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This does not make it the most effective, which remains debated, but it does make it among the best characterized for safety

ONeill MS, Kinney PL, Cohen AJ (2008) Environmental equity in air quality management: local and international implications for human health and climate change

There are ranges that one could work within, and Ill share below, however, there are many variables to work with (weight, age, hormones, other RXs, peptides, underlying conditions, etc.) to consider

Shoulder (rotator cuff, labrum): Inject subcutaneously over the lateral deltoid, approximately 1 inch from the point of maximum tenderness