Dosages

Phenylalanine

U.S. RDA:
Not Available

Dr. Atkins:
Lethargy: 250 - 1,000mg before mealtime.
Depression: 250 - 1,000mg before mealtime.
Fatigue: 250 - 1,000mg before mealtime.
Pain: 250 - 1,000mg before mealtime.

Dr. Balch:
Autism: 500mg, on an empty stomach with L-glutamine, L-tyrosine and taurine.
Drug addiction: 1,500mg daily, taken upon arising.
Frigidity: 500mg daily, on an empty stomach with L-tyrosine.
Memory problems: follow label directions. Take with L-glutamine and L-aspartic acid.
Obesity: follow label directions, take on an empty stomach.

Dr. Barney:
Not Available

Drs. Zand, Spreen, & LaVille:
Depression: 500 - 1,000mg of DL-phenylalanine twice daily, between meals for up to three weeks.

Integrative Medicine Communications:
The following are the recommended dietary allowances for phenylalanine plus tyrosine, according to the National Research Council.

Birth to 4 months: 125 mg/kg/day
5 months to 2 years: 69 mg/kg/day
3 to 12 years: 22 mg/kg/day
Adults and teenagers: 14 mg/kg/day

Based on obligatory amino acid losses (including data from amino acid tracer studies), it has been suggested that adults need 39mg/kg/day.

Nutritional doses are 0.75 to 2 g per day; therapeutic doses are 2 to 3 g per day; experimental doses are 4 to 5 g per day.