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Less common side effects after the flu shot include: In rare cases, flu shots can cause more serious symptoms that require immediate attention

Retrieved 14 February 2026

Ive been taking the shot for about a month now and the results as far as energy and motivation to get things done is phenomenal

A COA documents third-party testing of the medication for: Identity (confirming the medication is what the label says) Potency (confirming the concentration matches the label) Sterility (confirming no microbial contamination) Endotoxin levels (confirming safety for injection) pH and stability If your pharmacy cannot or will not provide a COA, consider whether you are comfortable using their products

Hb Five studies comprising 3730 patients reported Hb