DOI: 10.1055/s-00000058

Planta Medica

References

Woelkart K, Marth E, Raggam R, Suter A, Schoop R, Koidl C. et al.
Bioavailability and pharmacokinetic studies on Echinacea purpurea preparations and their interaction with the immune system 
Int J Clin Pharm Ther 2006; 44: 401-8.   

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