The best websites will require a valid prescription from a licensed healthcare provider, as Adderall is a prescription medication used to treat ADHD and narcolepsy. Reputable online pharmacies are typically verified by the National Association of Boards of Pharmacy (NABP) or carry the VIPPS (Verified Internet Pharmacy Practice Sites) accreditation. Always be cautious of websites that offer Adderall without a prescription, as this could indicate illegal or unsafe practices.