Home remedies are in common use for essentially all treatments and so it has been for all of mankind's history. The ancient Asians, for example, drank urine from their mares to help them urinate better. This particular approach actually has scientific merit, in that mare urine is relatively rich in estrogenic hormones, which can indirectly reduce the size of the prostate and open the urinary channel.
Among the home remedies most commonly in use for prostate diseases is the ingestion of powdered extract of Saw Palmetto, known in Latin as serenoa repens. The saw palmetto, a short palm tree, is indigenous to the southeastern United States and its medicinal properties have been not only commercially promoted but also heavily studied.
In regards to prostate diseases alone there are dozens of scientific articles, most commonly as this related to benign prostate enlargement. The data in regards to its clinical effects are at best contradictory.
One of the better studies on the effect of Saw Palmetto in prostatitis is a 2004 publication comparing it to finasteride (Proscar), a medication that can partly reduce urinary obstruction and the long-term risk of prostate cancer. The study involved patients with type III Chronic Prostatitis/Chronic Pelvic Pain Syndrome who had an average age of 43 years. All had received antibiotics; a solid majority had also received alpha-blockers.
At a followup of 12 months, these patients had seen a change in their baseline scores on the NIH-Chronic Prostatitis Symptom Index (CPSI) from 24.7 to 24.6. In other words, Saw Palmetto had no effect. There appears to be no reason to consider Saw Palmetto in the treatment of prostatitis.