Probably be blocked from linking Tl;dr there are loads of Kirkland branded fakes. Only way to really tell is by the barcode which is from 5 years ago. Anyway the difference in price between Kirkland and Regaine is marginal so imo regardless worth paying the extra and buying from a reputable seller like Amazon then eBay unfortunately. Quick google search should turn these up hopefully.
Finasteride is much worse, but Minoxidil is implicated in such problems too. Pointless me linking the info as Mods always remove anything like that I post, but there is an interesting Researchgate reported study out there to read (among other stuff).
Don't trust those, have you seen the post on Reddit?
Research the below the waist side-effects of Minoxidil............. and buy yourself a pair of clippers instead!