Guides
Plain-English, evidence-based answers on supplements and over-the-counter products — every claim cited to NIH, PubMed, or FDA sources. Pick a topic to jump straight to it.
Vitamins & Minerals
Ingredient guides and product reviews for the supplements people actually buy.
Omega-3 Fish Oil: Benefits, Dosage, and How to Choose
Fish oil is one of the biggest supplement categories in the world, and also one of…
Read Guide
Zinc: Benefits, Dosage, and Why More Isn’t Better
Zinc is an essential mineral involved in immune function, wound healing, taste and smell, and hundreds…
Read Guide
Vitamin B12: Who Actually Needs to Supplement
Vitamin B12 is essential for nerve function, red blood cell formation, and DNA synthesis — and…
Read Guide
Magnesium Glycinate vs Citrate: Which Should You Take?
Magnesium glycinate and magnesium citrate are two of the most popular magnesium supplements — and they’re…
Read Guide
Magnesium: Benefits, Dosage, and How to Choose a Form
Magnesium is one of the most commonly supplemented minerals, involved in over 300 enzyme reactions in…
Read Guide
Vitamin D3 vs D2: What’s the Difference?
Vitamin D supplements come in two forms — D2 (ergocalciferol) and D3 (cholecalciferol) — and the…
Read Guide
How to Choose a Multivitamin
Multivitamin shelves are crowded with products that look similar but vary enormously in quality. Here’s what…
Read Guide
Thorne Magnesium Bisglycinate Review
This is a research-based review, not a hands-on test — see our editorial policy for how…
Read GuideSleep Aids
What helps you sleep, what doesn’t, and what the studies really show.
Melatonin: Dosage, Safety, and How to Use It Right
Melatonin is the most widely used sleep supplement in the world — and one of the…
Read Guide
Valerian Root for Sleep: What the Evidence Really Shows
Valerian root (Valeriana officinalis) has been used as a calming herb since ancient Greece, and today…
Read Guide
Best Magnesium for Sleep: How to Choose (and Top Picks)
Magnesium is one of the most popular supplements for sleep and relaxation — but the shelf…
Read Guide
Melatonin vs Magnesium for Sleep: Which Should You Take?
Melatonin and magnesium are the two supplements people reach for most when they can’t sleep —…
Read Guide
Ashwagandha: Benefits, Dosage, and Who Should Avoid It
Ashwagandha (Withania somnifera) is an adaptogenic herb used in Ayurvedic medicine for centuries, and it’s become…
Read Guide
L-Theanine Benefits: What the Evidence Actually Shows
L-theanine is a naturally occurring amino acid found in tea leaves (Camellia sinensis) — it’s part…
Read Guide
Natural Sleep Aids vs Melatonin: Which Should You Choose?
Melatonin is the sleep supplement most people reach for first, but it’s not the only option…
Read GuideDigestive & Gut Health
Probiotics, prebiotics, and gut-health claims, examined strain by strain.
Psyllium Husk: The Fiber That Actually Has Evidence
Psyllium husk is the unglamorous workhorse of gut health — a soluble fiber from the seeds…
Read Guide
Best Probiotics for IBS: Which Strains Actually Have Evidence
If you’re shopping for a probiotic to help with IBS, the single most important thing to…
Read Guide
What Are Probiotics? Strains, Evidence for IBS, and Safety
Probiotics are live microorganisms — most commonly bacteria from the Lactobacillus and Bifidobacterium genera, along with…
Read Guide
Prebiotics vs Probiotics: What’s the Difference?
Prebiotics and probiotics get lumped together constantly, but they’re not the same thing — and understanding…
Read Guide
Do Probiotics Help IBS Symptoms? What the Evidence Shows
Probiotics are one of the most commonly tried supplements for irritable bowel syndrome (IBS), and the…
Read Guide
Align Probiotic Review
This is a research-based review, not a hands-on test — see our editorial policy for how…
Read Guide