Foundational supplement guides

Every foundational guide we've published, graded by the strength of the human trial evidence behind it.

FoundationalModerate evidence

Vitamin D3: when supplementing actually moves the needle

Genuinely useful if you're deficient, mostly irrelevant otherwise. Knowing which one you are is the whole trick.

8 min readRead guide

FoundationalModerate evidence

Omega-3 (EPA/DHA): fish oil that isn't a waste of money

Most fish oil sold is underdosed. Here's what the actual trial doses look like and why the ratio on the label matters.

10 min readRead guide

FoundationalModerate evidence

Magnesium glycinate: the form matters more than the marketing

Magnesium is genuinely under-consumed, but which compound you buy determines whether it helps or just sends you to the bathroom.

8 min readRead guide