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Insulin (fasting)

Metabolic Unit: μIU/mL

Marker of insulin resistance when elevated

Also known as: Fasting Insulin

Reference Ranges

Clinical Reference 2.0 – 25.0 μIU/mL

Optimal Range 2.0 – 8.0 μIU/mL

Fasting 8-12h

Related Conditions

Diabetes High

Metabolic Syndrome High

Food & Lifestyle Recommendations

🍎 Food Increase fiber intake (25-35g/day) and reduce processed foods and sugary drinks High-fiber diets improve insulin sensitivity in RCTs

🏃 Exercise Resistance training 2-3x/week improves insulin sensitivity more than aerobic alone Muscle is the primary site of insulin-mediated glucose disposal

Evidence-Backed Supplements

When High

Berberine Tier A May Decrease WESTERN

Improves insulin sensitivity in RCTs

Berberine HCl 500 mg 2–3x/day With meals

PMID 30466986 PMID 35623810 PMID 36805484
Magnesium Tier A May Decrease

Meta-analyses show improved insulin sensitivity

Magnesium glycinate 200–300 mg elemental Mg/day Evening

PMID 33419615 PMID 23440790 PMID 32956536

Questions to Ask Your Doctor

Does my elevated fasting insulin suggest insulin resistance even though my glucose is normal? High insulin with normal glucose = early insulin resistance

Upload your blood test to see how your Insulin (fasting) compares to reference and optimal ranges.

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