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.
Loud marketing, quiet labels. Our plain read on how transparent they are about doses and testing — and what their products actually scored.
BiOptimizers is a direct-to-consumer operation first and a supplement company second, and its labels reflect the order of those priorities.
This is where we have a problem. Their best-known product combines seven forms of magnesium and markets that variety as the benefit — but declares a total magnesium figure without splitting the dose per form. So you cannot tell whether you are getting a meaningful amount of a well-absorbed form or a decorative sprinkle on top of something cheap. Under the labelling rules a brand is allowed to do this; that does not make it informative. Why the per-form split matters →
There is no research showing that a blend of seven magnesium forms outperforms an adequate dose of one well-absorbed form. The variety is a story, not a finding.
Expect countdown timers, bundle upsells, aggressive email sequences and subscription defaults. None of that is illegal or unusual in DTC, and none of it is evidence about the product — but it is worth knowing what you are stepping into before you enter a card number. How subscription funnels are built →
It is a real product with a real magnesium dose in it, sold by a real company that ships what it promises. It is not a scam. It is a well-marketed product that costs several times what an equivalent single-form magnesium costs, and its label will not let you check whether the premium buys anything.
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 →