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For a complete injection tutorial including site rotation and technique see our [semaglutide injection guide](/guides/semaglutide-injection-sites-abdomen-thigh-arm)
FDA nonclinical toxicology review (2023-2024) flagged DNA damage in pituitary cells and injection-site necrosis in animal studies, plus immunogenicity and impurity risks from compounded material, alongside GH/IGF-1-axis effects such as fluid retention, joint discomfort, flushing, and headache reported by users
Yes, taking both is generally safe as B vitamins are water-soluble, but you may receive excessive amounts of certain vitamins, particularly B6 and niacin
Yes, B12 injections can have side effects, although they are generally rare and mild
More injections per session, but full dose control over each compound
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