Blog
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.
Vitamin B12 and aging: The hidden biomarker that predicts longevity
Vitamin B12 is a key aging biomarker. Discover optimal values for longevity, why it drops after 50, the U-shaped mortality curve, and how to optimize it through diet and supplementation.
Vitamin D and longevity: what the 2026 evidence really supports
Harvard's 2025 VITAL Telomere trial found that vitamin D3 supplementation reduced telomere shortening, a cellular aging marker. Learn what the evidence really supports, safe target ranges, and 7 strategies to optimize low vitamin D without megadosing.
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.