focus
L-Theanine Focus
One 200 mg dose of L-theanine sped up reaction time about as much as caffeine in a controlled trial. Twelve weeks of...
peptide
Peptide Serum
The best-known peptide in anti-aging skincare cut wrinkle depth in its first trial, but when the FDA's own lab tested it on...
over 40
Supplements for Athletes Over 40
Almost nobody has tested supplements on the 45-year-old who still spars twice a week — but the research on either side of...
magnesium
Magnesium Side Effects
The safety limit for magnesium supplements is 350 mg a day, and it was set on the mildest possible endpoint: loose stools....
daily wellness
How Long for Probiotics to Work
There is no single answer — the trials ran three different clocks. Protection against antibiotic diarrhea shows up within the week, the...
daily wellness
Multivitamin for Men
The two largest multivitamin trials ever run were run on men — 14,641 physicians for eleven years — and what they found...
cleanse
Detox Supplements
No randomized trial has ever tested a commercial detox supplement — but the ingredients that fill those bottles, green tea extract and...
athletes
Supplements for Joint Health
Most joint supplements are tested on people with arthritis, not athletes with working joints. Only a handful of trials have asked the...
hair skin nails
Hair Skin Nails Vitamins
Nearly every hair, skin and nails formula is built on one ingredient at an enormous dose — and the definitive review of...
mens
Men's Skincare Routine Over 40
Four steps, not ten — and the one with a randomized controlled trial behind it is the one most men skip. Here's...
daily wellness
Probiotics vs Prebiotics
Probiotics are live bacteria you swallow. Prebiotics are food for the ones already in you. There's a published dose for one of...
daily wellness
Red Superfood Powder
Beetroot is the one red ingredient with real performance data behind it — and when researchers tested fifty beet supplements, the powders...