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by SamBam 2114 days ago
oral Calcidefiol is significantly more potent than vitamin D3, and is a faster way to boost blood Calcidefiol, which is the purpose of ingesting vitamin D.

I assume that the researchers picked it (1) to increase the chances of seeing a significant effect, if there is one, and (2) because if hours are at stake in saving a person's life, the fastest boost may be needed.