Tendons connect muscle to bone. Ligaments.. bone to bone.
Glucosamine is a glycosylated proteins and lipids. A type of glucosamine forms chitin... beneficial as a precursor for glycosaminoglycans/glycosaminoglycans which are a major component of joint cartilage... supplemental glucosamine may help to rebuild cartilage and treat arthritis.
Nothing to do with the Rotator Cuff (Subscapularis, teres minor, infraspinatus and supraspinatus muscles)
So I say again... rest, a non-steroidal anti inflammatory if prescribed from a physician and post-surgical rehab which will include physical therapy to ensure adequate usage and strengthening.
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