Vitamin D from sunlight in Vietnam
How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 7 cities in Vietnam.
| City | Latitude | Elevation | Vitamin D winter |
|---|---|---|---|
| Ho Chi Minh City | 10.82°N | 7 m | none |
| Hanoi | 21.02°N | 10 m | none |
| Haiphong | 20.86°N | 12 m | none |
| Cần Thơ | 10.04°N | 3 m | none |
| Huế | 16.46°N | 8 m | none |
| Da Nang | 16.07°N | 11 m | none |
| Biên Hòa | 10.94°N | 6 m | none |
The same sun that makes vitamin D also burns. UV index and sunburn times in Vietnam →