New Pure Encapsulations L Tyrosine 90 pcs L-Tyrosine Capsules The amino acid tyrosine is important for the formation of messenger substances (catecholamines). Application: Do not use if you have an overactive thyroid gland or are taking MAO inhibitors. 1 capsule per day between meals. The American Low Value Shipment Regulatory Modernization Act is active since March 2016 and increases the duty and tax free value of goods American citiziens could import from other countries by mail from $200 to $800 as well as no formal customs procedures are required. The American Low Value Shipment Regulatory Modernization Act is active since March 2016 and increases the duty and tax free value of goods American citiziens could import from other countries by mail from $200 to $800 as well as no formal customs procedures are required