3 - (methylselenyl) - L-alanine, also known as l-selenomethylselenocysteine, is commonly used as selenium nutritional enhancer. It is the twenty-first seleno methylation derivative of L-, which is an essential amino acid of human body. It is widely used in plants such as Astragalus, garlic, onion and broccoli, and selenium enriched yeast. It has the advantages of clear chemical structure, small toxicity, high bioavailability and good selenium supplement. It not only plays a preventive role in many kinds of tumors, such as breast cancer, prostate cancer, liver cancer, etc. It also plays an auxiliary role in cancer treatment and has broad application prospects.
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