Hello, please can you advise me, I have been diagnosed with essential thrombocythemia in October 2014, I am 62 now.

I have been taking Hydroxycarbamide as a first line drug and Anagrelide as a secondary along with soluble aspirin. My immune system is low as i am easliy infected with flu symptoms and it take longer to be well. I am still employed and can't afford to be off work. My question is can I take a Herbal supplement to boost my immune system such as Echinacea? which has been recommended to me by my brother.

kind regards

Dewi