Meeting Vitamin D needs through sunlight alone can be challenging, particularly for those following dairy-free diets who may have limited dietary sources. The amount of sunlight needed depends on several factors, including geographical location, time of year, time of day, skin pigmentation, age, and use of sunscreen.
As a general guideline, about 10 to 30 minutes of midday sun exposure on the face, arms, and legs twice a week can help achieve sufficient Vitamin D synthesis. However, because of the risk of skin damage and cancer from sun exposure, it's recommended to get Vitamin D from dietary sources or supplements and to use sun protection during prolonged sun exposure.