2,000 IU of vitamin D per day abolished the seasonality of influenza and dramatically reduced its self-reported incidence User 1345834, in the Everything Science subreddit, 05 Dec 2017
'Twenty-five years later, Aloia and Li-Ng found 2,000 IU of vitamin D per day abolished the seasonality of influenza'. User [deleted], in the Pandemic subreddit, 30 Apr 2009