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Buying Guide
A short field guide from our lab. What earns a recommendation, what gets an immediate pass, and the tradeoffs worth making.
Third-party testing
Prefer brands that publish lab results for every batch.
Full disclosure
Every ingredient listed with its amount. No hidden blends.
Vague marketing claims
"Natural" and "clean" are unregulated. Demand lab proof instead.
Opaque supply chains
If you can't trace the ingredient, you can't trust it.
How we verify these claims
Our lab methodology, category by category.
Building the most comprehensive testing database for l-theanine.
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Join the WatchdogsBuying Guide
What matters, what doesn't, and how to separate a trustworthy product from a glossy label.
Five things that matter
Products tested by independent labs you can verify. No lab results means no trust signal.
What is on the label should match what is in the bottle, without inflated actives or hidden fillers.
Heavy metals, pesticides, microbes, and adulterants all need a clean read before a product can earn confidence.
Price per bottle is noisy. Cost per effective serving tells the real story.
The brands worth buying usually share their testing, sourcing, and manufacturing standards without evasive copy.
Before you buy
Run any product through this list before you trust its claims.
Has this product been tested by an independent laboratory?
Does the label list exact ingredient amounts?
Can I verify the company's testing claims?
Are there documented interactions or side effects?
What do independent reviewers say about actual results?
Our standards
Every product we feature has been independently screened in accredited laboratories. No brand sponsorships. No free samples.
