If it actually regrows a lot of hair that might be the last thing they do. As it stands now, the science of the lotion purports to modify physiological and metabolic functions in the body. It would most definitely be considered a borderline product in the eyes of the European Cosmetic Commission.
If it doesn't regrow hair, then it will be ignored by regulation committees like all the other scam cosmetics that don't affect your hair like they claim.
But if it substantially regrows hair, then it proves that it is significantly modifying physiological and metabolic functions in the body, which would gain more attention from regulatory committees and perhaps render it a medicinal product, which means it would leave the market because it did not go through the proper channels to become a drug.
That's one of the main reasons why I think it won't regrow hair and at best be maintenance and if we're very lucky cause micrometers of thickening of still terminal hairs.