Can you tell me whether you believe that homeopathy has an effect on the recipient's health ?

Absolutely: If you're working with a well-trained, professional homeopath, and that homeopath takes your case at depth and prescribes from there, then YES homeopathy can have a positive effect on your health. If you're buying remedies yourself without training, and do not understand how each acts -- then it can have either no effect or possibly even worsen your condition. I am careful with my prescribing.