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You should not take B12 injections if you are allergic to vitamin B12 or cobalt or if you have Lebers disease[18], a rare genetic condition that can lead to optic nerve damage and vision loss
There are no documented pharmacological interactions between Retatrutide and GHK-Cu
FDA.gov (2026) 11
[7] Improved body composition: From a fitness perspective, reducing subcutaneous fat can help reveal muscle definition and improve overall body composition, which are important factors for bodybuilders and fitness enthusiasts
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