You have survived a winter when the sunshine is least and at a low angle. You were typically covered by head-to-toe clothing. As a result you used more Vitamin D than you stored. Hopefully you supplemented with Vitamin D3 to meet your body's diverse needs for Vitamin D. By April your body's store (level) of Vitamin D is at its lowest, even if your skin is young enough to still synthesize its own Vitamin D from its exposure to sunlight.
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