Free Tools

Free, interactive tools grounded in peer-reviewed clinical research. Trial results cite their primary sources, and anything estimated — like a projection curve — is clearly labeled as an estimate.

These tools are for education. They show what studies found in groups of people, not what's true for you. They don't diagnose, aren't medical advice, and don't decide whether any treatment is right for you. For decisions about your health, talk to a clinician.

• Tirzepatide vs Semaglutide Weight Loss Simulator

  See how much weight people lost in the only head-to-head randomized trial of the two leading medications — applied to your starting weight.

• The NAD+ Clock

  Is your cellular battery running low? See an estimate of how NAD+ changes with age, based on published research.