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NHS treatment guidance describes a loading course followed by maintenance injections every two to three months for many people, while a diet-related deficiency may need less

This really lays out the core differences at a glance

Some therapies are discussed for body composition, but preserving muscle still depends heavily on protein intake, resistance training, recovery, and avoiding an overly aggressive calorie deficit.

This table makes it clear: while they share a core function, their specialties differ

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