Mix Caffeine with Water, Apply to Scalp

I saw a German study done in 2005 that indicated that hair follicles treated with caffeine promoted growth. I saw your blog response saying basically that more time and testing would be needed to determine if caffeine actually worked in promoting hair growth. I just ran across a new article here: https://www.naturalproductsmarketplace.com/hotnews/71h3015525992312.html

Based on this data, does it make sense to mix caffeine into a water solution and apply it to the scalp (possibly sleeping with it in your hair overnight)?

Interesting reading. To see my other post on the subject, see Caffeine Used for Treating Hair Loss? I really have nothing more to add at this point. Thanks for bringing this to my attention though.