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Anti-Doping Agency education article

According to the Wegovy label, fatigue occurs in approximately 11% of patients versus placebo, while Saxenda reports fatigue in 5-9% of patients

Gajecki D, Gawry J, Szahidewicz-Krupska E, Doroszko A

Potential side effects may include injection-site redness, swelling, bruising, itching, tenderness, small lumps, headache, fatigue, nausea, appetite changes, abdominal discomfort, stool changes, dizziness, altered sleep, mood changes, or feeling off. Allergic or immune reactions are also possible, and the FDA has specifically raised concerns about immunogenicity and peptide-related impurities in compounded BPC-157

Vitamin B12 deficiency can be caused by not getting enough of it, problems with absorbing it, or taking a medication that interferes with its absorption.