However, it is unclear whether this has any health consequences. People with darker skin tones generate vitamin D from the sun more slowly than people with lighter skin.
People with dark skin: Dark skin tones contain more melanin, which can reduce the amount of vitamin D the skin makes. Also, the skin’s ability to synthesize vitamin D declines with age. According to the NIH, around half of older adults with hip fractures in the United States may have inadequate vitamin D levels. Older adults: Older adults who spend a lot of time indoors may be at risk of developing a vitamin D deficiency. People who live in colder climates may also get less sunlight exposure during the winter months. 
People who get less exposure to sunlight: People who cannot leave the house, work night shifts, or cover their skin for religious reasons may not get the sun exposure that the body needs to create enough vitamin D.
The NIH reports that exclusively and partially breastfed infants receive 10 micrograms (mcg), or 400 international units (IU), of vitamin D per day until weaning.
Infants drinking breast milk: This does not contain much vitamin D. According to the National Institutes for Health (NIH), these groups can include: Some people are more at risk of developing a vitamin D deficiency. Vitamin D is a fat-soluble vitamin essential for healthy bones, immune function, and cell growth.
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