I am 58 years old  and  have  sex  about twice a week with my wife of many years. I find of late that my erection is not as stiff as it used to be. I have tried Maximor but it gives me a terrible headache. Is there any other natural product that you would recommend.

I would not recommend any natural products at all- not one. Natural product, for me , means they fall into the  " cheap and nasty" category. Reason for this is simple: there are no clinical tests done on these products. Thus there is no evidence based literature on these products. This means that one has no idea what the side effects of these products are nor does one know the safety and efficacy of them. For a drug to be accepted as safe and effective it goes through many years of clinical trials. So if you have a problem/side effects there is recourse for you to go back to the manufaturer and ,as has happened often times, enough problems for enougb people, gets the drug removed from the shelves. Not so with natural products. I urge you to avoid them even though they are cheaper - they may even work but they mask symptoms , such as cardio vascular problem , and my be the death of you- literally.