Either you do an lab test of
vitamin d3 or if you have any history of fatigue body pain esp. during early morning.
vitamin d3 level- less than 20ng/dl is considered deficiency and between 21ng-to 30ng/dl-considered as insufficiency
its given in the form of granules or tablets of 60000IU strength -once in week for at least 15 weeks .it should be taken with
calcium supplement
It helps in absorption calcium to maintain body calcium and phosphate level ,helps in recusing risk of heart disease
Next Steps
morning exposure to sunlight up to 30 minutes a day is excellent source