1000-2000IU on average per day for an adult, depending on your size. You add this up and take it instead every 2-3 days likely without any issues (e.g. I take 3000-4000IU every 2-3days)
If you have lighter toned skin and get regular sun exposure you may not need any supplementation
What would be the appropriate dose of Vitamin D?
The large effects on children is an odd example (poor example?) to point at since children have been reported to have the least harm from COVID-19.
1000-2000IU on average per day for an adult, depending on your size. You add this up and take it instead every 2-3 days likely without any issues (e.g. I take 3000-4000IU every 2-3days)
If you have lighter toned skin and get regular sun exposure you may not need any supplementation