Certificate of Analysis.
Again, context matters.
A raw-material COA can provide information about an ingredient before it goes into the finished formula.
Finished-product testing evaluates the actual product after the ingredients have been combined and manufactured.
Both can be valuable.
But if what you really want to know is whether the supplement you're buying meets its finished-product specifications, seeing a laboratory report for one of the raw ingredients doesn't necessarily answer that question.
This is something I've become increasingly sensitive to as a formulator.
Don't just ask whether something was tested. Ask what the test actually establishes.
A Laboratory Can't Make a Bad Formula Good
Now suppose a laboratory confirms that a supplement contains exactly the amount of an herbal ingredient printed on the label.
Great.
We're finished, right?
Not necessarily.
Let's use Tongkat Ali as an example.
Simply telling me that a product contains Tongkat Ali doesn't answer everything I want to know.
What kind of material is it?
Is it root powder or an extract?
What's the concentration?
Is it standardized to particular constituents?
How much are we getting?
And perhaps most importantly:
Is it comparable to the ingredient and dose used in the research being cited?
Botanical ingredients can naturally vary. Growing conditions, source material and manufacturing can all influence the finished ingredient.
This is one reason I often find standardized ingredients attractive.
Take something like Pycnogenol®, a standardized French maritime pine bark extract, or one of the researched standardized forms of curcumin. Now we have a more specifically defined ingredient rather than merely a botanical name on a label.
Standardization doesn't automatically make an ingredient effective.
But it gives us something much more specific and consistent to evaluate.
And that's the bigger point:
Testing can help verify a product specification. It can't automatically validate the thinking behind the formula.
“Clinically Studied” Isn't the End of the Investigation Either
Now we've established what's in the product.
We've looked at the form of the ingredient.
And there's research.
Done?
Still not quite.
I want to know what was actually studied.
Was the research performed on the same ingredient?
At the same dose?
For how long?
Who were the subjects?
What did the researchers actually measure?
Was there an appropriate placebo or control group?
And I also want to know who paid for the research.
This last part requires some balance.
Companies that develop specialized ingredients have a financial incentive to fund research on them. Without industry funding, some ingredients might never receive meaningful clinical research at all.
So I don't automatically throw out a study because an ingredient manufacturer funded it.
But I do want that relationship disclosed, and I want to evaluate the research with that information in mind.
And even a well-designed clinical trial is still one piece of evidence—not absolute proof.
Was it a human study, an animal study or laboratory research?
If humans were studied, who were they?
Were they young or old? Trained or untrained? Healthy or dealing with a particular condition?
Does that population actually resemble the person we're trying to help?
What else were they doing during the study?
And does the result mean something useful outside the particular conditions of the experiment?
Those distinctions matter.
A result in a laboratory dish isn't automatically a result in a human body. And a result in one particular group of people doesn't automatically tell us what will happen in every other population.
That's why I don't think the words “clinically studied” should end the conversation.
Research gives us evidence. It doesn't relieve us of the responsibility to interpret that evidence.
So What About USP, NSF and All Those Certification Logos?
Now we arrive at the question that started this whole discussion.
USP and NSF are two recognizable examples of independent supplement verification and certification programs.
They aren't the only quality programs available, and different programs may evaluate different things.
USP's voluntary Dietary Supplement Verification Program includes manufacturing-facility audits, review of manufacturing and quality-control documentation, laboratory testing and continued off-the-shelf testing. A product that successfully completes the program can display the USP Verified Mark.
NSF offers its own dietary-supplement certification programs. Its product certification can include label-claim review, testing and contaminant evaluation, while programs such as NSF Certified for Sport® add screening particularly relevant to competitive athletes.
Those are meaningful trust signals.
But there's an important distinction that sometimes gets lost:
Certification is evidence. It isn't the entirety of the evidence.
USP itself points out that its verification program does not comprehensively determine whether a dietary supplement is effective.
That's a big distinction.
A certification can tell me important things about quality.
It can't tell me whether someone designed a brilliant formula in the first place.
Yes, Certifications Are Also Marketing
I don't mean that negatively.
Trust has value.
Consumers can't visit every manufacturing facility. They can't independently analyze every bottle. They can't audit every ingredient supplier.
So independent organizations provide a valuable service: they establish standards, perform audits or testing, and allow qualifying companies to communicate that verification.
