ScienceInsights

Some vitamins and supplements may help with erectile dysfunction, but the best choice depends on your underlying cause. Here's what the research shows.

Retinaldehyde, retinol, HPR, bakuchiol—each works differently on skin. Here's how to pick the right one for your goals and sensitivity level.

CBT-I, light exposure, and a few behavioral tweaks can fix insomnia more effectively than pills — here's what the evidence shows.

Gastric bypass costs $20,000–$35,000 in the US. Learn where to find qualified surgeons, who's eligible, and what ongoing follow-up care looks like.

Tommy John surgery repairs a torn UCL in the elbow, letting most pitchers return to play after about a year of recovery.

Chronic stress can contribute to anxiety, depression, PTSD, and more. Learn which psychological conditions are linked to stress and why some people are more at risk.

Some testosterone supplements have real science behind them, while others don't. Here's what the evidence actually says about common ingredients and safety.

The distal convoluted tubule fine-tunes salt, calcium, and magnesium balance in your kidneys — and plays a key role in blood pressure and common diuretic medications.

Ran out of diapers? Here's how to make a temporary one, boost absorbency, and find free or fast replacements nearby.