The 8-page Guide to Vitamin D Deficiency addresses symptoms of low vitamin D. When sunshine is scarce, vitamin D levels in our bodies drop.
Low levels of this crucial vitamin can weaken immunity and we become more vulnerable to colds and the flu. A lack of vitamin D can also exacerbate joint and muscle pain, breathing difficulties and depression.
How much do you need? Should it be D2 or D3?
Learn the signs of vitamin D deficiency in children and adults and how to interpret blood test results. Find out how to correct vitamin D deficiency without overdosing, whether with sun exposure or supplements.
Avoid vitamin D toxicity from high-dose supplements.