One way to shrink an enlarged prostate is through medication, but if you are not ready to take prescription medication, there are some more natural approaches that you can explore, like changes to your diet and exercise routine.
A 2013 review showed that many males with BPH also had vitamin D deficiency. The review also discusses additional studies that focused on increasing vitamin D intake which showed promising results in reducing BPH. Either through supplements or vitamin D-rich foods, increasing vitamin D in your diet may cause a reduction in BPH symptoms.
Obesity may also play a role in the severity of BPH symptoms. Positive changes to your diet may also help with BPH, particularly with the inclusion of more fruits and vegetables like tomatoes — that can also lower the risk of developing prostate cancer — and bell peppers that are rich in vitamin C.