I was at a Kowloon Mannings store to get some minoxidil. It looks like they don't sell it. However, there are many hair loss products available in the store, just none that I am familiar with.
None of these products are FDA approved for hair loss. Three possibilities: the U.S. medical-industrial-complex doesn't want you to know about these (possibly Chinese) alternatives because of their low profit potential, or these are just scam products that the Hong Kong government doesn't feel moved to do anything about, or that they actually work.
It looks like the first and third possibilities may overlap, so the 4th possibility: there's not much business potential in making the product and it also works.