Hot supply 99% L-Methionine CAS 63-68-3 in stock

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Products Description

Name: L-Methionine powder

Cas: 63-68-3

Purity: 99%min


Basic Info:

CAS No.:






Stock Availability

In stock

Brand Name

Look chem




Product Introduction:

Methionine is a sulfur-containing non-polar aliphatic amino acid, also known as methionine. It is one of the essential amino acids for the human body. It is abbreviated as Met and M.

Methionine is widely used in nutritional supplements and livestock feeds. Methionine is easily absorbed by chickens and converted into chicken protein. Adding methionine to chicken feeds can reduce feed consumption and make chickens grow healthy.

At present, there are four main types of methionine: solid methionine, liquid hydroxymethionine (MHA), liquid sodium methionine and solid calcium hydroxymethionine. Among them, solid methionine has the largest market. .

But in the US methionine market, liquid hydroxymethionine (MHA) is the largest. Methionine is produced by ribosomal translation from the start codon (nitrogen-containing base sequence AUG) on mRNA in the human body.

L-methionine properties:

  • Melting point: 284°C(dec.)(lit.)
  • Specific optical rotation: 23.25º(c=2,6NHCl)
  • Boiling point: 393.91°C(estimate)
  • Density: 1,34g/cm
  • Refractive index: 1.5216(estimate)
  • Storage conditions: 20-25°C
  • Solubility: 1MHCl:0.5Mat20°C,clear,colorless
  • Form: Solid
  • Acidity coefficient: (pKa)2.13(at25℃)
  • Color: White
  • PH value: 5-7(10g/l,H2O,20℃)


Product NameL-Methionine powder
CAS No.63-68-3
Appearance White powder
Content99% min
Shelf Life2 years
Packing1kg/bag,25kg/bag or as your requirements

Stability of L-methionine:

  1. This product is non-toxic and can be used as a feed additive. However, it is reported that large amounts of this product can cause symptoms such as vomiting and loss of appetite. For rats, intraperitoneal injection, L type: LD50 is 29mmol/kg; D type: LD50 is 35mmol/kg.
    Special attention should be paid to the use of highly toxic raw material sodium cyanide in the production process of methionine. Therefore, the production workshop should take corresponding measures in accordance with the sodium cyanide toxicity protection requirements: equipment should be closed, the production site should be well ventilated, and operators should wear protection Supplies etc.
  2. Exist in burley tobacco leaves.

References: Wikipedia

The function and role of L-Methionine:

  1. Used as a feed nutrient fortifier
    • L-methionine is mainly used as a feed nutrition enhancer. It is one of the essential amino acids for animal growth. It is the “skeleton” amino acid for protein biosynthesis. It is the main donor of methyl groups in animals. It plays a certain role in the synthesis of choline and phospholipids in liver fat by adrenaline in the metabolic process of animals. The lack of methionine in livestock and poultry can cause stunted growth, weight loss, weakened liver and kidney functions, muscle atrophy, and fur deterioration.
  2. Used as an intensifier for protein feed
    • L-methionine is a sulfur-containing amino acid and is the second essential limiting amino acid for pigs. If lysine and methionine are properly added to the feed, it can effectively improve the utilization rate of feed protein. Therefore, lysine and methionine are called protein feed enhancers.
  3. Used as a catalyst
    • L-methionine plays an important role in the metabolism of the body. But its concentration in the body is not high. Although methionine is also easy to penetrate the blood-brain barrier, its concentration in the brain is lower than that of glutamic acid, glutamine, aspartic acid, alanine, glycine, serine and cattle. The concentration of sulfonic acid in the cerebrospinal fluid is not high, and the concentration of L-methionine in muscle tissue is lower than the average value of other amino acids.
  4. It is also a more effective antidepressant drug
    • Adenosylmethionine can also be used as a methyl donor, similar to the methylation reaction of L-methionine. Methylation causes normal brain components to become hallucinogenic substances. Therefore, hypermethylation will involve schizophrenia, psychosis, depression and mental related diseases. Conversely, lack of methylation can be related to depression.
  5. Antioxidant and antidote
    • It is transformed from L-methionine into cysteine, glutathione, and taurine, becoming the most powerful antioxidant and antidote for the human body. Methionine is also considered an amino acid that promotes the increase of all amino acid levels in the body. At the same time, it also promotes the absorption and transmission of important minerals of selenium and zinc, and the formation of choline; it is a member of the vitamin B family and lecithin, and is an important substance for the formation of acetylcholine as a neurotransmitter.


Pre-Sales Service

* Quick response and 24 hours online, the professional team will provide you with the most favorable prices and high-quality products.

* Support test samples.

* Every batch of products will undergo strict quality inspection.

* Packaging can also be done according to customer requirements.

* Any inquiry will be answered within 24 hours.

* We provide commercial invoice, packing list, bill of lading, certificate of authenticity, health certificate and certificate of origin. If your market has special requirements, please let us know.


After-Sales Service

* Logistics information monitoring facts.

* You can consult at any time if you have any questions about the product.

* If there is any problem with the product, we all support the return.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.


Do you accept sample order?

We will make samples before mass production, and after the samples are approved, we will start mass production. 100% inspection during production and random inspection before packaging.


You can get samples of some products for free, you only need to pay the freight or order express delivery and take samples. You can send us your specifications and wishes, and we will manufacture products according to your requirements.

What’s your MOQ?

Our MOQ is 1 kg. But we can usually accept smaller quantities, such as 100 grams, provided that the sample fee is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.

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