Companies pay to participate in certification and verification programs.
That doesn't mean they're simply buying a passing grade.
They're paying for the evaluation process and, if they meet the requirements, the ability to communicate that accomplishment.
And naturally, companies market it.
Why wouldn't they?
A recognizable certification mark can help a company demonstrate quality and give a customer an immediate reason for greater confidence.
A certification can be both a quality signal and a trust signal.
The mistake is turning that signal into something it doesn't actually establish.
A certified product isn't automatically effective.
And the absence of one particular certification doesn't automatically establish that a product is poor quality.
You have to keep asking questions.
Think About an Organic Tomato
Here's a simple way I think about certification.
Imagine I grow tomatoes in my backyard using practices consistent with organic agriculture.
I carefully choose what goes into the soil. I avoid prohibited pesticides. I know exactly how those tomatoes were grown.
But I never pursue an official organic certification.
The absence of a certified-organic seal doesn't suddenly tell you that the tomato was poorly grown.
But certification would add something valuable:
Independent verification.
Instead of simply telling you, “Trust me, I grew it this way,” a certification gives you an outside party evaluating whether defined requirements were actually met.
That's how I think consumers should view supplement certifications too.
They're valuable.
They're just not the only way to learn something meaningful about a product.
Small Companies Have to Decide Where to Put Their Quality Dollars
There's also a practical business reality here.
A large company selling enormous quantities of a product can spread the expense of testing and multiple certification programs across a huge number of units.
A smaller company has to make choices.
Do I pursue another consumer-facing certification?
Do I spend more on independent laboratory testing?
Do I select a more expensive researched ingredient?
Do I perform additional finished-product testing?
Ideally, we'd have unlimited resources and do everything imaginable.
Small businesses don't have unlimited resources.
That isn't an excuse to cut corners.
It means that instead of simply counting the logos on a package, I think consumers should ask:
What did this company actually do?
What We're Doing With Specialized Collagen Peptides
So I'll apply exactly the same standard to my own product.
Epoch Nutrition Sciences Specialized Collagen Peptides does not currently carry a USP Verified or NSF Certified mark.
I don't want to blur that distinction or suggest that another quality measure is somehow the same certification.
I'd rather tell you what we've actually done.
Specialized Collagen Peptides is manufactured in an SQF-certified facility.
The finished Specialized Collagen Peptides product has also been independently analyzed by High Desert Analysis. Its Certificate of Analysis reports testing of the key listed components of the formula—including FORTIGEL®, TENDOFORTE®, VERISOL®, Mobilee®, Native Type II Collagen and vitamin C—with the listed specifications receiving passing results.
The finished product was also evaluated for microbiological specifications and several heavy metals, with the reported tests receiving passing results.
Additional independent testing through Eurofins is also part of our quality process.
But here's why I don't think a laboratory report ends the conversation.
I'm interested in both sides of the quality equation.
I want evidence that the finished product meets its specifications. I want appropriate testing related to product quality and contaminants.
But I still have to ask whether I selected meaningful ingredients, whether they're included in meaningful amounts, and whether there's relevant research behind them.
A laboratory report can't rescue a poorly conceived formula.
And a great formula on paper doesn't excuse inadequate quality control.
I want both.
Maybe We Should Ask These Questions About Lunch
There's one thought that keeps occurring to me as people ask increasingly sophisticated questions about supplements.
What if we applied this level of curiosity to everything else we put into our bodies?
Where did it come from?
How was it produced?
What's actually in it?
How consistent is it?
What do we know about consuming it regularly?
We can become incredibly diligent about investigating a supplement we're considering specifically because we're trying to take better care of ourselves—and then sometimes give considerably less thought to foods and beverages we consume every day.
I'm certainly not suggesting that we should scrutinize supplements less.
Quite the opposite.
Maybe we should scrutinize some of the other things a little more.
If you're considering one of my products, I welcome the scrutiny.
I'd much rather have an informed customer asking good questions than someone buying something because the front of the package looked impressive.
Then There's the Question No Certification Can Completely Answer
Eventually, there's another question:
Is the product actually doing something useful for you?
Research helps us decide whether something is worth trying.
Ingredient quality matters.
Dose matters.
Testing matters.
Manufacturing matters.
But eventually you're the person taking it.
