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Description
The people who run into trouble are those who started closer to the lower end of normal, around 200-300 pg/mL, where even a modest decline pushes them into deficiency

however, in certain cases injections may be recommended following medical assessment.

iScience 26(1):105850

But a few patterns hold true across nearly every durable company in this space

Giovannoni et al., 2022)

Miller et al., 2006)