Basic Info:

  • Chemical Synonym(s): Benzenepropanethioic acid,S-phenyl ester; phenyl 4-phenylthiobutanoate; 3-Phenylpropionyl-phenyl-thioether; 3-Phenylthiopropionic acid,S-phenyl ester; S-Phenyl-3-phenylpropanthioat; Expand
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  • CAS Number: 63-91-2
  • Chemical Formula:


  • MSDS: Download


1.201 g/cm3
Boiling Point
307.5ºC at 760 mmHg
Melting Point
270-275ºC (dec.)(lit.)
Flash Point
White to off-white
5.0-7.0 (25℃, 0.1M in H2O)
Water Solubility
1-5 g/100 mL at 25 ºC
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We help you source L-Phenylalanine in China

Our Advantages:

We are currently dealing in lipoic acid, calcium gama-hydroxybutyrate and hyaluronic acid.

We have a great advantage in the supply chain of amino acids, a good amino acid plant needs to have fermentation advantages, high costs and barriers, and also high environmental requirements.

We know every amino acid plant in China and can provide you with the most accurate information.

We have a 20+ year track record of working with suppliers in China and rating reports on them, and we keep our suppliers updated with the latest news so our customers can get the latest supplier reports. We know the market well and have early warning notifications on upstream raw material prices to help you build a stable supply chain.

When selecting suppliers, our procurement specialists will audit the qualification of suppliers, conduct thorough investigations such as field visits and sample testing, and make ratings to ensure the authenticity and legality of supplier information.

We have a long-term stable cooperation with GLP laboratories, encounter customer test results and supplier test results do not match the situation, we will commission a third party to test to ensure the accuracy, authenticity and reliability of the experimental results. In this way, we can effectively control the product quality problems.

We have a long-term cooperative warehouse and can follow up packaging and labeling according to safety regulations and customer requirements. In order to effectively prevent damage to the goods in transit, we have prepared various reinforcement measures and packaging solutions.

We have a number of international freight companies with whom we have long-standing cooperation, and we can choose several route options according to the customer's requirements. For more difficult or urgent orders, we will prepare several alternative solutions to ensure safe and timely delivery.


We promise to immediately and unconditionally exchange or return the goods if they have quality problems. Our employees who deal with after-sales issues have many years of international work experience and are familiar with various processes in multinational work, so they can communicate and deal with after-sales issues without any obstacles.

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L-Phenylalanine is a naturally occurring amino acid. It is commonly called L-phenylalanine or simply phenylalanine.

  It is a derivative of phenylalanine, one of the 20 standard amino acids commonly found in proteins. It is an essential amino acid which means it cannot be produced by the body and must be obtained through diet.

It can find it in cheese, chicken, red meat, fish, and dairy products. It is a precursor of the neurotransmitters norepinephrine, epinephrine, and tyrosine. It is part of the chemical reaction that produces melanin from phenylalanine.

Its popularity stems from its mood-enhancing effects, which can be attributed to its ability to elevate levels of these neurotransmitters. It is also known as Phe.


L-Phenylalanine is found in many dietary supplements used by athletes to increase the body's naturally occurring proteins.

L-Phenylalanine is converted into L-Tyrosine, which then converts into L-DOPA, which in turn is converted into dopamine, norepinephrine, and epinephrine.

These are all molecules that are used by the body to produce proteins. Athletes are often recommended L-Phenylalanine to increase their body's natural level of these essential proteins. It works by the exact mechanism of the other drugs available for medical use.

It is used to treat different mood-related disorders, attention deficit hyperactivity disorder(ADHD), depression, schizophrenic symptoms, migraine, fibromyalgia, etc. It is also used to treat depression, lethargy, chronic pain, obsessive-compulsive disorder, obesity, and alcoholism.

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