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FDA cited the lack of adequate safety and efficacy data, the absence of an approved application, and insufficient evidence of a clinical need that could not be met by an approved product

People Taking Certain Medications Some commonly prescribed medications can deplete B12 over time

See [expected results timeline](/guides/semaglutide-weight-loss-results-timeline-what-to-expect)

If you can control your diet but want to maximize fat loss efficiency, AOD 9604 is excellent

Two are FDA-approved specifically as injectable weight loss medications: Saxenda (liraglutide) approved in 2014, injected once daily

Structurally a close cousin of GHK-Cu, AHK-Cu has become a focused subject of preclinical investigation, particularly in studies relating to hair follicle biology, dermal cell research, and copper-mediated signalling pathways