How do you know if a supplement is good quality?

Use five checks. Look for independent testing for purity and potency, and a recognized mark such as NSF, USP, ConsumerLab, Informed Sport or IFOS. Ask for a batch Certificate of Analysis. Match the form and dose used in studies, and use blood testing when it can set the dose. The criteria matter more than any one brand.

What's the most important quality signal?

Third-party testing. Independent testing for purity and potency is the baseline filter.

Beyond the seal, what should I check?

The Certificate of Analysis (COA) for that batch, which reveals contaminants and fillers. Ask for one and read it.

Does the form of the supplement matter?

Yes. Triglyceride-form omega-3 with an IFOS oxidation check is one example, and gummies often fall short of their labeled dose, so a powder is usually the better pick.

How do I know the dose is right for me?

Blood testing personalizes the dose, since individual needs vary widely and a label can't tell you what you need.

How to Know If a Supplement Is Good Quality

What the evidence says

positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.

1
Leaning for
Independent testing and a recognized mark such as NSF or USP show whether a supplement is good quality.

3 sources: 1 positive, 2 partly.
Researchers say

1 positive, 2 partly

Mark Hyman, on The Dr. Hyman Show, at 27:06

Positive Video · Opinion

“look for supplements that have been independently tested by Third parties like the NSF International or USP pharmacopia or consumer lab”

Open the tape at 27:06 →

Darren Candow, on FoundMyFitness, at 1:48:19

Partly Video · Opinion

“if it has third partyy test it safe”

Open the tape at 1:48:19 →

Dr Michael Ruscio, on Rangan Chatterjee's channel, at 57:36

Partly Video · Opinion

“that a company is periodically having a third-party test their probiotics to make sure that what is on the label matches what's in the probiotic.”

Open the tape at 57:36 →
Studies show

No study counted yet.
7 more not counted · see why
A host's remark inside an interview. 3

Rhonda Patrick · FoundMyFitness 1:24:43

Peter Attia · The Drive 38:02

Andrew Huberman · Huberman Lab 1:45:37
We could not confirm who is speaking. 2

Rangan Chatterjee's channel 32:36

The Drive 1:36:11
We could not tell what position it takes on this claim. 1

Bryan Johnson's channel 13:11
We could not tell where the evidence comes from. 1

Huberman Lab 29:42
Show the receipts from 3 sources
1. Mark Hyman, on The Dr. Hyman Show, at 27:06 Video · positive · Opinion
  
  “look for supplements that have been independently tested by Third parties like the NSF International or USP pharmacopia or consumer lab”
2. Darren Candow, on FoundMyFitness, at 1:48:19 Video · partly · Opinion
  
  “if it has third partyy test it safe”
3. Dr Michael Ruscio, on Rangan Chatterjee's channel, at 57:36 Video · partly · Opinion
  
  “that a company is periodically having a third-party test their probiotics to make sure that what is on the label matches what's in the probiotic.”

Where the sources disagree

Leaning for

Independent testing and a recognized mark such as NSF or USP show whether a supplement is good quality.

Supports it 1 source: Mark Hyman, on The Dr. Hyman Show, at 27:06

Positive Video · Opinion

“look for supplements that have been independently tested by Third parties like the NSF International or USP pharmacopia or consumer lab”

Open the tape at 27:06 →
Partly 2 sources: Darren Candow, on FoundMyFitness, at 1:48:19

Partly Video · Opinion

“if it has third partyy test it safe”

Open the tape at 1:48:19 →

Dr Michael Ruscio, on Rangan Chatterjee's channel, at 57:36

Partly Video · Opinion

“that a company is periodically having a third-party test their probiotics to make sure that what is on the label matches what's in the probiotic.”

Open the tape at 57:36 →

Precis is not affiliated with or endorsed by YouTube or by any researcher, show or publisher we quote. We take no sponsorship, ad or affiliate money, and every verdict is our own review of what was said. How we stay independent

Detailed Answer

Independent testing and a recognized mark such as NSF or USP show whether a supplement is good quality. The sources on the record don't agree on every supplement, but they share a consistent checklist for judging any product.

1. Start with independent testing

First, is it third-party tested? Andrew Huberman's rule, on his own show, is to favor brands tested for purity, potency and lack of contaminants, and to avoid products with unnecessary fillers or binders. Rhonda Patrick calls sourcing the biggest safety risk in the industry.

Without pre-market regulation, testing is the only outside check that the label is true.

2. Check the mark and the batch

Second, does it carry a recognized mark? The ones named on the record are NSF, USP and ConsumerLab, Informed Sport for batch and heavy-metal testing, and IFOS for fish oil. Third, can you see a Certificate of Analysis?

Peter Attia and Mark Hyman both push past the seal to the batch-level COA, the lab report that exposes contaminants and fillers in the specific lot you buy.

3. Check the form and dose

Fourth, is it the right form at a real dose, without junk? Patrick specifies the triglyceride form of omega-3 with an oxidation check. Lauren Colenso-Semple, a guest on Huberman's show, says gummy supplements often don't contain the dose they claim.

Bryan Johnson looks for clinical doses and full ingredient transparency, though he states those criteria while contrasting his own product, so take the standard, not the brand. Fifth, personalize the dose. The right amount varies widely between people, so blood testing beats guessing from a label.

Criteria, not a favorite brand

In an unregulated market, that is the whole job. Verify the product is what it says (tested, certified, COA available). Make sure it is a useful form and dose without fillers, and match the amount to your own body.