What is the optimal range for hs-CRP?

Standard reference range: 3 mg/L (elevated) mg/L. Optimization-focused target: <1.0 mg/L — often <0.5 mg/L in highly optimized individuals mg/L.

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INFLAMMATION BIOMARKER

hs-CRP

Q: What does hs-CRP measure?

High-sensitivity C-reactive protein (hs-CRP) is an acute-phase protein produced by the liver in response to inflammatory cytokines (primarily IL-6). The "high-sensitivity" assay is calibrated to detect the low levels relevant to chronic, smoldering inflammation — distinct from the "regular" CRP assay used to detect acute infection or injury. For chronic-disease risk assessment, always order hs-CRP, not standard CRP.

Q: What affects hs-CRP levels?

hs-CRP is influenced by: adiposity (visceral fat drives chronic inflammation), insulin resistance, poor sleep, alcohol intake, smoking, dental/gum disease, autoimmune activity, recent infection or injury (elevates transiently for 1–3 weeks), intense training (transient elevation up to 48 hours post-session), and pharmacologic agents — statins, SGLT2 inhibitors, GLP-1 agonists, and metformin all typically lower hs-CRP. Omega-3s, dietary fiber, and polyphenols show modest reductions in many people. Recent infection or overtraining can invalidate a single measurement — repeat elevated values before drawing conclusions.

High-Sensitivity C-Reactive Protein

The most commonly used marker of low-grade systemic inflammation and cardiovascular risk.

STANDARD RANGE

<1 mg/L (low risk); 1–3 mg/L (average); >3 mg/L (elevated)

OPTIMAL (OPTIMIZATION)

<1.0 mg/L — often <0.5 mg/L in highly optimized individuals

What hs-CRP Measures

High-sensitivity C-reactive protein (hs-CRP) is an acute-phase protein produced by the liver in response to inflammatory cytokines (primarily IL-6). The "high-sensitivity" assay is calibrated to detect the low levels relevant to chronic, smoldering inflammation — distinct from the "regular" CRP assay used to detect acute infection or injury. For chronic-disease risk assessment, always order hs-CRP, not standard CRP.

Chronic low-grade inflammation is now understood as a shared mechanism linking cardiovascular disease, metabolic disease, and many cancers. hs-CRP is the single most accessible lab marker for that inflammatory state. Unlike more specialized markers (IL-6, TNF-α), it's available at every major lab for ~$10–$30 and reference ranges are well-established.

What Affects This Biomarker

hs-CRP is influenced by: adiposity (visceral fat drives chronic inflammation), insulin resistance, poor sleep, alcohol intake, smoking, dental/gum disease, autoimmune activity, recent infection or injury (elevates transiently for 1–3 weeks), intense training (transient elevation up to 48 hours post-session), and pharmacologic agents — statins, SGLT2 inhibitors, GLP-1 agonists, and metformin all typically lower hs-CRP. Omega-3s, dietary fiber, and polyphenols show modest reductions in many people. Recent infection or overtraining can invalidate a single measurement — repeat elevated values before drawing conclusions.

In the Context of Peptide Protocols

For peptide users, hs-CRP is particularly relevant in healing-stack protocols (BPC-157, TB-500, GHK-Cu) — a meaningful reduction in hs-CRP over the course of a cycle is consistent with the expected anti-inflammatory effects of these compounds. GLP-1 users typically see hs-CRP drop alongside weight and metabolic improvements. Baseline + 12-week follow-up is a reasonable cadence for most protocols; acute illness within 2 weeks of draw invalidates the result.

Peptides That Commonly Move hs-CRP