Weak sunlight before 9.00 16.00 clock clock and after 10-15 minutes per day for a long time (20 minutes should be khetopun or cold) helps the body create vitamin D sufficient.
The sun light Ajarn after 16.00 o'clock and clock time per day 10 - 15 minutes (the warm or cold should be 20 minutes) can help your body make Vitamin D D enough.