Efficacy, the efficacy of herbal medicines

Contemporary phenomenon appears in many communities are re-taking the drug - natural medicines / herbs are derived from plants, because the drugs - drugs shown to cause adverse chemical / negatives that are harmful to human body.
Four months ago I was a cold and sore throat, despite drug treatment - chemical medicines in pharmacies and even high doses of antibiotic drugs, but still relapse, continuous flow of fluid from the nose, so it is only a temporary recovery. Possible virus / bacteria have developed resistance to antibiotics ......
After a long time suffered from colds and sore throats are very disruptive in the association, accidentally end up a doctor friend of mine offered a capsule-shaped medications made ​​from plants like black cumin black cumin seed, Seed or Habbat's name.
Beginning I was unsure of his usefulness, but after trying for 2 weeks of starting to feel the results, runny nose and sore throat gradually recovered and the body feel fresh again, so finally I believe in herbal medicines than chemical drugs.
Apparently Black Seed is one of the main natural medicine / herbal plants derived from Black Cumin seed (nigella sativa), and has long been used for treatment since the time of the Prophet Muhammad, according to excerpts from the book of al-shahihain: from Abu Hurairah ra The Messenger of Allah, said: "Use the Black Seed because in it there is a drug of all diseases except As-Sam (death)" (translation of bukhari hadith shahihain history, Muslim).