Immunological and haematinic consequences of feeding a standardised Echinacea (Echinacea angustifolia) extract to healthy horses.
Authors: O'Neill W, McKee S, Clarke A F
Journal: Equine veterinary journal
Summary
# Editorial Summary: Echinacea Extract and Equine Immune Function O'Neill, McKee and Clarke (2002) addressed a significant gap in the evidence base by conducting the first controlled laboratory investigation into Echinacea angustifolia's effects on horses, a supplement already gaining traction in practice despite minimal rigorous safety or efficacy data. Over a 42-day double-blind, placebo-controlled cross-over trial involving eight horses, the researchers measured immunological markers and haematological parameters in response to standardised Echinacea extract versus placebo. Supplemented animals demonstrated measurable improvements in immune competence, including enhanced neutrophil phagocytic capacity, elevated peripheral lymphocyte counts, and apparent stimulation of neutrophil tissue migration, alongside secondary haematological benefits: increased red blood cell size and concentration, elevated haemoglobin levels, and improved packed cell volume. Beyond immunostimulation, the extract exhibited haematinic properties—effectively functioning as a blood-quality enhancer with theoretical implications for oxygen transport capacity and exercise physiology. For practitioners considering Echinacea supplementation, this early evidence supports biological plausibility for immune support and potential performance benefits, though the small sample size warrants replication in larger populations and longer-term studies examining clinical outcomes rather than laboratory markers alone.
Read the full abstract on PubMed
Practical Takeaways
- •Echinacea extract appears to enhance immune function in healthy horses, potentially supporting disease resistance during stress periods or competition seasons
- •The haematinic properties (improved red blood cell parameters) suggest possible benefits for exercise performance and oxygen transport, though field performance data are needed to confirm practical utility
- •Standardised extract dosing and 42-day supplementation periods appear feasible for practice use, but long-term safety and cost-effectiveness relative to other immune support strategies remain unclear
Key Findings
- •Echinacea supplementation increased phagocytic ability of isolated neutrophils in horses over 42 days
- •Treatment boosted peripheral lymphocyte counts and stimulated neutrophil migration from circulation into tissues
- •Echinacea increased red blood cell size and concentration, haemoglobin concentration, and packed cell volume