Independent supplement ratingsUS and Canada · Updated weekly
A ratings desk for a category that has spent thirty years grading its own homework.
A ratings desk for a category that has spent thirty years grading its own homework.
Premium, tested, and priced like it. Our plain read on how transparent they are about doses and testing — and what their products actually scored.
Thorne is one of the few supplement companies whose marketing is duller than its products, which in this category counts as a compliment.
Labels are fully disclosed. Doses are stated per ingredient, elemental figures are given where they matter, and we have not had to guess at a formula to rate one of their products — which is more than we can say for most of the brands in our rankings. There are no proprietary blends hiding the interesting numbers.
A large part of Thorne's catalogue carries NSF Certified for Sport certification, the strictest of the common third-party marks and the one that matters if you are drug-tested. That is a real, checkable claim: certified products appear in NSF's public register, so you can verify a specific product rather than trusting a logo. What the seals actually mean →
Price. Thorne products are consistently among the most expensive per serving in their category, and the gap is bigger than the quality gap. In magnesium specifically, you can buy a well-dosed, well-absorbed glycinate for a fraction of the price per serving. Paying more for a clean label is defensible; paying three times more is a choice, not a requirement.
Scored on the same public formula as every other product on this site. See the method →
A brand page is not an endorsement, and no brand can pay to appear here or to change what it says. We rate labels and doses, not companies' intentions. Advertising disclosure →