It really shouldn't. At the end of the day, the main chemical ingredient and what you ordered, is finasteride. I've read people claiming certain manufacturers have inferior products but in the very same thread I'd see people counter those posters with positive results. I've personally been through several finasteride manufacturers over the years and have never noticed a difference between them. That being said, without being a hypochondriac about it, monitor your health and hair loss when starting this new pill for anything adverse. I would not expect to see anything though.