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Table 5 Factors affecting the rate and synthesis of endogenously produced vitamin D

From: Plausible ergogenic effects of vitamin D on athletic performance and recovery

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