Lack of focus and concentration – ZeinPharma® L-Phenylalanine 500 mg,
Low neurotransmitter levels – ZeinPharma® L-Phenylalanine 500 mg,
Deficiency in essential amino acids – ZeinPharma® L-Phenylalanine 500 mg,
Mood imbalance and mental fatigue – ZeinPharma® L-Phenylalanine 500 mg