Blog
Ferritin and aging: how to read iron stores without overreacting
Ferritin reflects iron stores and inflammation. Learn practical risk zones, why ferritin needs TSAT and CRP context, and how to discuss high or low values.
Glucose and aging: blood sugar, longevity, and biological age
Fasting glucose is a key metabolic aging signal. Learn optimal ranges, centenarian patterns, post-meal spikes, and practical ways to improve it.
HbA1c: Why glycated hemoglobin is the movie of your metabolic aging
Glycated hemoglobin (HbA1c) reveals 90 days of metabolic history in a single number. Discover optimal values for longevity, what centenarians teach us, and 7 strategies to lower it.
Homocysteine: The hidden biomarker of aging (and the centenarian paradox)
Homocysteine is a key amino acid for DNA methylation and biological aging. Discover optimal values for longevity, the centenarian paradox, and how to lower it naturally with B vitamins and lifestyle changes.
Lymphocyte %: Your immune system's thermometer (and why it predicts how fast you're aging)
Lymphocyte % is one of the 9 PhenoAge biomarkers for calculating biological age. Discover optimal values, what high and low lymphocytes mean, and how to optimize your immune system for longevity.
Triglycerides/HDL ratio: The hidden biomarker that predicts how fast you're aging
The triglycerides/HDL ratio is one of the best predictors of insulin resistance, cardiovascular risk, and biological aging. Discover optimal values, what science says, and how to improve it.
White blood cells (WBC): Less is more? What science says about aging and longevity
White blood cell count is one of 9 PhenoAge biomarkers for calculating biological age. Discover why lower values (within normal range) predict longer life, and how to optimize WBC.
Albumin: The centenarian biomarker (what low levels can tell you)
Albumin is a useful aging and longevity biomarker, but low values need context. Learn ranges, centenarian data, PhenoAge links, and when to retest.
MCV: When red blood cells are too large (and what it has to do with longevity)
MCV measures the size of your red blood cells and is one of the 9 biomarkers in PhenoAge. Discover normal values, causes of high and low MCV, and why this parameter predicts mortality and cognitive decline.