Blog
UV damage and photoaging: What the sun does to your biology beyond your skin
UV radiation causes far more than cosmetic aging. UVA degrades collagen via MMPs, UVB creates DNA mutations, and systemic inflammation follows. Here is the full science — and how to protect yourself.
Respiratory rate by age: What's normal and when to worry
Learn what a healthy respiratory rate looks like for every age, what causes it to change, and how to track it. Includes normal range chart and sleep data.
AST/ALT ratio (De Ritis): What it reveals about your liver and longevity
Learn what the AST/ALT ratio can and cannot reveal about liver health, metabolic risk, alcohol patterns, exercise effects, and longevity research.
Urea and BUN: Your kidneys as a mirror of health (and longevity)
Blood Urea Nitrogen (BUN) is an often-overlooked kidney biomarker. Discover why blood urea predicts aging, what the optimal values are, and 6 strategies to protect yourself.
Alkaline phosphatase (ALP): Liver, bones, and the hidden link to longevity
Alkaline phosphatase (ALP) links liver, bone, inflammation, and biological aging. Learn high vs low patterns, practical tracking zones, and when to follow up.
Creatinine: What your kidneys can reveal about longevity
Creatinine links kidney filtration, muscle mass, and biological age. Learn how to read eGFR, cystatin C, UACR, trends, and longevity context.