ashwagandha
Ashwagandha Side Effects
The common ashwagandha side effects, the rare liver and thyroid risks, and who should skip the herb or talk to a doctor...
caffeine
Creatine and Coffee
Can you mix creatine and coffee? One small 1996 study said caffeine cancels creatine, later trials mostly didn't. What the research shows,...
daily wellness
Immune System Support Supplements
Across more than 10,000 people, daily vitamin C didn't prevent colds. In marathon runners, skiers and soldiers, it cut the risk roughly...
protein
Whey Protein Isolate
Whey protein isolate costs more, and the label says more filtering means more muscle. The meta-analysis that compared isolate and concentrate in...
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...