u/Famous_Secretary_689

How do exactly do potions work? I thought as long as a magical witch brewed a potion then the potion would work and retain its potency post-brewing. We’ve seen Phoebe carry potions in her purse. Why is it that in A Witch in Time, the potions that they brewed didn’t work on Bacarrá? I understand that that he took away their magic, but the potions were brewed when they were still magical. Are there any examples of mortals successfully using potions given to them by the sisters?