Cold Treatment – Research & Answers

Cold TreatmentApr 30, 2026

Most People Take Too Little Lysine for Cold Sores to Make Any Difference

Lysine is one of the most popular natural remedies for cold sores, but the dose most people take probably isn't doing much. Controlled trials consistently show that doses under 1 gram per day are ineffective for preventing outbreaks. The studies that did find benefits used 1 to 3 grams daily, and even then, results were inconsistent. Lysine isn't useless, but it's far less reliable than standard antiviral medications, and the gap between what works in a lab and what works in your body is wider than supplement labels suggest. The core idea is biologically sound. The herpes simplex virus (HSV-1) that causes cold sores depends on the amino acid arginine to replicate. Lysine competes with arginine, and in laboratory settings, high-lysine, low-arginine environments do inhibit the virus. The problem is translating that clean laboratory result into messy real-world prevention.

Immune SystemApr 30, 2026

Most Zinc Lozenges Don't Work, But the Right Ones Can Cut Your Cold by 3 Days

The best zinc lozenge trials show something genuinely impressive: colds shortened by roughly 40%, with triple the chance of being recovered by day five. That translates to about three fewer days of misery from a typical week-long cold. But here's the catch. Many of the zinc lozenges you'll find at the pharmacy are either under-dosed, formulated with ingredients that neutralize the zinc, or both. The difference between a lozenge that works and one that's dead on arrival comes down to details most people never check. A 2024 Cochrane review of 19 treatment trials found zinc may shorten colds by about 2.4 days on average, though the evidence was graded low-certainty with high variability between studies. That variability isn't random. It maps closely onto differences in dose, formulation, and how the lozenges were used.