Interleukin-10
Also known as: IL-10
What Does Interleukin-10 Measure?
Interleukin-10 (IL-10) is an anti-inflammatory cytokine — a small signaling protein produced primarily by immune cells such as monocytes, macrophages, T cells, and B cells. A blood test measuring IL-10 quantifies the concentration of this protein circulating in the bloodstream, typically expressed in picograms per milliliter (pg/mL). IL-10 acts as a master regulator of immune responses by dampening excessive inflammation, limiting the production of pro-inflammatory cytokines like TNF-alpha, IL-1, and IL-6, and preventing tissue damage from runaway immune activation.
Why Does Interleukin-10 Matter?
IL-10 plays a critical balancing role in immune homeostasis. When functioning properly, it prevents the immune system from over-reacting to infections, injuries, or foreign substances — protecting organs and tissues from collateral inflammatory damage. Elevated IL-10 levels can indicate active infections, sepsis, autoimmune conditions, or certain cancers where the body is either fighting inflammation or where tumors are exploiting IL-10 to suppress anti-cancer immune responses. Conversely, insufficient IL-10 activity is associated with chronic inflammatory diseases such as inflammatory bowel disease, rheumatoid arthritis, and psoriasis. Monitoring IL-10 helps clinicians assess disease severity, guide treatment decisions, and evaluate responses to immunotherapy.
Normal Ranges
Males
< 9.1 pg/mL (most healthy adults; many labs report < 5 pg/mL as typical)
Females
< 9.1 pg/mL (most healthy adults; many labs report < 5 pg/mL as typical)
Children
Varies by age; generally < 5 pg/mL in healthy children; neonates may have slightly higher baseline levels
Causes of High Levels
- Sepsis or severe systemic infections — the body produces large amounts of IL-10 to counteract the cytokine storm
- Autoimmune diseases such as systemic lupus erythematosus (SLE), rheumatoid arthritis, and Sjögren's syndrome
- Certain cancers, particularly lymphomas, colorectal cancer, and melanoma, which can exploit IL-10 to evade immune surveillance
- Chronic viral infections including HIV, hepatitis B, and hepatitis C, where IL-10 suppresses antiviral immune responses
- Inflammatory bowel disease (Crohn's disease, ulcerative colitis) during active flares
- Major trauma, surgery, or burns triggering a systemic inflammatory response
Causes of Low Levels
- Genetic polymorphisms in the IL-10 gene that reduce production capacity, associated with increased susceptibility to inflammatory diseases
- Chronic inflammatory or autoimmune conditions where IL-10 production is overwhelmed or dysregulated
How to Improve Your Interleukin-10
Diet
- Increase omega-3 fatty acid intake (fatty fish like salmon, mackerel, sardines 2-3 times per week) — omega-3s are shown to upregulate IL-10 production
- Consume polyphenol-rich foods such as blueberries, dark chocolate (70%+ cacao), green tea, and extra-virgin olive oil to support anti-inflammatory signaling
- Adopt a Mediterranean-style diet emphasizing vegetables, legumes, whole grains, and healthy fats, which is associated with favorable IL-10 levels
- Include fermented foods (yogurt, kefir, kimchi, sauerkraut) to support gut microbiome diversity, which influences IL-10 regulation
- Reduce ultra-processed foods, refined sugars, and trans fats that promote pro-inflammatory cytokine production and suppress IL-10
Supplements
- Omega-3 fish oil: 2–4 g EPA+DHA per day — well-supported by clinical evidence for boosting IL-10 production
- Vitamin D3: 1,000–4,000 IU per day (based on blood 25-OH vitamin D levels) — vitamin D is a key regulator of IL-10 gene expression
- Curcumin (from turmeric): 500–1,000 mg per day with piperine for absorption — shown to modulate IL-10 and reduce inflammatory cytokines
- Probiotics (Lactobacillus and Bifidobacterium strains): 10–50 billion CFU daily — gut-derived signals are major drivers of IL-10 induction
Related Biomarkers
Frequently Asked Questions
What does a high IL-10 level mean?
An elevated IL-10 level typically signals that your immune system is actively trying to control inflammation. This can occur during or after infections (especially severe ones like sepsis), autoimmune disease flares, or with certain cancers. In some cases — particularly with lymphomas or solid tumors — cancer cells produce IL-10 to hide from the immune system. A high result should always be interpreted by a physician alongside your symptoms, medical history, and other lab tests.
Is IL-10 good or bad for you?
IL-10 is generally beneficial because it prevents the immune system from causing excessive tissue damage during inflammation. However, context matters greatly. In infections and autoimmune diseases, IL-10 is protective. In cancer, however, high IL-10 can be harmful because tumors can exploit it to suppress immune cells that would otherwise attack them. So IL-10 is 'good' in the right amounts and contexts, and potentially 'bad' when persistently elevated due to malignancy.
Can I get an IL-10 test at my regular doctor?
IL-10 testing is not part of standard routine blood panels and is primarily used in research settings, specialist clinics (such as rheumatology or oncology), or during hospital evaluation for sepsis and critical illness. Some functional medicine and advanced diagnostics laboratories offer cytokine panels that include IL-10. If you believe this test is relevant to your health, speak with a specialist who can order it with appropriate clinical context.
How does exercise affect IL-10 levels?
Moderate-intensity exercise is one of the most reliable natural ways to temporarily increase IL-10 levels. During and immediately after exercise, contracting muscles release IL-6, which in turn stimulates IL-10 production. This creates an anti-inflammatory effect that counteracts exercise-induced inflammation. Regular physical activity helps maintain a healthier baseline cytokine balance over time. However, extreme overtraining without adequate recovery can have the opposite effect and promote chronic inflammation.