PPARA and early-onset autosomal dominant Alzheimer disease: The main PPAR-α endogenous agonist, N-palmitoylethanolamine (PEA) is an anti-inflammatory, analgesic, and anti-allergic compound clinically tested for its neuroprotective effects in multiple sclerosis (MS), Alzheimer’s disease (AD), and Parkinson’s disease (PD) [90,91].