This product is a white to off-white crystalline powder, CAS 59-51-8, manufactured through a patented petrochemical process. Supplied in original 25 kg bags, it has a shelf life of 5 years when stored in a cool, dry place. It is the most widely used single amino acid additive in poultry and aquaculture feeds. As the “first limiting amino acid” for poultry and aquatic species, it specifically corrects the natural methionine deficiency in corn-soybean meal diets. Adding just 0.5–2 kg per tonne of compound feed can: promote protein synthesis, maximize growth rate and muscle deposition, improve broiler feather quality, egg weight and selenium content in layers, and reduce drip loss and feed conversion ratio; in aquaculture, it boosts feed conversion efficiency and disease resistance; in swine and ruminants, it increases piglet survival rate, raises milk selenium content, and reduces reproductive issues such as retained placenta. Industry classic benchmark —Adding 1 kg of methionine to feed provides nutritional value roughly equivalent to 50 kg of fishmeal, which can significantly replace high-cost protein ingredients, lower formula costs, and is the standard product for farms and feed mills to control costs and improve efficiency.