General Advice

Retinol is one of the most studied actives in skincare - but what does it actually do overnight? Here are five real, source-backed benefits, plus the basics on starting it safely without irritation or sun damage.

Salicylic acid is one of the most studied actives for oily, acne-prone skin. Here's what the research actually shows about how this BHA clears pores, calms breakouts, and refines texture.

Oily forehead and nose, dry or flaky cheeks, the same product rarely works on both. Here's how a dermatologist-informed combination skin routine treats each zone differently, with the specific actives that belong on oily areas versus drier ones, and why one moisturizer alone rarely covers a whole face.

Tight, flaky skin isn't always "dry" skin. Learn the real difference between dehydrated skin vs dry skin, why hyaluronic acid alone can fall short, and where ceramides fit into the routine.

Skipping moisturiser for oily skin makes the problem worse over time. Here is the physiology behind it and how /PHD/'s 3% Niacinamide Oil-Free Moisturizer balances oil control with barrier support.

Stinging serums, dull skin despite a full routine, and products that stop working are all signs of a damaged barrier. Here is how to identify it and repair it with /PHD/'s 1% Ceramides Barrier Repair Cream.

Alpha arbutin is frequently compared to hydroquinone, but the evidence and safety profile are meaningfully different. Here is what the clinical research shows for /PHD/ 2% Alpha Arbutin Serum and Indian skin.

Niacinamide is one of the most versatile actives in skincare, but most people only scratch the surface of what it can do. Here is the evidence-backed guide for why 10% niacinamide suits Indian skin concerns.

Retinol has the strongest clinical evidence of any cosmetic active, but starting it wrong causes PIH and irritation. Here is the slow-start protocol for /PHD/'s 0.3% Retinol Serum that dermatologists recommend for Indian skin.