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IGF-1 LR3, often referred to as Long R3 Insulin-like Growth Factor-1, is a synthetic and modified version of Insulin-like Growth Factor-1 (IGF-1), a natural peptide hormone found in the human body. IGF-1 is closely related to insulin and plays a significant role in cell growth, development, and repair.

Here are some key points about IGF-1 LR3:

1. Chemical Modification: IGF-1 LR3 is modified from the naturally occurring IGF-1 by the replacement of the Glutamic Acid (E) at position 3 with an Arginine (R). This modification extends its half-life in the body, making it more stable and active.
2. Biological Function: IGF-1 LR3 has a higher potency and a longer duration of action compared to regular IGF-1. It binds to the IGF-1 receptor with greater affinity and is less susceptible to binding proteins that can limit its activity.
3. Muscle Growth and Repair: IGF-1 LR3 is often associated with its potential to stimulate muscle growth and repair. It promotes the growth of muscle cells (muscle hypertrophy) and enhances the recovery of damaged muscle tissues.
4. Performance Enhancement: Due to its muscle-building properties, some athletes and bodybuilders have used IGF-1 LR3 as a performance-enhancing substance. It is considered a prohibited substance by many sports organizations.
5. Research and Medicine: IGF-1 LR3 is also used in laboratory research to study cell growth and differentiation. Additionally, it has been explored as a potential therapeutic agent for conditions associated with muscle wasting or poor growth, although its use in clinical settings remains limited and highly regulated.

It’s important to note that the use of IGF-1 LR3 for non-medical or non-scientific purposes can have serious health risks and may be illegal in some jurisdictions. Its use should always be under the guidance of qualified medical professionals and in compliance with relevant regulations.