Customer reviews and testimonials can provide useful real-world information, particularly when consistent patterns develop over time.
But they're not clinical trials.
Individual experiences can be influenced by expectations, lifestyle, training, diet and many other variables.
So I wouldn't use testimonials to prove that a supplement works.
I also wouldn't pretend that real-world customer experience is meaningless.
And you need to give a product an appropriate opportunity to demonstrate whatever benefit you're looking for.
With specialized collagen peptides and connective tissue, for example, some of the research we've discussed elsewhere evaluated supplementation over approximately 12 weeks.
That doesn't mean everybody gets a result on Day 90.
It means judging a connective-tissue product after a few days probably isn't a particularly useful experiment.
We've gone into that subject separately in our article about how long collagen takes to work for joints and tendons.
So How Do I Evaluate a Supplement?
After more than three decades working with training and nutrition—and now formulating supplements—I don't think there's one magic test.
I want to know:
Does the product match what the label claims?
Has it been appropriately manufactured and evaluated for relevant quality and safety specifications?
Are the ingredients themselves good ingredients—not merely impressive names on a label?
Are they in meaningful forms and amounts?
What does the research actually say?
Does that research actually apply to the ingredient, dose and population I'm interested in?
Are there conflicts of interest or limitations I should understand?
What does independent testing or certification actually verify?
And finally, after I've given the product a reasonable opportunity:
Is it earning its place in my routine?
A certification doesn't tell me everything.
A COA doesn't tell me everything.
A clinical study doesn't tell me everything.
And a five-star testimonial certainly doesn't tell me everything.
Each gives me another piece of information.
Quality isn't one checkbox. It's the weight of the evidence.
Michael Wohltmann, CSCS, ACSM-EP
President, Epoch Nutrition Sciences
Frequently Asked Questions
What does third-party tested mean for a supplement?
It means an outside laboratory or organization performed testing, but the phrase alone doesn't tell you what was tested. Ask whether testing covered identity, potency, microbiology, heavy metals, contaminants or the finished product.
What is a COA for a supplement?
A Certificate of Analysis reports results for specified tests performed on an ingredient or finished product. A raw-material COA and a finished-product COA answer different questions.
Does a supplement need to be USP certified to be high quality?
No. USP verification is a voluntary third-party verification program and can provide a valuable quality signal, but the absence of the USP Verified Mark does not by itself establish that a supplement is poor quality.
What's the difference between USP and NSF certification?
USP and NSF operate different independent verification and certification programs with their own requirements. Consumers should look at what a particular certification actually evaluates rather than assuming all certification marks mean the same thing.
Does third-party testing prove that a supplement works?
No. Testing can provide important information about identity, potency, quality or contaminants depending on the tests performed. Effectiveness is a separate question involving ingredient selection, dose, research and individual response.
Is Epoch Specialized Collagen Peptides third-party tested?
Yes. The finished product has undergone independent laboratory analysis covering key listed formula components as well as microbiological specifications and several heavy metals, with the reported specifications receiving passing results.
References & Further Reading
U.S. Food & Drug Administration — Current Good Manufacturing Practice for Dietary Supplements. FDA guidance explaining dietary-supplement CGMP requirements, including specifications related to identity, purity, strength, composition and contaminants.
FDA Dietary Supplement CGMP Guidance
United States Pharmacopeia — Dietary Supplement Verification Program. Information about USP's voluntary third-party verification program and what the USP Verified Mark represents.
USP Dietary Supplement Verification Program
United States Pharmacopeia — Verification Services FAQs. Explanation of what USP verification does and does not establish, including the distinction between quality verification and evidence of efficacy.
USP Verification Services FAQs
NSF — Dietary Supplement and Vitamin Certification. Overview of NSF dietary-supplement certification and the types of product-quality questions these programs address.
NSF — Product and Ingredient Certification. Information about NSF/ANSI 173 and dietary-supplement product and ingredient certification.
NSF Product and Ingredient Certification
Safe Quality Food Institute — Dietary Supplement Manufacturing. SQF requirements and guidance relevant to dietary-supplement manufacturing facilities.
High Desert Analysis — Certificate of Analysis: Specialized Collagen Peptides, July 31, 2026. Independent finished-product analysis commissioned by Epoch Nutrition Sciences. The report includes testing of listed formula components, microbiological specifications and several heavy metals.
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