IGF-1 LR3: Fitness and bodybuilding IGF-1 LR3, or Long Argine 3-IGF-1, is a synthetic analog of human insulin-like growth factor 1 (IGF-1) that has gained popularity in the fitness and bodybuilding communities. The primary function of IGF-1 LR3 is to promote anabolic processes, making it a powerful tool for muscle growth and recovery. It works by increasing the levels of insulin-like growth factor in the body, which stimulates muscle cell proliferation and differentiation.
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