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Progesterone alone was 1.8 times more effective than placebo but vitamin D and progesterone had the greatest impact on recovery. Considering that up to 70% of the US population has inadequate vitamin D levels, this could pose an unfavorable outcome for many TBI patients.

Doses given: progesterone (1mg/kg body weight twice a day). vitamin D (5micrograms/kg body weight once per day).

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