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Thorne Research, L-Tyrosine, 90 Veggie Caps

By Thorne Research

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In Stock
  • Product Code: THR-51403
  • UPC Code: 693749514039
  • Package Quantity: 90 Veggie Caps
  • Dimensions: 2.3 x 2.3 x 4.3 in, 0.2 lbs (0.09 kg)
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Product Overview

  • Dietary Supplement
  • Hypo-Allergenic

L-Tyrosine essential for neurotransmitter and thyroid hormone synthesis

  • important nutrient for healthy adrenal function
  • supports the thyroid gland
  • promotes a positive mental state and healthy stress management
  • contains no preservatives, magnesium stearate, or other lubricants and diluents

Tyrosine is an amino acid precursor for synthesis of the neurotransmitters norepinephrine and dopamine. By improving the rate of neurotransmitter synthesis, tyrosine stimulates the central nervous system. It appears to function as an adaptogen by relieving physical symptoms of stress, such as mood swings. Chronically stressed individuals may not efficiently convert phenylalanine to tyrosine, making supplementation with tyrosine desirable.

Tyrosine also serves as a precursor for the thyroid hormone thyroxine and melanin, the pigment responsible for skin and hair color and protection against harmful ultraviolet rays. In addition, tyrosine stimulates growth hormone and is involved in adrenal and pituitary function. Tyrosine is also a powerful antioxidant, scavenging and neutralizing free radicals and inhibiting fat oxidation

Suggested Use

Take 1 capsule three times daily or as recommended by your health-care practitioner

Other Ingredients

Hypromellose (derived from cellulose) capsule, leucine, silicon dioxide.


Tamper Evident: Use only if bottle is sealed.

Warning: If pregnant, nursing, or trying to conceive, consult your health-care practitioner before using this product.

Store tightly sealed in a cool, dry place.

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Supplement Facts
Serving Size: One Capsule
Each Capsule Contains: Amount Per Serving % DV
L-Tyrosine 500 mg *
*Daily Value (DV) not established.

iHerb Customer Reviews

5 Stars
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1 Stars

Excellent quality

Posted by Reviewer1706966 on Mar 21, 2011

Provides a noticeable mood boost. This is a must for anyone with thyroid/adrenal issues. One of the few supplements that actually works. Don't overdo it though. I've found that one capsule taken first thing in the morning on an empty stomach (1 hour before eating anything) is all I need. There is another product from Thorne called Thyrocsin which has l-tyrosine in it, but it was impossible for me to take it on an empty stomach due to nausea from some of the other ingredients.

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7 people found the following review helpful

Improves Dopamine

Posted by truevitality on Nov 12, 2012

L-Tyrosine,is a precursor to Dopamine a major neurotransmitter in the brain. Thorne is a brand I trust as it has no harmful excipients.

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2 people found the following review helpful

Great product

Posted by 5335608267849999773 on Sep 18, 2013

Thorne research is a good brand and tyrosine is like coffee for my add symptoms

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2 people found the following review helpful

very good product

Posted by Reviewer1276389 on May 19, 2010

I heard Thorne Research is the best brand there is, so I have decided to pay extra few bucks for the best. Taking it as my thyroid rutine every morning. Have no side effects what so ever from it and my thyroid definitely likes it as well.

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4 people found the following review helpful


Posted by 4625915390168235560 on Sep 21, 2013

Best L-tyrosine!

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1 person found the following review helpful

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