Description L-Methionine quick Details Chemical Name: L-Methionine CAS No.: 63-68-3 Molecular Formula: C5H11NO2S L-MethionineStructure: Molecular weight:149.21 Appearance: white powder Assay: ≥98.5% L-Methioninetypical Properties Item Specifications Identification Conforms Assay 98.5%~101.5% Specifc Rotation 22.4º~ 24.7º pH 5.6~6.1 Heavy metals (Pb) ≤0.0015% Iron(Fe) ≤0.003% Sulfate (SO4) ≤0.03% Chloride(Cl) ≤0.05% Loss on drying ≤0.3% Residue on ignition ≤0.4% L-Methionine Usage 1. Amino acid drugs, nutritional supplements. For cirrhosis and fatty liver. 2. In addition, it is used in large quantities as a feed additive to improve feed quality, increase the utilization of natural proteins and promote animal development. 3. For example, DL-methionine can increase the egg production of the chicken, increase the weight of the pig, and produce more milk for the cow. Adverse reactions: hepatic coma L-MethioninePackaging and Shipping Packaging Details: 25kg/drum Port: Shanghai or other China port L-MethionineStorage This product is transported according to general chemical products, pay attention to rain, moisture, and store in dry and ventilated place.

L-Methionine CAS 63-68-3

MET, Promotion Season Now in Store and Free Sample for Testing with Factory Price

Chemical Name: L-Methionine

CAS No.:63-68-3

Molecular Fomula:C5H11NO2S

Molecular weight:149.21

Appearance:White Solid

Sample: Available

L-Methionine CAS#63-68-3

Description of L-Methionine

MET is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH3+ form under biological conditions), an α-carboxylic acid group (which is in the deprotonated −COO− form under biological conditions), and an S-methyl thioether side chain, classifying it as a non-polar, aliphatic amino acid. It is essential in humans, meaning the body cannot synthesize it and thus it must be obtained from the diet.
Methionine is coded for by the initiation codon meaning it indicates the start of the coding region and is the first amino acid produced in a nascent polypeptide during mRNA translation.

Basic Info of L-Methionine

Chemical Name



S-methionine;L-Methionine;L-Methionyl b-naphthylamide;Met-bNA;N-L-Methionyl-2-naphthylamine;Expand



Molecular Formula


Molecular Weight






Safety Info



Safety Statements


HS Code


WGK Germany


Risk Statements



Appearance & Physical State

White crystalline powder


1.206 g/cm3

Boiling Point

306.9ºC at 760 mmHg

Melting Point

276-279ºC (dec.)

Flash Point


Water Solubility



Stable. Incompatible with strong oxidizing agents.

Storage Condition

Store at RT.

Numbering system

MDL number


Share on facebook
Share on twitter
Share on linkedin

What is L-Methionine?

  • With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. 
  • One such product is MET which has developed particularly rapidly in recent years. Do you know about MET?
  • The official answer:L-methionine, also known as MET, is the levorotatory form of methionine, with the chemical formula C5H11NO2S. Melting point 280-281℃. It is unstable to strong acids and can lead to demethylation.

What’s the application of L-Methionine?

Amino acid medicine, nutritional supplements. Used for hepatic steatosis and fatty liver. It is also used in large quantities as a feed additive to improve the quality of feed, increase the utilization of natural proteins Chemicalbook rate and promote the development of animals. For example, DL-methionine can increase the egg production of chickens, increase the weight of pigs and increase milk production of cows. Adverse effects: contraindicated in hepatic coma.


Sincere to the customer and in good faith of quality is our forever followed motto. It’s the basement to be a human and do business. We take all responsibility for our products and service sincerely. We are a company integrating R&D, production, and sales. The design, research, and development of pharmaceutical intermediates include more than 330 kinds of pharmaceutical intermediates such as Anti-infectives, Cardiovascular and Cerebrovascular Systems, Digestive systems, Santi-tumor, Nervous systems, Geriatric Drugs, and Gynecological Drugs. At the same time, we have more than 4,000 factories in strategic cooperation with nearly 50,000 chemical products, so we can provide you with a one-stop purchasing service, which greatly saves customers’ procurement costs and time.

