How can I add caffiene to my shampoo?

Ubermonkey99

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I wish to add caffeine to my current shampoo. I don't want to buy Alpecin etc.
Tutorials online all use coffee, is there a better, more direct way? How do the big brands add it?
 

ihatemylife223

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maybe just crush up caffeine pills and throw them in there? they're pretty cheap

maybe find a caffeine extract or something idk
 
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