I have multivitamin pill. We've all been taking them. I'm in a very poor area of Issan and unfortunately it's really hard to find descent vegetables, fruit, etc. Also it makes me feel I'm covering the bases. Perhaps even a placebo effect is good.
Interesting enough a half hour of sun is 10,000 to 20,000 IU of vitamin D. The recommended daily intake is 600 IU.
"Another study found that 30 minutes of midday summer sun exposure in Oslo, Norway was equivalent to consuming 10,000–20,000 IU of vitamin D (8Trusted Source)."
https://www.healthline.com/nutrition/vitamin-d-from-sun#time-of-day