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Studies suggest that it: Promotes fat breakdown by activating beta-3 adrenergic receptors, leading to the release of fatty acids

[7] In practice, some protocols use 1 mg IM monthly for maintenance once levels are stabilized

Others experience it as a loss of pleasure or mild emotional flatness around food. Trial mood scores moved slightly better rather than worse, so the negative experience appears to be a minority signal that standard adverse-event tables do not capture well

From there your provider suggests a plan, which may include shots, medication, or both, plus simple nutrition guidance

doi:10.1016/j.bmcl.2018.07.009

Treatment depends on the cause and severity of the deficiency