S.H.
I would see your OB/GYN.
My Doctor told me, that if after 6 months of not conceiving, then to consult him. When I got pregnant the first & second times (naturally), I was over 35 years old. So age is or is not a factor. And, my OB/GYN always tells his patients to continue taking pre-natal vitamins prior to wanting to conceive.
It could be anything. The "problem" could even be with your Husband. It is not always the wife.
Even just "stress" alone, can prevent a woman from getting pregnant.
The thing is, just taking herbals or whatever is rumored to help... can also "not" help. And what is good for one person, may not be for the other. So, it's just not GUARANTEED.
You also want to be sure that your periods are regular, and your ovulation symptoms. You can also track your Basal body temperature every morning, and keep track of periods and ovulation symptoms.
The best thing, is to consult your Doctor. Get an exam, make sure there are no other problems. You have waited 5 years already, with no results... so I would now check with Doctor.
All the best,
Susan