The online modafinil and smart drug industry is a bit of a Wild West due to government regulations and legal loopholes. This type of market makes it easy for unethical companies to dupe customers into buying their products.
Become an educated consumer and look into your source of modafinil before purchasing.
Review sites like modafinil.org vetts key industry players in the space for product quality and customer service. They also give you expert insight to use modafinil safely and effectively.