Hello, I’m Pew Ni, the chemical products one-stop solution expert.

Hi, I‘m Peter Ni, the founder of Sincere-Chem, I’ve been running a company in China that exporting chemicals, pharmaceuticals, and intermediates for over 70 countries now. And a range of 50,000 products with the best quality and competitive price to meet your different purchasing needs.

CEO Email:

CEO Phone Number:
+86-188-6575 9396

CEO WhatsApp:
+86-188-6575 9396

Request A Free Quote

Keywords of L-Methionine

MET,63-68-3, buy MET, MET supplier, purchase MET, MET cost, MET manufacturer, order MET, high purity MET


United Kingdom Giles
United Kingdom Giles
Read More
Peter has been my partner for many years, we met at the Shanghai CPHI Fair in 2014, for the first time I didn't have much interest in Peter's products because our company had a stable supplier. Although we didn't work together, Peter would often send me important news and interesting trend information about the industry, so we became good friends, even though I didn't place any orders with him during this time, even if it was a sample order. In September 2016, our original supplier was unable to provide us with the quality and delivery guarantees we needed, so I first thought of Peter and his company. Until now, we have maintained a very good personal friendship in addition to a steady business relationship.
India Shikhar
India Shikhar
Read More
In all my years of sourcing from China, I first time to found that working with Sincere Chemical was so good, they helped me with all the production and delivery as well as a lot of technical expertise, which saved me a lot of time. When I first approached Peter for a quotation for Optical Brightener, he made me a detailed quotation with not only prices but also foreign trade details, company profile, company strengths, R&D capabilities, production capacity, packaging methods, raw material control, environmental protection, and much more. This information was a very important reference for me in making purchasing decisions. Sincere Chemical is a trustworthy supplier and I believe our business will grow from strength to strength!
Korea Kim
Korea Kim
Read More
Hi, I'm Kim, I'm Peter's partner and although I don't like him very much (because he never gives me more money for my prices, hahaha) I'm still willing to write him customer feedback. As an international buyer, I have to deal with a lot of things every day and my inbox is often full of development letters. It's a lot of junk and meaningless pleasantries, which I don't like that much, but Peter's emails always give me a better understanding of the product and the industry. I am also very pleased with his work ethic, and I am very happy with his work every time I work with him, not only in providing quotations but also in facilitating all the details of my work so that I can concentrate more on other things, so he is the best supplier for me. Although his prices are not the lowest among all suppliers, his products give me the greatest peace of mind.
USA Franklin
USA Franklin
Read More
Sincere Chemical team visited our USA factory in the year of 2017. We think highly of cooperation with them. We thanked you for the past excellent orders and best product quality. We also talked about some new products for future orders. We will be still in strategic cooperation in the future and help each other.
Canada Kate
Canada Kate
Read More
I just got the product. The quality is awesome. I’m very happy. Hope to place soon a new order in your company. Also wish for our future business.
Read More
Sincere Chemical is a reliable and professional company. Not only on exporting but also their professional team service. Their team gave us so many suggestions for our new project. We are really satisfied with their awesome service and best product quality. Sincere-Chem’s vendor code is 51465768 in our cooperated vendor list system.
Read More
I have visited Sincere Chemical company in the year 2018. Their company can be considered as one of the most professional, customer-focused, and product quality-driven companies that I have worked with in recent years.
Brazil Aline
Brazil Aline
Read More
We are a pharmaceutical products manufacturer in Brazil. I’m happy to cooperate with Sincere Chemical especially cooperate with Peter. Peter is patient and friendly. I’m satisfied with his 24*7 hours service. We are not only cooperators but also best friends with each other.
Mexico Gonzalo
Mexico Gonzalo
Read More
Great service and very supportive. This is my first order and I feel fortunate to be with Peter and his company. Product received was the right good quality product, so my review is more related with the quality, service and shipment. Thank you for sending. next time I will order again. Good supplier...