Kits for the treatment or prophylaxis of depressed mood are described, for subjects with increased MAO-A levels, excessive crying, or subjects within or beyond the 5-day postpartum period. The kits are used to implement a method by which the subject is administered an antioxidant source on at least the first day of a 3 to 5 day regime； a tryptophan composition on the evening of the penultimate treatment day, simultaneously or following the antioxidant source； and a tyrosine composition the day after the tryptophan composition, on the final treatment day. The kit comprises an antioxidant source which may comprise or be derived from blueberries. Individuals with depressed mood due to perimenopause, alcohol use disorders or withdrawal, or who are up to or beyond 18-months postpartum, may benefit from the kits. The kits described may reduce the likelihood of advancing from depressed mood to depression.
