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Factors affecting the rate and synthesis of endogenously produced vitamin D
| Seasonal Variations in UVB Exposure |
| Living at Latitudes (~32-42° N or S) That Are Further Away From The Equator |
| Higher Altitudes |
| Cloudy Climates |
| Thick Ozone Layers due to Pollution |
| Darker Skin Pigmentation (higher melanin [natural sun-block] levels) |
| Higher Adipose Tissue (obesity) |
| Older Age |
| Utilization of Sun-block |
