<s>[INST] I am 55 years old and a having some issues with urinating etc.  My doctor suggested I try Saw Palmetto in an effort to reduce the size of my prostate.  Since then, I have noticed that my semen is not thick and yellow / green in color.  Can this be a side effect from the Saw Palmetto?  Should I get a semen analysis? [/INST] Hello,Usually the herb may not cause thinning of semen but it may alter the hormonal status and alter the metabolism of few drugs. Don't worry but it may possible with coloring agents in food or carrot or beetroot consumption or second infection. Withdrawal the drug and see weather it is improving or not. If no improvement please consult your physician he will examine and treat you accordingly.Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Penchila Prasad Kandikattu, Internal Medicine Specialist </s>