It is cheapest. If you going to make something that doesn't work, it naturally follows that you use the cheapest ingredients, hence the most profit, and why it was made to begin with.
There's a few other drugs (fully synthetic and usually not approved in topical preparations, let alone cosmetics) which promote hair growth... but that's just as a side note.
markfuller@microformulation.com Microformulation.com Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.
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Only thing proven to grow hair: Minoxidil
Follow the $$$