There are several substances which are taken for the purpose of increasing the blood flow to the penis. Some are the following substances which can affect the quality of erections. Alcohol is one of the major cause factors behind the bad erection. When this is taken it will begin to enhance the telomere length which is the thickness of the human artery with which the blood passes into the penis thus enhancing the erection. Sometimes some medications are used to treat the condition namely Valtrex (an herbal alternative to viagra) which will improve the blood circulation. It is very important to keep the blood vessels healthy otherwise you may not be able to maintain a good erection and many men have reported that certain medications are a problem. The other medicines are some which are believed to be the cheapest and most popular in the market but are not really suitable for the man who does not want to take this medicine. Those tablets or tablets with the active ingredient Yohimbe regularly which are not taken for the same reason as Viagra immense; they tend to be quite high doses in dosage and it is always best to find products that are efficacious for the general use.