It's a medical fact that some genetic disorders are specific to particular groups of people. For example, Thalassemia is a blood disorder that particularly affects people in the Mediterranean region and in some parts of Asia and Africa. However, in otherwise healthy people, the general rule is that diseases are not specific to one particular group of people whether by geography or race. All humans are sufficiently alike in their basic biology that what affects one will potentially affect all unless some degree of immunity has arisen through previous exposure to the pathogen. In the case of Androgentic Alopecia, men have an equal chance of losing their hair no matter what their racial heritage. Once the hair follicle begins to shrink, hair thins and, if not stopped through the use of Propecia, baldness is an inevitable outcome.
Fortunately, the clinical trials which convinced the FDA of the drug's effectiveness and safety profile also confirmed that the active chemicals are equally effective across all racial groups. There was no statistically significant difference in the reaction of African American, Asian or other racial groupings. This has not prevented an explosion in the number of products being advertised to the different communities, each one promising a "cure" that will particularly help the community targeted. You should remember that Propecia is the only drug approved by the FDA. No other natural or manufactured product can legally claim effectiveness. This does not, of course, prevent the fly-by-night operators from making their promises of miraculous results, taking the money and disappearing. So the first and most important piece of advice here is not to be deceived by these adverts. None of the products will stop hair loss.
If you feel you want a second line of defense, the only options are minoxidil and a good antiseptic shampoo. So, when you are taking the drug, you could consider minoxidil which is available over-the-counter. You can buy it as a standalone product in a cream or foam which you rub on to your scalp. Some shampoos contain it.