Sepideh Cheheltani

A beginner-friendly guide. Last updated May 2026 Walk into any skincare aisle and you'll see acids listed on nearly every bottle. Glycolic acid. Salicylic acid. Hyaluronic acid. But what do they actually do, and should you be worried? Here's everything you need to know, no chemistry degree required. Not all acids are the same The word "acid" sounds harsh, but in skincare it usually refers to gentle chemical compounds that help your skin shed dead cells and stay healthy. There's one important...

What is Presbyopia? Presbyopia, often called “age-related farsightedness”, is a natural part of aging that is caused by the gradual loss of the eye’s ability to focus on near objects, like when reading or looking at a phone. It occurs because the crystalline lens inside the eye becomes stiffer with age, and the surrounding muscles lose some elasticity. This affects nearly everyone over 40, impacting over a billion people worldwide. For decades, the main solutions have been reading glasses,...