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L-Isoleucine is an essential amino acid with the molecular formula C6H13NO2. It is one of the 20 standard amino acids that are the building blocks of proteins.

Here are some key points about L-Isoleucine:

Amino acid: L-Isoleucine is classified as an essential amino acid, which means it cannot be synthesized by the human body and must be obtained through the diet. It is one of the three branched-chain amino acids (BCAAs), along with L-leucine and L-valine.
Structure and properties: L-Isoleucine has a branched aliphatic side chain. Its chemical structure includes a central alpha carbon bonded to an amino group, a carboxyl group, a hydrogen atom, and a side chain consisting of a methyl group attached to the second carbon of the main chain.
Biological functions: L-Isoleucine plays important roles in protein synthesis, muscle metabolism, and energy production. It is involved in promoting muscle recovery and growth, regulating blood sugar levels, and supporting immune function.
Dietary sources: L-Isoleucine is found in various dietary sources, particularly in protein-rich foods. Good sources include meat, poultry, fish, eggs, dairy products, legumes, nuts, and seeds. It is also available as a dietary supplement in the form of capsules, powders, or BCAA blends.
Athletic performance: L-Isoleucine, along with the other BCAAs, is often used by athletes and fitness enthusiasts to support muscle recovery, reduce muscle soreness, and improve exercise performance. It is believed to help prevent muscle breakdown during intense physical activity.
Safety considerations: L-Isoleucine is generally considered safe when consumed as part of a balanced diet or when taken in appropriate doses as a supplement. However, it is important to follow recommended dosage guidelines and consult a healthcare professional before starting any new supplementation regimen.