ICU patients greatly helped by Vitamin D loading doses β if gut-friendly
Meta-analysis on this page of all forms of Vitamin D did not find any benefit to ICU patients. ICU patients often have poor digestive systems, and so respond best to gut-friendly Vitamin D.
I have highlighted those gut-friendly RCTs using Vitamin D

Gut-friendly forms include:
Injection
IV
Topical
Emulsions
Mucous membranes in the mouth
Vaginal
Overview Gut and vitamin D contains gut-friendly information
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Vitamin D supplementation and the outcomes of critically ill adult patients: a systematic review and meta-analysis of randomized controlled trials β Oct 2020
SCIENTIFIC REPORTS natureresearch
Shao-Huan LanοΌ7, Chih-Cheng Lai,7, Shen-Peng Chang, Li-Chin Lu, Shun-Hsing Hung* & Wei-Ting Lin*