Clinical trials for Alzheimer's drugs, like Eli Lilly's Kisunla and Eisai's Leqembi, often lack diversity, excluding racial minorities, ApoE4 homozygotes, and patients with comorbidities. This underrepresentation hampers the validation of eligibility criteria in diverse populations, necessitating new cutoffs. Challenges include socioeconomic barriers and inadequate outreach, impacting trial enrollment and patient care.