Tatsiana Yashyna
Deputy COO at Welltory
Deputy COO at Welltory. With a background in medicine and years of working with health data, she translates research and real physiological signals — sleep, stress, heart rate, and hormones — into clear, evidence-based explanations that help people understand what their bodies are telling them.
Latest articles
Black Friday for stress and sleep: apps vs gadgets vs supplements — what gives you the most per dollar
Meditation apps, sleep gadgets, supplements and measurement compared as categories: what each costs per year, what the evidence says, and which ones can tell you whether they are working for you — with a sensible order for a limited budget.
The best health investments under $100 this Black Friday
Seven health and wellness buys under $100 — six product categories and one app, Welltory, which publishes this guide — with today's US price ranges, what each gives per dollar, the evidence behind it, what to skip on Black Friday, and how to choose if your energy is limited.
Bought a wellness gadget on Black Friday? How to tell if it's actually working for your body
The study on the box describes an average. A simple before/after experiment — baseline week, one change, weekly comparison — shows whether a gadget, supplement or membership works for you, with an honest look at placebo, noise and regression to the mean.