There are various factors affecting menstrual cycle.

Best is of course visit a gynae. Clinic won't be able to help much. If you have a history of irregular menstrual cycle, you may need to take hormone pills to regulate your cycle.

If you don't wish to see a gynae yet, then try stress relieve methods. Stress can affect menstrual cycle tremendously in some women. Other than stress, there's also sickness, food consumed, lifestyle changes, etc. that can affect menstrual cycle and our hormones. Some people are more easily affected than others, everyone is different.

For some, EPO may work but for a more effective method, it's best to go with hormone pills.

As far as I know, EPO is a supplement and won't help much in hormonal imbalance. If you say to reduce PMS and menopause symptoms then yes, it's quite well known for that, but not in regulating menstrual cycles. For benefits on EPO, you can easily google it.

If your friends swears by it, then you can always try EPO first. If it doesn't work only try other methods.

If you are facing stress, then it's very common for your menstrual cycle and hormones to go haywire. Some people are very easily affected by stress. Some of us also don't know that we are under stress.

I have a friend who did not have period for 3 months because she was under stress for an important exam. Once the exam was over, her menstruation started like usual.

Then again, there are also many of us who naturally have irregular menstrual cycles. So the best way is always to go see a gynae and see if she can determine what is the best way to help you.