5 Biomarkers Everyone Should Track for Longevity

Longevity science has moved far beyond counting birthdays. Today, researchers and functional medicine practitioners can measure biological age through specific blood markers that reveal how quickly or slowly your body is aging at the cellular level. The gap between your chronological age and your biological age is where the real story lives.

1. High-Sensitivity C-Reactive Protein (hs-CRP)

Chronic low-grade inflammation is considered the single biggest driver of age-related disease, from heart disease and diabetes to neurodegeneration and cancer. Standard CRP tests only flag acute inflammation like infections. High-sensitivity CRP detects the subtle, smoldering inflammation that accumulates over years.

Optimal levels are below 1.0 mg/L. Anything above 3.0 is a red flag. Many functional medicine practitioners consider levels between 1.0 and 3.0 worth investigating, especially when combined with other markers.

2. Hemoglobin A1c (HbA1c)

HbA1c measures your average blood sugar over the past two to three months. While conventional medicine uses it primarily to diagnose diabetes, functional medicine views it as an early warning system for metabolic dysfunction. Even "pre-diabetic" levels (5.7 to 6.4 percent) indicate that insulin resistance is already underway.

For longevity, you want your HbA1c below 5.4 percent. This level correlates with lower risk of cardiovascular disease, cognitive decline, and all-cause mortality.

3. Vitamin D (25-OH)

Vitamin D is not just about bone health. It functions as a hormone that influences over 200 genes involved in immune function, mood regulation, cancer prevention, and cardiovascular health. Despite living in the information age, Vitamin D deficiency affects an estimated 42 percent of American adults.

Standard labs often mark anything above 30 ng/mL as sufficient. Functional medicine practitioners typically aim for 50 to 80 ng/mL for optimal health and longevity.

4. Fasting Insulin

Here is something most people do not realize: you can have perfectly normal blood sugar and still have dangerously elevated insulin. Fasting insulin is one of the earliest markers of metabolic dysfunction, often rising years before blood sugar does. High fasting insulin drives fat storage, increases inflammation, and accelerates aging at the cellular level.

Optimal fasting insulin is between 3 and 8 uIU/mL. Many people with "normal" blood sugar have fasting insulin above 12, indicating their pancreas is working overtime to maintain that blood sugar level.

5. Homocysteine

Homocysteine is an amino acid that, when elevated, damages blood vessel walls and increases risk of cardiovascular disease, stroke, and cognitive decline. It also serves as a marker for B-vitamin status, particularly B12, B6, and folate. Elevated homocysteine is remarkably common and remarkably easy to address with targeted supplementation.

Optimal levels are below 8 umol/L. Standard lab ranges allow up to 15, but research consistently shows increased risk above 10.

Why Standard Labs Miss the Story

If you have ever had a standard annual physical, you probably had a basic metabolic panel and lipid panel. These tests check a handful of markers and use wide reference ranges designed to catch disease, not optimize health. Most of the biomarkers above are either not included or interpreted with ranges too broad to be useful.

All five of these biomarkers are included in our Ignite panel, along with dozens of additional markers. Because understanding where you stand today is the first step toward aging better tomorrow.