The present invention discloses pharmaceutical/nutritional compositions for alleviating symptoms associated with premenstrual syndrome (PMS) and methods of treatment for PMS using such pharmaceutical/nutritional composition including: at least 2% (w/w) phosphatidyl-L-serine, or salts thereof, out of a total composition, as an effective ingredient, wherein: the phosphatidyl-L-serine has a structural fatty-acid chain derived from at least one raw material lecithin. Preferably, the phosphatidyl-L-serine is produced by enzymatic reaction of at least one raw material lecithin with phospholipase-D； at least one raw material lecithin is selected from the group consisting of: a vegetal lecithin and a non-vegetal lecithin； and the phospholipase-D is selected from the group consisting of: vegetal phospholipase-D, bacterial-originated enzyme phospholipase-D, and a combination of vegetal phospholipase-D and bacterial-originated enzyme phospholipase-D. Preferably, the structural fatty-acid chain is a saturated, hydrogenated fatty-acid chain. Preferably, the phosphatidyl-L-serine is derived from a dairy lecithin.
