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If you’re one of the approximately 75% of Americans who are deficient in vitamin D, look no further. Doctor’s Best?Vitamin D3 is a “sunshine vitamin” needed to maintain strong bones and teeth and provide optimal immune function.* If you are not spending a lot of time in the sun or eating certain foods like fatty fish, fortified milk or eggs, you’re likely deficient in vitamin D. It’s totally normal–most people supplement to maintain adequate D3 levels–and it’s an easy fix with our array of vitamin D3 products.*