ScienceInsights

Valacyclovir can treat cold sores in just one day. Here's how the regimen works, how much it helps, and when to take it for best results.

From creams to laser therapy, here's what the evidence says about fading thigh stretch marks and what results you can realistically expect.

Your body can survive weeks without food, but the timeline varies by fat stores, sex, and health. Here's when fasting starts to become medically risky.

The prostate does more than most men realize. Learn how it nourishes sperm, controls ejaculation, and changes as you age.

Learn how to estimate your maximum heart rate using common formulas, why they're imperfect, and how to use the number to guide your workouts.

From antifungal pills to home remedies, here's what actually helps clear up a yeast infection fast — and what's worth skipping.

A boiled egg has around 78 calories, mostly from the yolk. Learn what's inside, how it compares to fried eggs, and why eggs are so satisfying.

CBD can stay in your system much longer than you feel its effects. Here's how your body actually processes and clears it.

If Lexapro isn't fully controlling your anxiety, here are the medications and supplements doctors commonly add, plus what to avoid.

Leg cramps are painful but usually manageable. Learn what causes them, how to get relief fast, and practical ways to prevent them from coming back.