Basic premise:
Take D3 instead of D2
You don't need to take it every day. You can take the whole week's worth of D3 once a week i.e. instead of taking 2,000 iu each day take 14,000 iu once a week say at the weekend.
Better to take weekly rather than monthly doses if you are thinking of using this method due to Vit D's half life. Also there is the practicality of say taking 30 day's worth all at once.
BTW in the video he speaks about D3 coming in doses of 2,000. Actually you can now get doses of 5,000 iu and 10,000 iu softgels, so you only need take 2-3 of each every week
Yes I take a 10000 IU once a week. Since the time I have started taking I can see a lot of difference in my energy levels. It helps