
Why your pores look bigger after you cleanse
TL;DR: Pore size is mostly genetic. Pore visibility is not. After a stripping cleanser, pores look bigger because the surrounding skin has…
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TL;DR: Pore size is mostly genetic. Pore visibility is not. After a stripping cleanser, pores look bigger because the surrounding skin has…

TL;DR: The original niacinamide research used 2 to 5 percent, not 10 percent. The 10 percent serums sold today are extrapolations, not…

TL;DR: An open bottle of 15% L-ascorbic acid serum loses a meaningful percentage of its active dose within weeks, not months. The…

TL;DR: Three of the most common reasons a dark patch won’t fade are post-inflammatory hyperpigmentation, melasma, and Hori’s nevus. They look similar…

TL;DR: Ceramide moisturizers work brilliantly for the first month, then most people notice diminishing returns. The reason is usually not the ceramide…

TL;DR: The “14-day skin reset” you keep seeing on social media is a marketing timeline, not a biological one. Mild barrier damage…

Welltory measures HRV through your phone camera and turns it into a daily stress and energy score. The HRV-stress-cortisol-skin chain is real…

SunSafe promises a 10-day UV forecast, skin-type-aware burn-risk scoring, and a safe-tanning module that estimates an even-tan progress curve. In 2026, with…

UVLens markets itself as a personalized hourly UV forecaster with a Fitzpatrick-tuned avatar. The data is competent. The reminders are the actual…

Sun Day is Jack Dorsey's open-source UV and vitamin D tracker, launched on TestFlight in July 2025. Single screen, auditable code, and…