A two‑month aromatherapy regimen nightly lemon–rosemary and daytime lavender–orange improved cognition in dementia‑prone SAMP8 mice (Y‑maze). Treated mice showed markedly lower brain amyloid‑β and hyperphosphorylated tau, with a small rise in BDNF. Findings suggest timed essential‑oil blends may reduce core Alzheimer’s pathology and boost memory in this model; human studies are needed.