Swanson PremiumnSwanson Saw Palmetto 540 mg 250 CapsnPer GMP guidelines set forth by the FDA, most products are formulated for 24 months from the date of manufacture. Liquids and probiotics are formulated for 12 months.nSwanson Saw Palmetto is a great way for men to support their prostate. This potent herb is a source of fatty acids and sterols designed to promote this important area of men's health.