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If your levels were very low, this early phase can feel especially noticeable

To counter this constant evolution, seasonal vaccines are redesigned annually on predictions of what will be the dominant circulating variants in the upcoming flu season. Predictions must be made significantly ahead of time owing to the time needed to manufacture sufficient doses of vaccine, which can lead to mismatches between vaccine and circulating strains that almost universally lead to limited efficacy

In fact, the only thing most patients will say is they regret not supplementing with it sooner!

You can always count on them to make you feel better